WO2012022148A1 - Method and gateway for cross-gateway self-exchange based on session initiation protocol - Google Patents

Abstract

A method and gateway for cross-gateway self-exchange based on Session Initiation Protocol (SIP) are provided in the present invention. The method includes: configuring a number matching table of the related gateways for the calling gateway (S101); when the communication between the access network in which the calling gateway is located and the core network is interrupted and the called number does not belong to the users of the calling gateway, performing, according to the number matching table, the self-exchange call service between the calling gateway and the related gateway through the SIP signaling (S102). In the present invention, the cross-gateway self-exchange service is configured for the access gateways of different manufacturers; once the communication between the core network and the upward service interface of the access network is interrupted, each access gateway can switch to the self-exchange state automatically; not only the self-exchange call service inside the access gateway can be implemented, but also the cross-gateway self-exchange call service among the access gateways can be implemented if the access gateway can communication with other access gateways in the local area network segment; therefore the network resource can be utilized to the maximum extent to ensure the basic communication service among the gateways.

Description

 SIP-based cross-gateway self-switching method and gateway

 The present invention relates to the field of network communication, and in particular, to a method and a gateway for cross-gateway self-switching based on SIP (Session Initiation Protocol). Background technique

 At present, in the NGN (Next Generation Network) or IMS (IP Multimedia Subsystem) system, communication between the access network and the core network is crucial. The service provision of the networked users will not proceed normally.

 The self-switching technology is a protection method when communication interruption occurs when accessing the online service interface. After the self-switching service of the service interface is configured, once the communication interruption occurs on the service interface, the system automatically switches to the self-switching state. If an interface user enters this state, the user in the access network can implement the basic service of the user through the self-switching mode to provide double guarantee for user communication. However, when a service interface is interrupted, if the service interface user dials a user outside the access network, the basic services between users cannot be guaranteed.

In the prior art, although some access devices have implemented internal self-switching functions across gateways, due to the privacy of the interfaces, there is no universality. For example, some manufacturers' access gateways (AGs) have their own numbers. The receiving number and the T network connection enable the communication between the access gateways of each manufacturer to realize the communication between the access gateway users when the communication between the access network and the core network is interrupted, which not only causes resources. Waste, and can not maximize the use of basic services for access gateway users. Summary of the invention

 The main purpose of the present invention is to provide a SIP-based cross-gateway self-switching method and gateway. When communication between the access network and the core network is interrupted, cross-gateway self-switching can be implemented to ensure basic communication between users of different access gateways. business. The invention provides a cross-gateway self-switching method based on an application layer signaling control protocol SIP, which comprises the following steps:

 Configuring a number matching table of the relevant gateway for the calling gateway;

 When the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number does not belong to the calling gateway user, the calling gateway and the related gateway are performed according to the number matching table and through SIP signaling. Self-switched call service.

 Preferably, the step of performing the self-switching call service between the calling gateway and the related gateway according to the number matching table and using SIP signaling specifically includes:

 Finding, from the number matching table, an associated gateway that matches the called number;

 Initiating a call request to the matched related gateway by SIP signaling sequence or in parallel; receiving a response message fed back by the matched related gateway according to the call request; the response message includes: matching the called successful response message or matching The called failure response message;

 And performing, according to the response message, a call connection between the calling gateway and the matched related gateway to complete the calling party and the called party; or, releasing the current call to the calling user.

 Preferably, after the step of searching for the related gateway matching the called number from the number matching table, the method further includes:

 If all relevant gateways do not match the called number, the call is released for the calling user.

Preferably, the step of performing a call connection between the calling gateway and the matched related gateway according to the response message further includes: The call request is initiated three times to the relevant gateway that did not feed back the response message within a predetermined time, and if the waiting timeout occurs, the call is released for the calling user.

 Preferably, after the step of configuring the number matching table of the related gateway for the calling gateway, the method further includes:

 When the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number belongs to the calling gateway user, the call is connected in the calling gateway to complete the calling and calling calls. The invention also proposes a SIP-based cross-gateway self-switching gateway, comprising:

 The configuration module configures a number matching table of the relevant gateway for the calling gateway;

 The self-switching module, when the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number does not belong to the calling gateway user, according to the number matching table, the calling is performed by using SIP signaling. Self-switching call service between the gateway and the relevant gateway.

 Preferably, the self-switching module comprises:

 a searching unit, configured to search, from the number matching table, an associated gateway that matches the called number;

 a call request initiating unit, configured to initiate a call request to the matched related gateway by using SIP signaling sequence or in parallel;

 a receiving unit, configured to receive an answer message that is sent by the matching related gateway according to the call request; the response message includes: matching a called successful response message or matching a called failed response message;

 And an access release unit, configured to perform a call connection between the calling gateway and the matched related gateway according to the response message, to complete a call between the calling party and the called party; or, to release the current call to the calling user.

 Preferably, the access release unit is further configured to release the current call for the calling user when all related gateways do not match the called number.

Preferably, the call request initiation unit is further configured to not feed back the information within a predetermined time The relevant gateway of the response message repeats the call request three times. If the waiting timeout occurs, the access release unit releases the current call for the calling user.

 Preferably, the self-switching module is further configured to: when the access network where the gateway is located and the core network are interrupted, and the called number belongs to the gateway user, perform call connection in the gateway, complete the calling and calling call. The invention provides a SIP-based cross-gateway self-switching method and a gateway, and configures a number matching table between a calling gateway and an associated gateway except the calling gateway, and the access network where the calling gateway is located communicates with the core network. When interrupted, each access gateway can automatically switch to the self-switching state, which can not only realize the self-switching call service inside the access gateway, but also can access each other if the access gateway can communicate with other access gateways in the LAN segment. Gateways can implement self-switching call services across gateways, thereby maximizing the use of network resources and ensuring basic communication services between gateways. DRAWINGS

 1 is a schematic flowchart of an embodiment of a SIP-based cross-gateway self-switching method according to the present invention; FIG. 2 is a schematic diagram of a SIP-based cross-gateway self-switching method according to an embodiment of the present invention, according to a number matching table and calling by SIP signaling. A schematic diagram of a specific process of a self-switched call service between a gateway and a related gateway;

 3 is a schematic flow chart of another embodiment of a SIP-based cross-gateway self-switching method according to the present invention; FIG. 4 is a schematic structural diagram of a SIP-based cross-gateway self-switching gateway according to an embodiment of the present invention; FIG. A schematic diagram of a specific structure of a self-switching module in an embodiment of a gateway self-switching gateway. detailed description

The solution of the embodiment of the present invention is mainly to configure a number matching table between the calling gateway and the related gateway. When the communication between the access network and the core network is interrupted, the number matching table may be searched. The calling number of the calling gateway from the relevant gateway matches the corresponding called number, and the self-exchange call service is implemented across the gateway.

 As shown in FIG. 1 , an embodiment of the present invention provides a method for inter-gateway self-switching based on a SIP (Session Initiation Protocol), including:

 Step S101: Configure a number matching table of the relevant gateway for the calling gateway.

 In this embodiment, the calling gateway and the related gateway may be access gateways that communicate through SIP in the same local area network segment. In this embodiment, the related gateway refers to other access gateways except the calling gateway in the same local area network segment. In order to realize that the communication between the access network and the core network where the calling gateway is located is interrupted, the users in the calling gateway can still perform basic communication services with users in other gateways. First, the other gateways are configured to be associated with the calling gateway. The small number matching table of the gateway (as a part of the number matching table when the communication with the core network is normal), the number matching table should be as accurate as possible, so that the called number can be uniquely determined in other gateways. Or determine in a small scope, and configure the protocol IP address of the corresponding gateway at the same time. Through the number matching table, the matching relationship between the called number of each calling party in the calling gateway and the related gateway can be found, that is, the called number can be uniquely determined in the matching related gateway or can be in a few gateways ( One or more of the small ranges are determined.

 Step S102, when the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number does not belong to the calling gateway user, according to the number matching table, the self-referencing between the calling gateway and the related gateway is performed according to the SIP signaling. Exchange call services.

In this embodiment, the core network may be a core network such as IMS or NGN. When the access network where the calling gateway is located and the core network are interrupted, that is, between the uplink service interface of the access network where the calling gateway is located and the core network. When the communication is interrupted, the calling gateway determines whether the called number is the gateway user according to the called number. If the called number is not the user in the calling gateway, the number matching is performed according to the number matching table, and the SIP is matched. The signaling sequence or in parallel initiates a call request to each of the associated gateway(s) that can match the called number. After the calling gateway waits The response response of each relevant gateway is received until the matching called success response message or the matching called failure response message is received from the relevant gateway, and then corresponding processing is performed according to the response message, or waiting for the timeout to release the current call to the calling user. If the called party matches successfully and the called user is idle, the call is connected between the calling gateway and the matching related gateway to complete the cross-gateway self-switching call service; if the called match fails, the calling user releases the call. .

 As shown in FIG. 2, the self-switching call service between the calling gateway and the related gateway according to the number matching table and the SIP signaling in step S102 includes:

 Step S1021: Search for a related gateway that matches the called number from the number matching table. Step S1022: initiate a call request to the matched related gateway by using SIP signaling sequence or in parallel;

 In this embodiment, each access gateway communicates through SIP signaling. If the calling gateway and the related gateway are in a serial communication mode, the call request may be initiated to the related gateways that can be matched through the SIP signaling. Until the relevant gateway where the called number is located can be confirmed, or all related gateways do not have the called number. If there is a parallel communication mode between the calling gateway and the related gateway, the calling gateway simultaneously initiates a call request to the relevant gateway that can match, and waits for the response response of each matching relevant gateway.

 Step S1023: Receive a response message fed back by the matching related gateway according to the call request. When each matching related gateway receives the call request of the calling gateway, each of the matched gateways performs matching of the called number, and returns a response message to the calling gateway according to the matching result. The response message includes: matching the called success response message or matching the called failure response message.

 If the matching gateway does not feed back the response message within the predetermined time, the calling gateway will repeat the call request three times to the relevant gateway that is not fed back, and if the waiting timeout, release the current call to the calling user.

Step S1024: Perform a call connection between the calling gateway and the matching related gateway according to the response message, and complete the calling and the called call; or, release the current call to the calling user. In this embodiment, after step S1021, the method further includes:

 Step S1025: If all related gateways do not match the called number, the calling user releases the current call.

 In this embodiment, when the communication between the access network and the core network is interrupted, the basic service can be implemented between the users by using a common interface, so that the service provided by the access network user has a more secure guarantee. . As shown in FIG. 3, another embodiment of the present invention provides a method for self-switching across a gateway based on SIP, including:

 Step S301: Configure a number matching table of the relevant gateway for the calling gateway.

 Step S302, when the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number does not belong to the calling gateway user, according to the number matching table, the self-address between the calling gateway and the related gateway is performed through SIP signaling. Exchange call services.

 The above steps S301 and S302 are the same as the steps S101 and S102 in the above embodiment, and will not be described in detail herein.

 Step S303: When the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number belongs to the calling gateway user, the call is connected in the calling gateway to complete the calling and called calls.

 In this embodiment, when the communication between the access network where the calling gateway is located and the core network is interrupted, if the calling gateway determines that the called number in the calling service belongs to the user in the calling gateway, the calling gateway performs the calling gateway. Self-exchange call service, complete the call between the main and the called.

 The following describes the method and method of this embodiment by taking the user communication between four access gateways in one office or network segment as an example:

 If the SIP-based access gateways AG1, AG2, AG3, and AG4 are in the same network segment of the local area network, each gateway configures a specific small number table, that is, a number matching table of the gateways other than the local gateway, and a protocol IP address of the corresponding gateway.

In the initial state, AG1, AG2, AG3, AG4 can communicate with the core network normally, each The call interaction process is completed by communicating with the core network device through the protocol interface.

 When a network failure occurs, AG1, AG2, AG3, and AG4 are all interrupted from communication with the core network, but communication between the AGs is normal. Taking AG 1 as an example, AG 1 is transferred to the self-exchange state.

 The user on the AG1 picks up the phone, and the AG1 puts a dial tone for the user; the user dials; the AG1 receives the number, and the number is matched according to the number matching rule.

 First, AG1 determines whether the called number dialed by the user is the gateway user. If yes, the call is directly connected within the gateway to complete the calling call, until the call ends, and the call is completed; otherwise, if it is not the gateway The user matches the number matching table of the pre-configured AG2, AG3, and AG4, and issues a call request to each of the matching gateways AG according to the matching of the called number with the number matching table of each of the other gateways. If the gateways do not match, the calling party directly calls the calling party, and waits for the calling number to hang up to release the call.

 Assume that the called number matches both AG2, AG3, and AG4. If the communication between AG1 and AG2, AG3 and AG4 is in serial mode, AG1 sends a call request (INVITE) message to the matching gateway in turn until it can confirm the gateway where the called number is located, or all gateways do not have the number. If the communication between AG1 and AG2, AG3 and AG4 is in parallel mode, AG1 simultaneously sends an INVITE message to the remaining gateways.

 After that, AG1 waits for the response message from other gateways. In the waiting state, if it times out, it resends the INVITE message three times to each AG that has not received the reply, and still does not receive the response message, then the network is considered unreachable and the call is released. This call ends.

After receiving the INVITE message, AG2, AG3, and AG4 respectively match the called number, and send a response message to AG1 according to the matching result: If the called number cannot be matched, the AG1 is replied with a message indicating that the called party failed to be called (404Not Found); If the called number can be matched, the normal call flow is entered, and the corresponding response message is returned to the AG1 according to the current called user status: if the called user is busy, the user is replied to the 486Busy Here message that the user is busy; If the user is idle, the user will reply 180 Ringing message to the AG 1, indicating that the called user is idle and using the called party. The user rings.

 The calling gateway AG1 performs corresponding processing according to the response message fed back by each gateway:

 If AG1 receives the 404Not Found message replied by AG2, it knows that the called user is not on AG2, and AG1 checks whether there is still an unanswered gateway. If yes, do not process, continue to wait; otherwise, if each gateway has replied to the 404Not Found message, it is known that the called user is not on all the matching gateways, so AG1 puts a busy tone for the calling number, waiting for the calling number to hang up and release this time. Call, the call ends.

 If AG1 receives the 486 Busy Here reply from AG3, it knows that the called user is on AG3 and is currently busy. AG1 puts a busy tone to the calling number, waits for the calling number to hang up and releases the call, and the call ends. AG1 receives The 180Ringing replied by AG3 knows that the called number is on AG3, so the ringing tone is returned to the calling number and the next step is entered.

 The called user picks up the phone, and AG3 sends an OK to AG1. The calling party and the called party enter the call state, and the calling number will start the call time and enter the call bill until the user hangs up.

 If the calling number hangs up, AG1 sends a BYE message to AG3, and the end time is recorded into the CDR. AG3 receives the BYE message sent by AG1, and sends the busy tone to the called user. The called user hangs up and releases the call. The call ends.

 If the called user hangs up, AG3 sends a BYE message to AG1. AG1 receives the BYE message sent by AG3, puts the busy tone for the calling number, and records the ending call time to the call CDR. The calling number hangs up, the call is released, and the call ends.

 The call CDR is generated by the calling gateway, and can be temporarily stored in the calling gateway or transmitted to the network management or accounting server.

By using the method in the embodiment of the present invention, the access network between different vendors is configured to perform cross-gateway self-switching services at the same time. Once the access to the online service interface is interrupted, the access gateways can automatically switch to the self. The exchange status can not only realize the self-switching call service inside the access gateway, but also if the access gateway can communicate with other access gateways in the LAN segment, Each access gateway implements self-switching call services across gateways, thereby maximizing the use of network resources and ensuring basic communication services between gateways. As shown in FIG. 4, an embodiment of the present invention provides a SIP-based gateway-to-gateway self-switching gateway, including: a configuration module 401 and a self-switching module 402, where:

 The configuration module 401 is configured to configure a number matching table of the related gateways for the calling gateway. In this embodiment, the calling gateway and the related gateway may be access gateways that communicate through SIP in the same local area network segment, which is related to this embodiment. The gateway refers to an access gateway other than the calling gateway in the same LAN segment. In order to realize that the communication between the access network and the core network where the calling gateway is located is interrupted, the users in the calling gateway can still communicate with other gateways. The basic communication service is performed by the user. First, the calling gateway configures the small number matching table of the other access gateway, that is, the related gateway, through the configuration module 401. The number matching table should be as accurate as possible, so that the called number can be uniquely determined in other gateways or Determine in a small scope, and configure the protocol IP address of the corresponding gateway at the same time. Through the number matching table, the matching relationship between the called number of each calling party in the calling gateway and the related gateway can be found, that is, the called number can be uniquely determined in the matching related gateway or can be in a few gateways ( One or more) is determined within a small range.

 The self-switching module 402 is configured to: when the access network where the calling gateway is located and the core network are interrupted, and the called number does not belong to the calling gateway user, according to the number matching table, the calling gateway is related by using SIP signaling. Self-switching call service between gateways.

In this embodiment, when the communication between the access network where the calling gateway is located and the core network is interrupted, that is, when the communication between the uplink service interface of the access network where the calling gateway is located and the core network is interrupted, the calling gateway exchanges itself. The module 402 determines, according to the called number, whether the called number is a gateway user. If the called number is not a user in the calling gateway, the number matching is performed according to the number matching table, and the SIP signaling sequence or parallel is used. A call request is initiated to each of the associated gateway(s) that can match the called number. After that, the calling gateway waits for the response response of each relevant gateway until it receives a matching called success response message from the relevant gateway or fails to match the called party. Answer the message, and then perform corresponding processing according to the response message, or wait for the timeout to release the call to the calling user. If the called party matches successfully and the called user is idle, the call is connected between the calling gateway and the matching related gateway to complete the cross-gateway self-switching call service; if the called match fails, the calling user releases the call. .

 As shown in FIG. 5, the self-switching module 402 includes: a searching unit 4021, a call request originating unit 4022, a receiving unit 4023, and an access releasing unit 4024, where:

 The searching unit 4021 is configured to search for a related gateway that matches the called number from the number matching table, and the call request initiating unit 4022 is configured to initiate a call request to the matched related gateway by using SIP signaling sequence or in parallel;

 The receiving unit 4023 is configured to receive a response message that is sent by the matching related gateway according to the call request. The response message includes: matching the called success response message or matching the called failure response message; and the access release unit 4024 is configured to: according to the response message, The call gateway connects to the matching related gateway to complete the call between the calling party and the called party; or, the calling party releases the current call.

 Further, the access release unit 4024 is further configured to release the current call to the calling user when all related gateways do not match the called number.

 The call request initiation unit 4022 is further configured to repeatedly initiate a call request to the related gateway that does not feed back the response message within a predetermined time. If the waiting timeout occurs, the access release unit releases the current call to the calling user.

 In a further embodiment, the self-switching module 402 is further configured to: when the access network where the gateway is located and the core network are interrupted, and the called number belongs to the gateway user, perform call connection in the gateway to complete the calling call. .

It should be noted that, in the embodiment of the present invention, the core network may be a core network such as IMS or NGN. In the embodiment of the present invention, the access network between different vendors is configured to perform cross-gateway self-switching services at the same time. Once the communication between the access network service interface and the core network is interrupted, each access gateway can automatically switch to the self-switching state, which can not only be implemented. Self-switching call service inside the access gateway, and if The access gateway can communicate with other access gateways in the LAN segment, and can also implement inter-gateway self-switching call services between the access gateways, thereby maximally utilizing network resources and ensuring basic communication services between the gateways.

 The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and equivalent structural or process changes made by the present specification and drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim  A method for self-switching across gateways based on an application layer signaling control protocol SIP, comprising the steps of:  Configuring a number matching table of the relevant gateway for the calling gateway;  When the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number does not belong to the calling gateway user, the calling gateway and the related gateway are performed according to the number matching table and through SIP signaling. Self-switched call service. The method according to claim 1, wherein the step of performing the self-switching call service between the calling gateway and the related gateway according to the number matching table and by using SIP signaling comprises:  Finding, from the number matching table, an associated gateway that matches the called number;  Initiating a call request to the matched related gateway by SIP signaling sequence or in parallel; receiving a response message fed back by the matched related gateway according to the call request; the response message includes: matching the called successful response message or matching The called failure response message;  And performing, according to the response message, a call connection between the calling gateway and the matched related gateway to complete the calling party and the called party; or, releasing the current call to the calling user. The method according to claim 2, wherein the step of searching for the relevant gateway matching the called number from the number matching table further comprises:  If all relevant gateways do not match the called number, the call is released for the calling user. The method according to claim 2, wherein the step of performing a call connection between the calling gateway and the matching related gateway according to the response message further includes Includes:  The call request is initiated three times to the relevant gateway that did not feed back the response message within a predetermined time, and if the waiting timeout occurs, the call is released for the calling user. The method according to any one of claims 1 to 4, wherein the step of configuring the number matching table of the related gateway by the calling gateway further comprises:  When the communication between the access network where the calling gateway is located and the core network is interrupted, and the called number belongs to the calling gateway user, the call is connected in the calling gateway to complete the calling and calling calls. A SIP-based cross-gateway self-switching gateway, wherein the gateway includes: a configuration module, configured to configure a number matching table of the relevant gateway for the calling gateway;  The self-switching module, when the access network where the calling gateway is located is disconnected from the core network, and the called number does not belong to the calling gateway user, the calling gateway is performed by using SIP signaling according to the number matching table. Self-switched call service with related gateways. The gateway according to claim 6, wherein the self-switching module comprises: a searching unit, configured to search, from the number matching table, an associated gateway that matches the called number;  a call request initiating unit, configured to initiate a call request to the matched related gateway by using SIP signaling sequence or in parallel;  a receiving unit, configured to receive an answer message that is sent by the matching related gateway according to the call request; the response message includes: matching a called successful response message or matching a called failed response message; And an access release unit, configured to perform a call connection between the calling gateway and the matched related gateway according to the response message, complete a call between the primary and the called, or release the current call to the calling user. The gateway according to claim 7, wherein the access release unit is further configured to release the call for the calling user when all related gateways do not match the called number. . The gateway according to claim 7, wherein the call request initiating unit is further configured to repeatedly initiate the call request to the relevant gateway that does not feed back the response message within a predetermined time, if the waiting timeout occurs And the call release unit releases the current call for the calling user. The gateway according to any one of claims 6 to 9, wherein the self-switching module is further configured to interrupt communication between the access network where the gateway is located and the core network, and the called number belongs to When the gateway user is in the call, the call is connected in the gateway to complete the calling party and the called party.