CN104168190B - A kind of method and device for calling routing - Google Patents

Abstract

The embodiment of the present invention provides a call routing method and device, which relate to the field of communication technology, to use the IMS network to bear the traffic, and to solve the problem that the way of using the PSTN long-distance network to bear the traffic is not conducive to network upgrading and energy saving and emission reduction. . The method includes: receiving a call request sent by a calling user through a call processing network element of a non-IMS network, obtaining the area code of the place where the number of the calling user belongs to, determining whether the first IMS network is configured in the place where the number of the calling user belongs, and whether Support the routing method of entering the IMS network nearby and leaving the IMS network far away; if the first IMS network is configured in the home of the calling party number and supports the routing method, the call request will be routed to the call of the first IMS network The processing network element enables the call processing network element of the first IMS network to route the call request.

Description

A call routing method and device

technical field

The present invention relates to the technical field of communications, in particular to a call routing method and device.

Background technique

The IP Multimedia Subsystem (IMS) network is an IP-based network architecture defined by The 3rd Generation Partnership Project (3GPP), and its core feature is the use of Session Initiation Protocol ( Session Initiation Protocol, referred to as SIP) and has nothing to do with the access technology, that is, the IMS network can realize the connection with the traditional circuit switched (Circuit Switched, referred to as CS) network through the media gateway control function (Media Gateway Control Function, referred to as MGCF) network elements, Such as public switched telephone network (Public Switched Telephone Network, referred to as PSTN) or mobile network intercommunication.

In the prior art, a process in which a CS network user makes a voice call to an IMS network user is shown in FIG. 1 . Assuming that the calling party is a PSTN network user in Shanghai and the called party is an IMS network user in Beijing, after the PSTN user on the calling side initiates a call, the call will be routed to the PSTN end office on the calling side, and the PSTN exchange on the calling side The receiving office receives the call and routes it to the PSTN toll office, and then routes the call to the I-CSCF network element of the called side through the MGCF network element of the called side IMS network, and the called side I-CSCF network element queries The ENUM/DNS server in the province to which the called side belongs obtains the S-CSCF network element that provides services for the user, and then routes it to the called user through the SBC network element on the called side to complete the entire call process.

When the PSTN network user communicates with the IMS network user, the call request sent by the calling user is routed from the PSTN network to the IMS network through the PSTN long-distance network, and the PSTN long-distance network is used to carry the traffic, that is, the "just far into the IMS network" is adopted. At the same time, when the traditional PSTN network users communicate with PSTN network users, the PSTN long-distance network is also used to bear the traffic. At present, the PSTN long-distance network mainly uses Time Division Multiplexing (TDM) equipment. The equipment has a long network time, high energy consumption, large floor space, and high failure rate. Therefore, using the PSTN long-distance network to carry traffic is not conducive to network upgrading and energy saving and emission reduction.

Contents of the invention

Embodiments of the present invention provide a call routing method and device to use the IMS network for traffic bearing, and solve the problem that using the PSTN long-distance network to bear the traffic is not conducive to network upgrading and energy saving and emission reduction.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a call routing method, including:

The call processing network element of the non-IMS network receives the call request sent by the calling user, and the call request includes the calling user number;

Obtain the area code of the place where the calling party number is located;

According to the area code of the place where the calling party number is located, determine whether the home area where the calling party number is located is configured with a first IMS network, and whether the first IMS network supports access to the IMS network that is nearby and exits the IMS network that is far away routing method;

If the first IMS network is configured in the home location of the calling party number, and the first IMS network supports the routing method, routing the call request to a call processing network element of the first IMS network , so that the call processing network element of the first IMS network routes the call request.

In a second aspect, an embodiment of the present invention provides a call routing method, including:

The call processing network element of the first IMS network receives the call request sent by the call processing network element of the non-IMS network, and the call request includes the called user number;

Obtaining the area code of the place where the called user number is located;

According to the area code of the home area where the called user number is located, determine whether the home area where the called user number is located is configured with a second IMS network and whether the second IMS network supports the route of entering the IMS network at the nearest location and leaving the IMS network at the far end Way;

If the second IMS network is configured at the home location of the called user number and the second IMS network supports the routing mode, then acquire the IP address of the call processing network element of the second IMS network;

Routing the call request to the call processing network element of the second IMS network according to the IP address of the call processing network element of the second IMS network, so that the call processing network element of the second IMS network can Call requests are routed.

In a third aspect, an embodiment of the present invention provides a call routing method, including:

The call processing network element of the second IMS network receives the call request sent by the call processing network element of the first IMS network, and the call request includes the called user number;

sending a first query request to the ENUM server of the second IMS network, so that the ENUM server of the second IMS network queries whether the SIP URI containing the called user number is inquired according to the first query request, and queries The result is sent to the call processing network element of the second IMS network, and the first query request includes the called user number;

receiving the query result sent by the ENUM server of the second IMS network;

If the query result includes the SIP URI of the called user number, then send a second query request to the home subscriber server HSS of the second IMS network; receive the Information about the SCSCF network element corresponding to the called user number; routing the call request to the SCSCF network element corresponding to the called user number, so that the SCSCF will call request routing to said called user;

If the query result does not contain the SIP URI of the called user number, then according to the called user number, route the call request to the called user.

In a fourth aspect, an embodiment of the present invention provides a call routing device, including:

a receiving unit, configured to receive a call request sent by a calling user, where the call request includes a calling user number;

an obtaining unit, configured to obtain the area code of the place where the calling party number belongs;

A determining unit, configured to determine whether the calling subscriber number is configured with a first IMS network based on the area code of the calling subscriber number's home zone, and whether the first IMS network supports access to the nearest IMS network, Outgoing routing mode of the IMS network; the determining unit is also used to determine whether the home location of the called user number is configured with a second IMS network according to the area code of the home location of the called user number, and the second Whether the IMS network supports the routing method;

A routing unit, configured to route the call request to the first IMS network if the first IMS network is configured in the home location of the calling party number and the first IMS network supports the routing mode The call processing network element of the first IMS network, so that the call processing network element of the first IMS network routes the call request.

In a fifth aspect, an embodiment of the present invention provides a call routing device, including:

A receiving unit, configured to receive a call request sent by a call processing network element of a non-IMS network, where the call request includes a called user number;

an obtaining unit, configured to obtain the area code of the place where the called user number belongs;

The determining unit is configured to determine whether the home area where the called user number is located is configured with a second IMS network and whether the second IMS network supports nearby IMS network access and remote access according to the area code of the home area where the called user number is located. Outgoing routing mode of the IMS network;

The obtaining unit is further configured to obtain the call processing network of the second IMS network if the second IMS network is configured in the home location of the called user number and the second IMS network supports the routing mode. Yuan's IP address;

a routing unit, configured to route the call request to the call processing network element of the second IMS network according to the IP address of the call processing network element of the second IMS network, so that the call processing of the second IMS network The network element routes the call request.

In a sixth aspect, an embodiment of the present invention provides a call routing device, including:

A receiving unit, configured to receive a call request sent by a call processing network element of the first IMS network, where the call request includes a called user number;

A sending unit, configured to send a first query request to the ENUM server of the second IMS network, so that the ENUM server of the second IMS network queries whether the SIPURI containing the called user number is included according to the first query request. and sending the query result to the call processing network element of the second IMS network, where the first query request includes the called user number;

The receiving unit is further configured to receive the query result sent by the ENUM server of the second IMS network;

a routing unit, configured to send a second query request to the home subscriber server HSS of the second IMS network if the query result contains the SIP URI of the called user number; the receiving unit receives Information about the SCSCF network element corresponding to the called user number sent by the HSS server of the second IMS network; routing the call request to the SCSCF network element corresponding to the called user number , so that the serving call session control function routes the call request to the called user;

The routing unit is further configured to pass the call request through the media gateway of the second IMS network according to the called user number if the query result does not include the SIP URI of the called user number The control function network element routes to the called user.

In the call routing method and device provided by the embodiments of the present invention, the call processing network element of the non-IMS network receives the call request sent by the calling user, obtains the area code of the place where the calling user's number belongs, and determines the calling user's number. Whether the first IMS network is configured in the location, and whether it supports the routing method of entering the IMS network nearby and leaving the IMS network far away; The call request is routed to the call processing network element of the first IMS network, so that the call processing network element of the first IMS network routes the call request. In this way, in the area where the IMS network is configured and supports the routing method of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be routed to the local IMS network first, providing conditions for subsequent long-distance traffic to be carried by the IMS network , and the best routing mode can be selected according to the actual deployment of the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize the use of the IP routing of the IMS network and offload the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by equipment with high energy consumption The PSTN network with large area and high failure rate realizes the smooth transition from PSTN network to IMS network.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of a concrete routing process in which a PSTN network user calls an IMS network user in the prior art;

FIG. 2 provides a flowchart of a call routing method according to an embodiment of the present invention;

FIG. 3 provides a flowchart of another call routing method according to an embodiment of the present invention;

FIG. 4 is a flowchart of another call routing method provided by an embodiment of the present invention;

5 is a schematic diagram of a specific routing process for a PSTN network user to call an IMS network user according to an embodiment of the present invention;

6 is a schematic diagram of a specific routing process for a PSTN network user to call a PSTN network user according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of billing and traffic statistics for call services provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of a call routing device provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of another call routing device provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of another call routing device provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of another call routing device provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of another call routing device provided by an embodiment of the present invention;

Fig. 13 is a schematic diagram of another call routing device provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the process of completing a call, many network elements in the IMS network need to be used, including session border controller (session border controller, SBC for short) network elements, call session control function (call session control function, CSCF for short) network elements Element, Media Gateway Control Function (MGCF for short) network element, electronic number to Uniform Resource Identifier (URI for short) mapping (Electronic Numbers to URI Mapping, ENUM for short) server/domain name resolution server (Domain Name Server (DNS for short) and Home Subscription Server (HSS for short) participate in the implementation together.

Among them, the SBC network element is usually located between the access network and the IMS network, and enters the IMS core network as a proxy of the user. The CSCF network element is the core network element of the entire IMS network, and is mainly responsible for signaling control during the multimedia call session. According to the different functions of CSCF network elements, CSCF network elements can be divided into proxy CSCF (Proxy-CSCF, P-CSCF for short) network elements, interrogating-CSCF (Interrogating-CSCF, I-CSCF for short) network elements, and serving CSCF (Serving-CSCF) network elements. CSCF (S-CSCF for short) network element, MGCF network element is mainly responsible for the intercommunication between IMS network and CS network, HSS server is used to store user-related information, ENUM/DNS server defines the E. In the method in the database of the DNS server, each domain name converted from an E.164 number can correspond to a series of Session Initiation Protocol Uniform Resource Identifiers (SIP URI for short), so that the internationally unified E. The .164 phone number becomes a network address resource that can be used in the Internet. In the prior art, the IMS network is configured according to the provinces. Therefore, in the provinces where the IMS network is configured, the ENUM/DNS server in the IMS network of each province configures the IMS user data of the province and the area codes of other provinces to the ENUM/DNS of other provinces. The route to the server.

Embodiment one

In the implementation of the call routing method described in the embodiment of the present invention, it is necessary to first modify the settings of the existing ENUM/DNS server, that is, on the basis of the original traditional data area, add the H code of the mobile phone number, the mobile phone number The corresponding relationship between the home area code of the mobile phone number and the home network domain name of the mobile phone number, and the corresponding relationship between the area code of the fixed phone number and the home network domain name of the fixed phone number. For example, for fixed-line users in Shanghai, in addition to setting the local IMS network user data in Shanghai in the ENUM/DNS server of the IMS network, it is also necessary to set the corresponding relationship between the area code of other provinces and the domain name of the home network, such as setting the area code of Beijing 010 The corresponding relationship between the home network domain name beijing.ims.cn of Beijing, and the corresponding relationship between the area code 0532 of Qingdao or the area code 0531 of Jinan and the home network domain name Shandong.ims.cn of Shandong. For mobile users in Shanghai, in addition to setting the local IMS network user data in Shanghai in the ENUM/DNS server of the IMS network, it is also necessary to set the H code of the mobile phone in other provinces, the corresponding relationship between the area code of the number and the domain name of the network, for example Set the corresponding relationship between the mobile phone H code of the Beijing user, the area code 010 to which the number belongs, and the network domain name beijing.ims.cn to which Beijing belongs. It should be noted that the following call routing processes are all explained on this premise.

As shown in FIG. 2, it is a flow chart of a call routing method provided by an embodiment of the present invention. The call routing method includes:

In step 401, a call processing network element of a non-IMS network receives a call request sent by a calling user, and the call request includes the number of the calling user.

Wherein, the calling user is a non-IMS network user, if the calling user is a fixed telephone user, the call processing network element of the non-IMS network is the PSTN tandem office on the calling user side, and if the calling user is a mobile phone user, then The call processing network element scope of the non-IMS network is the gateway office of the mobile network on the calling user side. Specifically, the call request sent by the calling user is received by the PSTN tandem office or the mobile network gateway office at the calling user side.

Step 402: Obtain the area code of the place where the calling party number is located.

Specifically, the call processing network element of the non-IMS network has the function of analyzing the telephone number (fixed telephone or mobile telephone), and can obtain the area code of the place where the calling subscriber number belongs to according to existing rules. Among them, for a fixed number or a mobile number (mobile phone number) carrying an area code, the area code of the place where the fixed phone is located can be directly obtained from the fixed number, and the location of the mobile number carrying the area code can be directly obtained from the mobile number carrying the area code. The area code of the place of origin; for mobile phones that do not carry the area code, since the H code of each mobile number is unique, and the H code of each mobile number is corresponding to the place where the mobile number is located, therefore, by analyzing the The H code of the mobile phone is used to obtain the area code of the place where the mobile phone is located. For example, for mobile or fixed subscribers in Beijing, their home area codes are both Beijing area code 010.

Step 403, according to the area code of the place where the calling party number is located, determine whether the home area where the calling party number is located is equipped with a first IMS network, and whether the first IMS network supports the nearest IMS network and the far away Routing mode of the IMS network.

Specifically, whether to configure the first IMS network is related to the actual IMS network deployment. Generally, the deployment of the IMS network is preset according to different provinces and cities. For example, whether the calling side supports IMS network users may be determined by the PSTN network tandem office or mobile network gateway office to which the calling user belongs.

Step 404: If the first IMS network is configured in the place where the calling party number is located, and the first IMS network supports the routing mode, route the call request to the call of the first IMS network A processing network element, so that the call processing network element of the first IMS network routes the call request.

Specifically, if the first IMS network is not configured in the place where the calling party number is located, the routing method is the same as the routing method in the prior art, and the call is routed to the PSTN network, so that the PSTN network performs Routing will not be repeated here.

Further, the call routing method also includes:

Step 405: Acquiring the area code of the place where the called user number is located.

Wherein, the called user number is also included in the call request.

Step 406: According to the area code of the home area where the called user number is located, determine whether the home area where the called user number is located is configured with a second IMS network, and whether the second IMS network supports the routing mode.

Specifically, for a user whose calling side is a PSTN network, the judgment is made by the PSTN network tandem office where the calling number is located; for a user whose calling side is a mobile network, the judgment is made by the gateway office where the calling number is located judge. The tandem office or gateway office adds the judgment result of whether the called side configures the second IMS network and supports the routing mode to the call request, and sends it to the call processing network element of the first IMS network.

Step 407: Add the determination result to the call request and send it to the call processing network element of the first IMS network; the determination result includes whether the second IMS network is configured in the place where the called user number belongs , and the identification of whether the second IMS network supports the routing mode.

To sum up, the call processing network element of the non-IMS network can judge whether the IMS network is configured on the calling side through the area code of the calling subscriber number, and whether the IMS network on the calling side supports it can enter the IMS network and remote The routing mode of the outgoing IMS network, and further, through the area code of the called user's number, determine whether the called side is also configured with an IMS network, and whether the called side's IMS network also supports entering the IMS network and leaving the IMS How the network is routed. When the IMS network is configured on both the calling side and the called side, and the configured IMS network supports the routing mode of entering the IMS network and leaving the IMS network, the traffic can be carried through the IMS network to maximize the use of the IMS network. IP routing, diverting PSTN long-distance network traffic.

In the call routing method provided by the embodiment of the present invention, the call processing network element of the non-IMS network receives the call request sent by the calling user, obtains the area code of the place where the calling user number belongs to, and determines whether the place where the calling user number belongs Configure the first IMS network, and whether it supports the routing method of entering the IMS network nearby and leaving the IMS network far away; Routing to the call processing network element of the first IMS network, so that the call processing network element of the first IMS network routes the call request. In this way, in the area where the IMS network is configured and supports the routing method of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be routed to the local IMS network first, providing conditions for subsequent long-distance traffic to be carried by the IMS network , and the best routing mode can be selected according to the actual deployment of the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize the use of the IP routing of the IMS network and offload the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by equipment with high energy consumption The PSTN network with large area and high failure rate realizes the smooth transition from PSTN network to IMS network.

Embodiment two

As shown in FIG. 3, it is a flow chart of a call routing method provided by an embodiment of the present invention. The call routing method includes:

Step 501, the call processing network element of the first IMS network receives a call request sent by the call processing network element of the non-IMS network, and the call request includes the number of the called user.

Wherein, the call processing network element of the first IMS network described in the embodiment of the present invention may be an I-CSCF network element on the calling user side, specifically, the I-CSCF network element on the calling user side receives a call from a non-IMS network Process call requests sent by network elements

Step 502: Obtain the area code of the place where the called user number is located.

If the called user number is a fixed number or a mobile phone number carrying an area code, the area code of the place where the called user number is located is obtained from the called user number. For example, if the called user number is 01012345678, the area code of the called user number is 010; if the called user number is 053212345678, the area code of the called user number is 0532 .

If the called user number is a mobile number without an area code, the obtaining the area code of the place where the called user number belongs includes:

502a. Send a first query request to the telephone number mapping ENUM server of the first IMS network, so that the ENUM server of the first IMS network obtains the session initiation protocol of the called user number according to the first query request Universal Resource Identifier SIP URI.

Wherein, the first query request includes the called user number, and the ENUM server of the first IMS network includes the H code of the called user number, the area code of the place where the called user number is located, The corresponding relationship between the home network domain names of the places where the called user numbers are located. For example, if the called user number is the mobile number 18612345678, then the H code of the mobile number is 1234, and the EUNM server of the first IMS network will include the H code of the called user number and the area code of the place where the called user number belongs to. It is found from the corresponding relationship between the domain name of the home network of the place where the called user number is located, that the area code corresponding to the H code (1234) is 010, and the domain name of the home network is beijing.ims.cn, and then the mobile phone number is obtained SIP URI, that is, Sip: 861018612345678@beijing.ims.cn, user=phone.

502b. Receive the SIPURI of the called user number sent by the ENUM server of the first IMS network.

Wherein, the SIP URI of the called user number includes the area code of the home region of the called user number and the home network domain name of the home region of the called user number.

502c. Obtain the area code of the place where the called user number is located from the SIP URI of the called user number.

Step 503, according to the area code of the place where the called user number is located, determine whether the home place where the called user number is located is equipped with a second IMS network and whether the second IMS network supports the nearest IMS network and the far away IMS How the network is routed.

Specifically, whether to configure the second IMS network is related to the actual IMS network deployment. Generally, the deployment of the IMS network is preset according to different provinces. For example, whether the called side is configured with an IMS network and whether the IMS network supports the routing mode of the nearest inbound and the far away from the IMS network can be judged by the tandem office of the calling side, or by the IMS network of the calling side The network element of the I-CSCF to judge.

Step 504: If the second IMS network is configured in the home location of the called user number and the second IMS network supports the routing mode, obtain the IP address of the call processing network element of the second IMS network.

Step 505, according to the IP address of the call processing network element of the second IMS network, route the call to the call processing network element of the second IMS network, so that the call processing network element of the second IMS network can The call is routed.

Further, if the called user number is a fixed number or a mobile number carrying an area code, before obtaining the IP address of the call processing network element of the second IMS network in step 504, the method further includes:

Step 5040a: Send a first query request to the ENUM server of the first IMS network, so that the ENUM server of the first IMS network obtains the SIP URI of the called user number according to the first query request.

Wherein, the ENUM server of the first IMS network includes not only the H code of the called user number, the area code of the place where the called user number is located, and the home network domain name of the place where the called user number is located. The corresponding relationship among them also includes the corresponding relationship between the area code of the place where the called user number belongs to and the home network domain name of the place where the called user number belongs. For example, if the called party number is a fixed number 010123456, from the EUNM server of the first IMS network, from the corresponding relationship between the area code of the place where the called party number is located and the home network domain name of the place where the called party number is located It is found out that the area code corresponding to the fixed number is 010, and the home network domain name is beijing.ims.cn, and then the SIP URI of the mobile phone number is obtained, namely Sip: 8610123456@beijign.ims.cn, user=phone. Wherein, user=phone is a user identifier, which is used to indicate whether the user is an IMS user or not.

Step 5040b: Receive the SIPURI of the called user number sent by the ENUM server of the first IMS network.

Wherein, the SIP URI of the called user number includes the area code of the home region of the called user number and the home network domain name of the home region of the called user number.

Step 5040c: Obtain the home network domain name of the place where the called user number is located from the SIP URI of the called user number.

Specifically, obtaining the IP address of the call processing network element of the second IMS network in step 504 includes:

Step 504a, sending a second query request to the DNS server of the first IMS network.

Wherein, the second query request includes the home network domain name of the place where the called user number is located, and the DNS server of the first IMS network includes the home network domain name and the home network domain name of the place where the called user number is located. Describe the correspondence between the IP addresses of the call processing network elements of the second IMS network.

Step 504b: Receive the IP address of the call processing network element of the second IMS network sent by the DNS server of the first IMS network.

For example, if the number of the called user is: 02112345678, the S-CSCF network element of the first IMS network first converts it into an E.164 number: +862112345678, and then the S-CSCF network element of the first IMS network sends the An ENUM server of an IMS network sends the first query request containing the number, and the ENUM server returns the SIP URI of the number according to the request: sip: 862112345678@shanghai.ims.cn, user=phone, where shanghai.ims.cn is the It is called the domain name of the home network where the user number belongs. After receiving the domain name of the home network, the S-CSCF network element of the first IMS network sends a second query request to the DNS server of the first IMS network, and the DNS server finds the corresponding domain name of the second IMS network according to the domain name of the home network. The IP address of the call processing network element, and return the IP address of the call processing network element of the IMS network belonging to Shanghai to the S-CSCF network element of the first IMS network, according to the IP address of the call processing network element of the IMS network belonging to Shanghai Province , to route the call to the call processing network element of the IMS network belonging to Shanghai Province for subsequent routing of the call.

Optionally, when the second IMS network is configured in the home area where the called user is located and the second IMS network does not support the routing mode of entering the IMS network nearby and leaving the IMS network far away, perform steps 506-507; if the called user number If the second IMS network is not configured in the home location, step 508 is performed.

Step 506. Determine whether the called user is a user of the second IMS network.

Because the ENUM server of the first IMS network where the existing calling user is located configures the user data of the first IMS network and the area code of the home area where the called user is located to the ENUM/ The route of the DNS server, if the result returned by the ENUM/DNS server of the second IMS network contains the SIP URI of the called user, and it is determined that the called user is a user of the second IMS network, then step 507 is performed; if the second IMS The result returned by the ENUM/DNS server of the network does not contain the SIP URI of the called user, and it is determined that the called user is not a user of the second IMS network, and step 508 is executed.

Step 507: Obtain the IP address of the call processing network element of the second IMS network; route the call request to the call of the second IMS network according to the IP address of the call processing network element of the second IMS network A processing network element, so that the call processing network element of the second IMS network routes the call request.

Wherein, the result returned by the ENUM server of the second IMS network includes the SIP URI of the called user, and the SIP URI of the called user includes the home network domain name of the place where the called user is located, and the second URL is obtained according to the home network domain name. For the IP address of the call processing network element of the IMS network, refer to the description in step 504 for details, and will not be repeated here.

Step 508: Route the call request to the call processing network element of the PSTN network through the media gateway control function network element, so that the call processing network element of the PSTN network routes the call request.

A call routing method provided by an embodiment of the present invention includes: a call processing network element of a first IMS network receives a call request sent by a call processing network element of a non-IMS network, and obtains an area code of a place where the called user number is located; According to the area code of the place where the called user number is located, determine whether the home place where the called user number is located is configured with a second IMS network, and whether it supports the routing mode of entering the IMS network nearby and leaving the IMS network far away; If a second IMS network is configured at the home location of the called user number and the second IMS network supports the routing method, then obtain the IP address of the call processing network element of the second IMS network; according to the second IMS network routing the call request to the call processing network element of the second IMS network, so that the call processing network element of the second IMS network can route the call request. In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

Embodiment three

As shown in FIG. 4, it is a flow chart of a call routing method provided by an embodiment of the present invention. The call routing method includes:

Step 601, the call processing network element of the second IMS network receives the call request sent by the call processing network element of the first IMS network, and the call request includes the number of the called user.

Wherein, the execution subject of the call processing network element of the second IMS network in the embodiment of the present invention is the I-CSCF network element of the called user side IMS network, specifically, the I-CSCF network element of the called user side IMS network receives the The call processing network element of the first IMS network sends the call request.

Step 602, sending a first query request to the ENUM server of the second IMS network, so that the ENUM server of the second IMS network queries whether the SIP URI containing the called user number is included according to the first query request, and sending the query result to the call processing network element of the second IMS network, where the first query request includes the called user number.

Specifically, the query of whether the ENUM server of the second IMS network contains the number of the called user is to determine whether the called user is an IMS network user, and if the query result is a SIP URI containing the number of the called user , it means that the called user is an IMS network user, and the I-CSCF of the second IMS network obtains the S-CSCF registered by the called user by querying the HSS, so as to route the call to the called user through the S-CSCF; If the result is a SIP URI that does not contain the number of the called user, it means that the called user is a non-IMS network user. The I-CSCF of the second IMS network analyzes the called number and routes the call to the MGCF at the called home location. The call is routed to the PSTN network or mobile network to which the called party belongs through the MGCF.

Step 603: Receive the query result sent by the ENUM server of the second IMS network.

Step 604: If the query result includes the SIP URI of the called user number, send a second query request to the home subscriber server HSS of the second IMS network; receive the request sent by the HSS server of the second IMS network Information about the SCSCF network element corresponding to the called user number; routing the call request to the SCSCF network element corresponding to the called user number, so that the SCSCF will The call request is routed to the called user.

It should be noted that the HSS server contains user configuration files, performs user authentication and authorization, and can provide information about the user's physical location, and the entity communicating with the HSS server is the CSCF network element. Usually the S-CSCF network element will download and use this file when the user registers on the network, so when the I-CSCF network element on the called side queries the HSS server, the HSS server will obtain an S-CSCF network element that provides services for the user address and route the call to the S-CSCF network element according to the address, and then the S-CSCF network element routes the call service to the called user through the established signaling channel.

Step 605: If the query result does not contain the SIP URI of the called user number, route the call request through the media gateway control function network element of the second IMS network according to the called user number to the called user.

In a call routing method provided by an embodiment of the present invention, the call processing network element of the second IMS network receives the call request sent by the call processing network element of the first IMS network, and sends the first query request to the ENUM server of the second IMS network, In order to make the ENUM server of the second IMS network query whether the SIP URI containing the called user number is inquired according to the first query request, and send the query result to the call processing network element of the second IMS network; receive the ENUM server of the second IMS network The query result sent by the server; if the query result contains the SIP URI of the called user number, then send the second query request to the home subscriber server HSS of the second IMS network; receive the called user number sent by the HSS server of the second IMS network Corresponding SCSCF network element information; routing the call request to the SCSCF network element corresponding to the called user number, so that the SCSCF can route the call request to the called user; if the query result If the SIP URI does not contain the called user number, the call request is routed to the called user through the media gateway control function network element of the second IMS network according to the called user number. In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

Embodiment four

For the routing methods shown in Figure 2 to Figure 4, refer to Figure 5, the caller is a PSTN network user in Shanghai, and the called is an IMS network mobile user in Beijing, the mobile number is 13812345678, and both Shanghai and Beijing are configured with IMS networks And the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away. In the ENUM/DNS server in the IMS network, the H code data of the mobile phone number, the area code of the place where the number belongs and the number are preset. Taking the corresponding relationship between the home network domain names in the place of origin as an example, the specific routing process in the scenario where a PSTN network user calls an IMS network user is described in detail, specifically including the following steps:

Step 1a, the caller side PSTN network user initiates a call request.

Wherein, the call request includes the number of the calling user and the number of the called user.

Step 2a, the PSTN end office on the calling side receives the call request and routes it to the PSTN tandem office on the calling side.

Step 3a: The PSTN tandem office on the calling side receives the call request and determines where the calling subscriber number belongs to configure the IMS network, and the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away.

Step 4a, the MGCF network element on the calling side receives the call request sent by the PSTN tandem office on the calling side and routes it to the I-CSCF network element on the calling side.

In step 5a, the I-CSCF network element on the calling side obtains the area code of the called subscriber number by querying the ENUM/DNS server on the calling side.

In step 6a, the I-CSCF network element at the calling side determines the IMS network configuration on the called side according to the area code of the called subscriber number, and the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away.

Specifically, in step 5a, the ENUM server returns the SIP URI of the number of the called user in Beijing, which includes the home area code 010 of the called user and the home network domain name beijing.ims.cn, so that the called party can be determined according to the area code 010. An IMS network is configured in the user's home location.

Step 7a: The I-CSCF network element on the calling side initiates a query request to the DNS server on the calling side according to the home network domain name in the SIP URI of the called user number.

In step 8a, the I-CSCF network element on the calling side receives the IP address of the I-CSCF network element on the called side returned by the DNS server on the calling side.

It should be noted that the ENUM server and the DNS server may be integrated in the same server, or may be two mutually independent servers.

Step 9a, the I-CSCF network element on the calling side routes the call to the I-CSCF network element on the called side according to the IP address.

In step 10a, the I-CSCF network element at the called side queries the HSS server at the called side.

Specifically, since the called user is an IMS network user in Beijing, and the number of the called user is 13812345678, the HSS server on the called side must store the information of the user, so the I-CSCF network element on the called side If the HSS server is successfully queried (that is, the called user information is included), the call is routed to the called user through the S-CSCF network element and the SBC network element on the called side.

In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

Embodiment five

For the routing methods shown in Figures 2 to 4, refer to Figure 6, the calling party is a PSTN network user in Shanghai, and the called party is a fixed telephone number user in the PSTN network in Beijing, and the number is 01012345678, and both Shanghai and Beijing Configure the IMS network, and the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away. The ENUM/DNS server in the IMS network pre-sets the area code of the place where the fixed phone number is located and the place where the number is located. Taking the corresponding relationship between the domain names of the home network as an example, the specific routing process in the scenario where a PSTN network user calls an IMS network user is described in detail, including the following steps:

Step 1b, the PSTN network user at the calling side initiates a call request.

Wherein, the call request includes the number of the calling user and the number of the called user.

Step 2b: The PSTN end office on the calling side receives the call request and routes it to the PSTN tandem office on the calling side.

Step 3b: The PSTN tandem office on the calling side receives the call request and determines where the calling party number belongs to configure the IMS network, and the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away.

Step 4b, the MGCF network element on the calling side receives the call request sent by the PSTN tandem office on the calling side and routes it to the I-CSCF network element on the calling side.

In step 5b, the I-CSCF network element at the calling side obtains the area code of the place where the number of the called party belongs.

Specifically, for the called user 01012345678 in this embodiment, the method for obtaining the area code may refer to step 502, which will not be repeated here.

Step 6b. The I-CSCF network element on the calling side determines the IMS network configuration on the called side according to the area code of the called subscriber number, and the IMS network supports the routing mode of entering the IMS network nearby and leaving the IMS network far away.

In step 7b, the I-CSCF network element at the calling side sends a query request to the ENUM server at the calling side.

Wherein, the query request includes the number of the called user.

Step 8b, the ENUM server at the calling side returns the SIP URI of the called party number according to the query request.

Specifically, if the called number is Beijing's fixed number 01012345678, the ENUM/DNS server will return the SIP URI of the called user number: sip: 861012345678@beijing.ims.cn, user=phone to the I-CSCF on the calling side A network element, the SIP URI includes the domain name of the home network where the called user is located.

Step 9b: The I-CSCF network element on the calling side initiates a query request to the DNS server on the calling side according to the home network domain name of the called user.

Step 10b, the I-CSCF network element on the calling side receives the IP address of the I-CSCF network element on the called side returned by the DNS server on the calling side.

Step 11b, the I-CSCF network element on the calling side routes the call to the I-CSCF network element on the called side according to the IP address.

In step 12b, the I-CSCF network element at the called side inquires whether the ENUM/DNS server at the called side contains the number of the called party.

If it contains (i.e. query is successful), the called user is an IMS network user, and the called user in this embodiment is an IMS network user, so step 13b is performed; otherwise, the called user is a non-IMS network user, and step 14b is performed ~16b.

In step 13b, the I-CSCF network element at the called side queries the HSS server at the called side and routes the call to the called user.

Specifically, when the I-CSCF network element on the called side queries the HSS server, the HSS server will obtain the address of an S-CSCF network element that provides services for the user and route the call to the S-CSCF network element according to the address. Then the S-CSCF network element routes the call service to the called user through the established signaling channel.

In step 14b, the I-CSCF network element on the called side routes the call to the MGCF network element on the called side by analyzing the home area code of the called number.

Step 15b, the MGCF at the called side routes the call to the PSTN tandem office according to the home area code of the called number.

Step 16b, the PSTN end office on the called side receives the call request and routes it to the PSTN network user on the called side.

In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

Embodiment six

In order to meet the needs of network maintenance, service statistics need to be performed on calls carried by traffic through the IMS network. Therefore, for the call routing methods described in FIGS. The call processing network element of the IMS network (IMS network at the called side) may add its IP address to the Record-Route header field during the call session establishment phase, so as to perform service statistics on the call.

It should be noted that in the traditional IMS network, the I-CSCF network element is a stateless SIP PROXY, so the session state will not be recorded, that is, during the establishment phase of the call service, the signaling The modification and termination of the session do not go through the I-CSCF, so the traditional I-CSCF cannot perform statistics and billing on the session. Therefore, it is necessary to upgrade the functions of the traditional I-CSCF network element.

The specific method is that the call processing network elements of the first IMS network and the second IMS network can add their IP addresses or domain names to the Record-Route header field during the call session establishment phase, thereby ensuring establishment, modification, and termination), all signaling passes through the I-CSCF network element, so that charging and traffic statistics for the session can be realized. Among them, the Record-Route header field is added by PROXY in the request, and is used to force subsequent requests in the session to pass through this PROXY.

As shown in Figure 7, for the call routing method described in Figure 2 to Figure 6, on the basis of this method, by adding the call processing network elements of the first IMS network and the second IMS network in the Record-Route header field The IP address or the domain name of the home network realizes the statistics and charging of the call service. In the embodiment of the present invention, the call processing network element of the second IMS network is the I-CSCF network element of the called user side IMS network.

The interaction process of the session establishment signaling shown in the dotted box 81 in Fig. 7 is described in detail below, specifically including:

Step 1c, the calling user initiates a session establishment signaling to the calling side MGCF network element.

Steps 2c to 6c, the MGCF network element on the calling side receives the session establishment signaling and passes it through the I-CSCF network element on the calling side, the S-CSCF network element on the calling side, the I-CSCF network element on the called side, and the From the MGCF network element to the called user.

Step 7c, the called user receives the session establishment signaling, generates and sends a response signaling to the called side MGCF network element.

Steps 8c to 12c, the MGCF network element on the called side receives the response signaling and passes through the I-CSCF network element on the called side, the S-CSCF network element on the calling side, the I-CSCF network element on the calling side, and the MGCF on the calling side The network element sends the response information to the called user.

Step 13c, the calling user sends confirmation signaling, and through the calling side MGCF network element, calling side I-CSCF network element, calling side S-CSCF network element, called side I-CSCF network element, called From the side MGCF network element to the called user.

Step 14c: After receiving the confirmation signaling, the I-CSCF network element on the calling side and the I-CSCF network element on the called side send an accounting start signaling to the charging system on the calling side and the charging system on the called side, and start Billing.

Specifically, the billing system on the calling side or the billing system on the called side depends on the types of the calling user and the called user. its billing. For example, if both the calling user and the called user are PSTN network users, then when the routing methods of "entering the IMS network at the nearest" and "exiting the IMS network at the far end" are used, the billing system on the calling side and the called side All billing systems require billing. For another example, if the calling user is a PSTN user and the called user is an IMS network user, only the I-CSCF on the calling side needs to perform billing, and the IMS network user on the called side does not need to Billing.

It should be noted that, for the IMS network using the SIP protocol, in order to ensure the success rate of the call and improve the user experience, the signaling interaction uses a three-way handshake mechanism during the entire call process. For example, the called user receives After the session establishment signaling, a 200ok signaling (that is, the response signaling shown in Figure 7) will be sent to the calling user, and after receiving the 200ok signaling, the calling user will return ACK in turn (that is, the response signaling shown in Figure 7). Confirmation signaling shown) to the called user to complete the three-way handshake process. Other signaling, such as the interactive process of session modification signaling and session termination signaling, also needs to send 200ok signaling, but whether to perform 200ok signaling ACK confirmation depends on the specific situation. For example, in the SIP protocol, both reINVITE signaling and UPDATE signaling can be used to modify call parameters. The difference is that when the reINVITE signaling is used, an ACK needs to be replied; when the UPDATE signaling is used, an ACK does not need to be replied. It should be noted that, in FIG. 6 , the ACK confirmation signaling returned by the calling user or the called user upon receiving the session modification signaling and the session termination signaling is not shown. The transmission process of the response signaling in the dotted line box 82, the dotted line box 83, the dotted line box 84 and the dotted line box 85 is the same as the process in the dotted line box 81, and they are all forwarded sequentially. In order to simplify the signaling interaction process in Fig. 6, the Intermediate forwarding process.

When the conversation scene needs to be changed, such as changing a voice call to a video call, the conversation scene can be modified by sending a session modification signaling. For the specific interaction process of the session modification signaling, refer to the dotted line box 82 and the dotted line box 83 in FIG. 7 The signaling interaction process, wherein the session modification signaling in the dotted line box 82 is initiated by the calling user, and then passes through the calling side MGCF network element, the calling side I-CSCF network element, the calling side S-CSCF network element, the calling side S-CSCF network element, When the I-CSCF network element on the called side and the MGCF network element on the called side arrive at the called user, the I-CSCF network element on the called side sends the charging Modify the signaling information to the calling side or the called side billing system, and modify the billing method; the session modification signaling in the dotted line box 83 is initiated by the called user, via the called side MGCF network element, called side I- CSCF NE, calling-side S-CSCF NE, calling-side I-CSCF NE, calling-side MGCF NE to the calling user, the calling-side or called-side I-CSCF NE After confirming the session modification signaling sent by the user, the charging modification signaling information is sent to the charging system at the calling side or the called side.

When the session ends, the session can be ended by sending the session termination signaling. The interaction process of the session termination signaling can refer to the signaling interaction process shown in the dotted line box 84 and the dotted line box 85 in FIG. The signaling can be initiated by the calling user or by the called user. The session modification signaling in the dotted line box 84 is initiated by the calling user, and then through the calling side MGCF network element and the calling side I-CSCF network element , the S-CSCF network element on the calling side, the I-CSCF network element on the called side, and the MGCF network element on the called side arrive at the called user. After receiving the session termination signaling message sent by the called user, the I-CSCF network element on the called side After confirming the signaling message, send the charging termination signaling information to the calling side or the called side charging system to complete the charging of this session; the session modification signaling in the dotted line box 85 is initiated by the called user, To the calling user via the MGCF NE at the called side, the I-CSCF NE at the called side, the S-CSCF NE at the calling side, the I-CSCF NE at the calling side, and the SBC NE at the calling side, the calling party or After receiving the confirmation signaling of the session termination signaling sent by the calling user, the I-CSCF network element at the called side sends the accounting termination signaling information to the charging system at the calling side or the called side to complete the session Billing, at the same time, the I-CSCF network element on the calling side or called side adds the call to the traffic statistics, and records the call success rate, call duration and other information.

It should be noted that, for the I-CSCF network element on the calling side, it is necessary to identify the traffic entering the IMS network from the PSTN network nearby, and to charge for this type of traffic. Add an identification indicating that the traffic is a calling transfer type bill, and perform outgoing call type statistics on this type of bill. The specific implementation method is to identify according to the IP address or home network domain name of the MGCF network element at the calling side, the trunk group standard of the MGCF network element at the calling side, the calling user number, or any combination of the above three.

For the I-CSCF network element on the called side, it is necessary to identify the traffic that is far away from the IMS network and enter the PSTN network nearby, and charge for this type of traffic. Call traffic is the identification of the called transfer type bill, and the incoming call type statistics are made for this type of bill. The specific implementation method is that it can be expressed according to the IP address of the I-CSCF network element at the called side or the domain name of the home network, or according to the IP address or domain name of the network element of the I-CSCF network element at the calling side, the number of the calling party, or the above-mentioned any combination of the three.

The billing method provided by the embodiment of the present invention realizes the function of counting and billing the call service by adding the IP address of the call processing network element in the Record-Route header field, and can not only collect information such as the success rate and duration of the call Statistics can also meet the demand for funds during network operation and maintenance.

Embodiment seven

An embodiment of the present invention provides a call routing device 80. As shown in FIG. 8, the device includes:

A receiving unit 801, configured to receive a call request sent by a calling user, where the call request includes a calling user number;

An obtaining unit 802, configured to obtain the area code of the place where the calling party number is located;

The determining unit 803 is configured to determine, according to the area code of the place where the calling party number is located, whether a first IMS network is configured in the home area where the calling party number is located, and whether the first IMS network supports access to a nearby IMS network, In terms of the routing way out of the IMS network; the determining unit 803 is also configured to determine whether the second IMS network is configured in the home of the called user number according to the area code of the home of the called user number, and the Whether the second IMS network supports the routing method;

A routing unit 804, configured to route the call request to the first IMS if the first IMS network is configured in the home region where the calling party number is located, and the first IMS network supports the routing mode. A call processing network element of the network, so that the call processing network element of the first IMS network routes the call request.

Further, as shown in FIG. 9 , the call routing device further includes: an adding unit 805 and a sending unit 806;

Wherein, the obtaining unit 802 is further configured to obtain the area code of the place where the called user number belongs;

The determining unit 803 is further configured to determine, according to the area code of the home area where the called user number is located, whether a second IMS network is configured in the home area where the called user number is located, and whether the second IMS network supports the routing mode ;

The adding unit 805 is configured to add the determination result to the call request;

The sending unit 806 is configured to send the call request added with the determination result to the call processing network element of the first IMS network; the determination result includes whether a second IMS is configured in the place where the called user number belongs. network, and the identification of whether the second IMS network supports the routing mode.

In a call routing device provided by an embodiment of the present invention, the receiving unit receives the call request sent by the calling user, the obtaining unit obtains the area code of the place where the calling user number belongs to, and the determining unit determines whether the calling user number is located at the place where it is configured The first IMS network, and whether it supports the routing method of entering the IMS network nearby and leaving the IMS network far away; if the first IMS network is configured in the place where the calling user number belongs, and supports the routing method, the routing unit will The call request is routed to the call processing network element of the first IMS network, so that the call processing network element of the first IMS network routes the call request. In this way, in the area where the IMS network is configured and supports the routing method of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be routed to the local IMS network first, providing conditions for subsequent long-distance traffic to be carried by the IMS network , and the best routing mode can be selected according to the actual deployment of the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize the use of the IP routing of the IMS network and offload the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by equipment with high energy consumption The PSTN network with large area and high failure rate realizes the smooth transition from PSTN network to IMS network.

Embodiment eight

An embodiment of the present invention provides a call routing device 100. As shown in FIG. 10, the device includes:

The receiving unit 1001 is configured to receive a call request sent by a call processing network element of a non-IMS network, where the call request includes a called user number;

An obtaining unit 1002, configured to obtain the area code of the place where the called user number belongs;

The determining unit 1003 is configured to determine, according to the area code of the place where the called user number is located, whether a second IMS network is configured in the home place where the called user number is located, and whether the second IMS network supports access to the nearest IMS network, The way of routing out of the IMS network;

The obtaining unit 1002 is configured to obtain a call processing network element of the second IMS network if the second IMS network is configured in the home location of the called user number and the second IMS network supports the routing method IP address;

The routing unit 1004 is configured to route the call request to the call processing network element of the second IMS network according to the IP address of the call processing network element of the second IMS network, so that the call of the second IMS network The processing network element routes the call request.

Further, as shown in FIG. 10, the determining unit 1003 is further configured to determine whether the call request contains a determination result, and the determination result includes whether a second IMS network is configured in the place where the called user number is located. , and whether the second IMS network supports the identification of the routing mode;

The obtaining unit 1002 is specifically configured to obtain the area code of the place where the called user number belongs if the call request does not include the determination result.

Further, as shown in FIG. 11 , the call routing device 100 further includes: a sending unit 1005; wherein, the sending unit 1005 is configured to send the first mobile number if the called party number is a mobile number without an area code. A query request is mapped to the telephone number ENUM server of the first IMS network, so that the ENUM server of the first IMS network obtains the Session Initiation Protocol Universal Resource Identifier (SIP) of the called user number according to the first query request URI, the first query request includes the called user number, the ENUM server of the first IMS network includes the H code of the called user number, the area code of the place where the called user number is located, The corresponding relationship between the domain names of the home network where the called user number is located;

The receiving unit 1001 is further configured to receive the SIP URI of the called user number sent by the ENUM server of the first IMS network, the SIP URI of the called user number includes the location of the called user number The area code and the home network domain name of the place where the called user number is located;

The obtaining unit 1002 is further configured to obtain the area code of the place where the called user number belongs from the SIP URI of the called user number.

Further, as shown in FIG. 11, the sending unit 1005 is further configured to send a first query request to the ENUM of the first IMS network if the called user number is a fixed number or a mobile number with an area code. server, so that the ENUM server of the first IMS network obtains the SIP URI of the called user number according to the first query request, and the ENUM server of the first IMS network also includes the attribution of the called user number The corresponding relationship between the area code of the place and the domain name of the home network of the place where the called user number is located;

The receiving unit 1001 is further configured to receive the SIP URI of the called user number sent by the ENUM server of the first IMS network, the SIP URI of the called user number includes the attribution of the called user number area code and the home network domain name of the place where the called user number is located;

The obtaining unit 1002 is further configured to obtain the home network domain name of the place where the called user number is located from the SIP URI of the called user number.

Further, as shown in FIG. 11 , the sending unit 1005 is further configured to send a second query request to the domain name resolution DNS server of the first IMS network, the second query request includes the called user number The home network domain name of the place where the called user number is located, and the DNS server includes the corresponding relationship between the home network domain name where the called user number belongs and the IP address of the second IMS network;

The receiving unit 1001 is further configured to receive and acquire the IP address of the second IMS network sent by the DNS server of the first IMS network.

Further, as shown in FIG. 11 , the call routing device 100 further includes: a statistical unit 1006; wherein the obtaining unit 1002 is also configured to obtain the IP address of the media gateway control network element of the first IMS network;

The determining unit 1003 is further configured to determine the call type of the call request according to the IP address of the media gateway control network element of the first IMS network;

The statistical unit 1006 is configured to add the IP address of the call processing network element of the first IMS network to the Record-Route header field if the call type of the call request is a calling transfer call, Perform service statistics on the call request.

In a call routing device provided by an embodiment of the present invention, the receiving unit receives the call request sent by the call processing network element of the non-IMS network, and the obtaining unit obtains the area code of the place where the called user number belongs; the determining unit according to the called user The area code of the place where the number belongs to determine whether the second IMS network is configured in the place where the called user number is located, and whether it supports the routing method of entering the IMS network nearby and leaving the IMS network far away; if the home place of the called user number is configured with the second Two IMS networks and the second IMS network supports the routing method, then obtain the IP address of the call processing network element of the second IMS network; according to the IP address of the call processing network element of the second IMS network, the routing unit will call The request is routed to the call processing network element of the second IMS network, so that the call processing network element of the second IMS network routes the call request. In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

Embodiment nine

An embodiment of the present invention provides a call routing device 120. As shown in FIG. 12, the device includes:

The receiving unit 1201 is configured to receive a call request sent by a call processing network element of the first IMS network, where the call request includes a called user number;

A sending unit 1202, configured to send a first query request to the ENUM server of the second IMS network, so that the ENUM server of the second IMS network queries whether the number of the called user is included according to the first query request. SIP URI, and send the query result to the call processing network element of the second IMS network, the first query request includes the called user number;

The receiving unit 1201 is further configured to receive the query result sent by the ENUM server of the second IMS network;

The routing unit 1203 is configured to send a second query request to the HSS server of the second IMS network if the query result includes the SIP URI of the called user number; the receiving unit receives the The SCSCF network element information corresponding to the called user number sent by the HSS server of the second IMS network; routing the call request to the SCSCF network element corresponding to the called user number, so that the serving call session control function routes the call request to the called user;

The routing unit 1203 is further configured to pass the call request through the media gateway of the second IMS network according to the called user number if the query result does not include the SIPURI of the called user number The control function network element routes to the called user.

Further, as shown in FIG. 13, the call routing device 120 further includes:

The obtaining unit 1204 is further configured to obtain the IP address of the call processing network element of the first IMS network and the IP address of the media gateway control function network element of the second IMS network;

The determining unit 1205 is further configured to determine the call type of the call request according to the IP address of the call processing network element of the first IMS network and the IP address of the media gateway control function network element of the second IMS network;

The statistical unit 1206 is configured to add the IP address of the call processing network element of the second IMS network to the Record-Route header field if the call type of the call request is a called transfer call, and calculate the call request Make business statistics.

In a call routing device provided by an embodiment of the present invention, a call processing network element of a second IMS network receives a call request sent by a call processing network element of a first IMS network, and sends a first query request to an ENUM server of a second IMS network, In order to make the ENUM server of the second IMS network query whether the SIP URI containing the called user number is inquired according to the first query request, and send the query result to the call processing network element of the second IMS network; receive the ENUM server of the second IMS network The query result sent by the server; if the query result contains the SIP URI of the called user number, then send the second query request to the home subscriber server HSS of the second IMS network; receive the called user number sent by the HSS server of the second IMS network Corresponding SCSCF network element information; routing the call request to the SCSCF network element corresponding to the called user number, so that the SCSCF can route the call request to the called user; if the query result If the SIP URI does not contain the called user number, the call request is routed to the called user through the media gateway control function network element of the second IMS network according to the called user number. In this way, in the area where the IMS network is configured and supports the routing mode of entering the IMS network nearby and leaving the IMS network far away, the long-distance traffic can be carried by the IMS network, no longer as in the prior art, the long-distance traffic can only be carried by the PSTN Instead, the best routing method can be selected according to the actual deployment of the IMS network, that is, whether the long-distance traffic is carried by the PSTN long-distance network or by the IMS network. In addition, the long-distance traffic is carried by the IMS network, which can maximize The IP routing of the IMS network is used to divert the traffic of the PSTN long-distance network, which is conducive to energy saving and emission reduction. At the same time, the IMS network can gradually be replaced by the PSTN network with high energy consumption, large floor area, and high failure rate to realize Smooth transition from PSTN network to IMS network.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, and include several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), magnetic disk or optical disk, etc., which can store program codes. medium.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (12)

1. A call routing method, characterized in that, comprising: The call processing network element of the non-IMS network receives the call request sent by the calling user, and the call request includes the calling user number; Obtain the area code of the place where the calling party number is located; According to the area code of the place where the calling party number is located, determine whether the home area where the calling party number is located is configured with a first IMS network, and whether the first IMS network supports access to the IMS network that is nearby and exits the IMS network that is far away routing method; If the first IMS network is configured in the home location of the calling party number, and the first IMS network supports the routing method, routing the call request to a call processing network element of the first IMS network , so that the call processing network element of the first IMS network routes the call request; The call request also includes the called user number; the method also includes: Obtaining the area code of the place where the called user number is located; according to the area code of the home area where the called user number is located, determine whether a second IMS network is configured in the home area where the called user number is located, and the second IMS network Whether to support the routing method; Add the determination result to the call request, and send it to the call processing network element of the first IMS network; the determination result includes whether the second IMS network is configured in the home location of the called user number, and the An indication of whether the second IMS network supports the routing mode. 2. A call routing method, characterized in that, comprising: The call processing network element of the first IMS network receives the call request sent by the call processing network element of the non-IMS network, and determines whether the call request contains a determination result, and the determination result includes whether the called user number is located at the home location where the first is configured. Two IMS networks, and whether the second IMS network supports the identification of the routing mode; The call request also includes the number of the called user; Obtaining the area code of the place where the called user number is located; The acquiring the area code of the place where the called user number is located includes: if the call request does not include the determination result, acquiring the area code of the home area where the called user number is located; According to the area code of the home area where the called user number is located, determine whether the home area where the called user number is located is configured with a second IMS network and whether the second IMS network supports the route of entering the IMS network at the nearest location and leaving the IMS network at the far end Way; If the second IMS network is configured at the home location of the called user number and the second IMS network supports the routing mode, then acquire the IP address of the call processing network element of the second IMS network; Routing the call request to the call processing network element of the second IMS network according to the IP address of the call processing network element of the second IMS network, so that the call processing network element of the second IMS network can Call requests are routed. 3. The call routing method according to claim 2, wherein the called user number is a fixed number or a mobile number carrying an area code or a mobile number not carrying an area code; If the called user number is a mobile number without an area code, the obtaining the area code of the place where the called user number belongs includes: sending a first query request to the telephone number mapping ENUM server of the first IMS network, so that the ENUM server of the first IMS network obtains the SIP common resource of the called user number according to the first query request Identify the SIP URI, the first query request includes the called user number, the ENUM server of the first IMS network includes the H code of the called user number, the attribution of the called user number Correspondence between the area code and the domain name of the home network where the called user number is located; receiving the SIP URI of the called subscriber number sent by the ENUM server of the first IMS network, the SIP URI of the called subscriber number including the area code of the place where the called subscriber number belongs and the called subscriber number The domain name of the home network where it is located; The area code of the place where the called user number is located is acquired from the SIP URI of the called user number. 4. The call routing method according to claim 3, wherein if the called user number is a fixed number or a mobile number carrying an area code, said acquiring the IP address of the call processing network element of the second IMS network Before the address, the method also includes: sending a first query request to the ENUM server of the first IMS network, so that the ENUM server of the first IMS network obtains the SIP URI of the called user number according to the first query request, and the first IMS The ENUM server of the network also includes the corresponding relationship between the area code of the place where the called user number is located and the domain name of the home network where the called user number is located; receiving the SIP URI of the called subscriber number sent by the ENUM server of the first IMS network, the SIP URI of the called subscriber number including the area code of the place where the called subscriber number belongs and the called subscriber number The domain name of the home network where it is located; Obtain the home network domain name of the place where the called user number is located from the SIP URI of the called user number. 5. The call routing method according to claim 3 or 4, wherein said acquiring the IP address of the call processing network element of the second IMS network comprises: Sending a second query request to the domain name resolution DNS server of the first IMS network, the second query request includes the home network domain name of the place where the called user number belongs, and the DNS server includes the called The corresponding relationship between the domain name of the home network where the user number belongs to and the IP address of the second IMS network; receiving and acquiring the IP address of the second IMS network sent by the DNS server of the first IMS network. 6. The call routing method according to claim 2, further comprising: Obtain the IP address of the media gateway control network element of the first IMS network; determining the call type of the call request according to the IP address of the media gateway control network element of the first IMS network; If the call type of the call request is a calling transfer call, add the IP address of the call processing network element of the first IMS network to the Record-Route header field, and perform service statistics on the call request . 7. A call routing device, characterized in that it comprises: a receiving unit, configured to receive a call request sent by a calling user, where the call request includes a calling user number; an obtaining unit, configured to obtain the area code of the place where the calling party number belongs; A determining unit, configured to determine whether the calling subscriber number is configured with a first IMS network based on the area code of the calling subscriber number's home zone, and whether the first IMS network supports access to the nearest IMS network, A routing method out of the IMS network; the determining unit is also used to determine whether a second IMS network is configured in the home of the called user number according to the area code of the home of the called user number, and the second IMS network Whether to support the routing method; A routing unit, configured to route the call request to the first IMS network if the first IMS network is configured in the home location of the calling party number and the first IMS network supports the routing mode a call processing network element of the first IMS network, so that the call processing network element of the first IMS network routes the call request; The call routing device also includes: an adding unit and a sending unit; The obtaining unit is also used to obtain the area code of the place where the called user number belongs; The adding unit is configured to add the determination result to the call request; The sending unit is configured to send the call request added with the determination result to the call processing network element of the first IMS network; the determination result includes whether the second IMS network is configured in the place where the called user number belongs , and the identification of whether the second IMS network supports the routing mode. 8. A call routing device, characterized in that it comprises: A receiving unit, configured to receive a call request sent by a call processing network element of a non-IMS network, where the call request includes a called user number; A determining unit, configured to determine whether the call request contains a determination result after the receiving unit receives the call request sent by the call processing network element of the non-IMS network, and the determination result includes the attribution of the called user number. Whether to configure the second IMS network, and whether the second IMS network supports the identification of the routing mode; an obtaining unit, configured to obtain the area code of the place where the called user number belongs; The obtaining unit is specifically configured to obtain the area code of the place where the called user number belongs if the call request does not include the determination result; The determining unit is configured to determine, according to the area code of the home of the called user number, whether a second IMS network is configured in the home of the called user number and whether the second IMS network supports access to the nearest IMS network, The way of routing far out of the IMS network; The obtaining unit is further configured to obtain the call processing network of the second IMS network if the second IMS network is configured in the home location of the called user number and the second IMS network supports the routing mode. Yuan's IP address; a routing unit, configured to route the call request to the call processing network element of the second IMS network according to the IP address of the call processing network element of the second IMS network, so that the call processing of the second IMS network The network element routes the call request. 9. The call routing device according to claim 8, further comprising: a sending unit, The sending unit is configured to send a first query request to the telephone number mapping ENUM server of the first IMS network if the called user number is a mobile number without an area code, so that the ENUM of the first IMS network The server acquires the Session Initiation Protocol Universal Resource Identifier SIP URI of the called user number according to the first query request, the first query request includes the called user number, and the ENUM server of the first IMS network Containing the correspondence between the H code of the called user number, the area code of the place where the called user number is located, and the home network domain name of the place where the called user number is located; The receiving unit is further configured to receive the SIP URI of the called user number sent by the ENUM server of the first IMS network, the SIP URI of the called user number includes the location of the called user number The area code and the home network domain name of the place where the called user number is located; The obtaining unit is further configured to obtain the area code of the place where the called user number belongs from the SIP URI of the called user number. 10. The call routing device according to claim 9, characterized in that, The sending unit is further configured to send a first query request to the ENUM server of the first IMS network if the called user number is a fixed number or a mobile number carrying an area code, so that the first IMS network The ENUM server of the first IMS network obtains the SIP URI of the called user number according to the first query request, and the ENUM server of the first IMS network also includes the area code of the place where the called user number belongs and the called user number The corresponding relationship of the domain name of the network where the number is located; The receiving unit is further configured to receive the SIP URI of the called user number sent by the ENUM server of the first IMS network, the SIP URI of the called user number includes the location of the called user number The area code and the home network domain name of the place where the called user number is located; The obtaining unit is further configured to obtain the home network domain name of the place where the called user number belongs from the SIP URI of the called user number. 11. The call routing device according to claim 9 or 10, characterized in that, The sending unit is further configured to send a second query request to the domain name resolution DNS server of the first IMS network, the second query request includes the home network domain name of the place where the called user number belongs, and the The DNS server includes the corresponding relationship between the domain name of the home network where the called user number belongs to and the IP address of the second IMS network; The receiving unit is further configured to receive and acquire the IP address of the second IMS network sent by the DNS server of the first IMS network. 12. The call routing device according to claim 8, further comprising: a statistical unit; The acquiring unit is further configured to acquire the IP address of the media gateway control network element of the first IMS network; The determining unit is further configured to determine the call type of the call request according to the IP address of the media gateway control network element of the first IMS network; The statistical unit is configured to add the IP address of the call processing network element of the first IMS network to the Record-Route header field if the call type of the call request is a calling transfer call. The call requests to perform service statistics.