CN1997048A - Communication method and redirection device of the terminal in the IP network - Google Patents

Abstract

The invention discloses a method for a terminal to communicate in an IP network. The default media gateway connects to the alternate network for communication. The present invention also discloses a redirection device, comprising: a judging module, connected to an Internet dedicated telephone exchange, for judging whether the terminal can communicate with the Internet telephone exchange when the terminal initiates a communication request via the Internet telephone exchange; The redirection module is connected with the judging module and the terminal. The invention can enable the terminal to communicate through the alternative network without laying telephone lines when the communication with the Internet special telephone exchange fails, thereby greatly simplifying the networking mode, reducing costs and rationally utilizing resources.

Description

Method and redirection device for terminal to communicate in IP network

technical field

The invention relates to a terminal communication method and device, in particular to a terminal communication method and a redirection device in an IP network, belonging to the field of communication.

Background technique

With the gradual realization of the network convergence of transmission data, voice and video, people's understanding of the concept of communication convergence has gradually deepened, and the significance and value of "converged IP communication system" to enterprises is self-evident. Network convergence doesn't just mean cutting phone bills and improving video conferencing. In fact, many organizations are examining how converged networks can be used to improve teamwork and productivity, communicate better with customers, partners and suppliers, Standardize the management of increasingly complex networks and improve network security.

IP Private Branch Exchange (IP-PBX for short) is an enterprise telephone system based on IP network. Unified voice and data network for sites and employees. Compared with the Public Switched Telephone Network (PSTN) network, IP-PBX provides enterprises with a cheaper and more powerful communication solution.

However, when the IP-PBX equipment fails or the IP network is interrupted, the basic call function based on the IP network will not be realized. In the prior art, in order to solve such problems, technical solutions such as power failure escape and network interruption escape are proposed, which are collectively referred to as the escape function here. The escape function is to realize that when the IP-PBX equipment fails or the IP network is interrupted, the terminal can still make calls through the PSTN network.

In the prior art, the method for realizing the above-mentioned escape function is that the terminal comes with an escape port. As shown in Figure 1, the terminal with escape function has an FXO port, which can be connected to the traditional PSTN network through a telephone line. Such a terminal can make calls through the IP network or through the PSTN network. When the IP network connection is interrupted (that is, the terminal cannot communicate with the IP-PBX), the terminal can still make calls through the PSTN network, thereby realizing the escape function.

The disadvantage of this method is that it is inconvenient to form a network when there are a large number of terminals. Each terminal needs to be equipped with telephone lines and network cables at the same time. At the enterprise end, it is also necessary to set up PSTN equipment and VOIP equipment, which not only increases the complexity of the network. The cost is also increased, and resources are also greatly wasted.

Contents of the invention

The purpose of the present invention is to provide a method and a redirection device for a terminal to communicate in an IP network, so that the terminal can communicate with When the communication of the Internet private telephone exchange (IP-PBX for short) fails, it can communicate through the alternative network (such as PSTN network, GSM network, CDMA network, etc.) Reduce costs and rationally utilize resources.

In order to achieve the purpose of the above invention, the present invention provides a method for a terminal to communicate in an IP network, including: when the terminal initiates a communication request via an Internet telephone exchange, judging whether the terminal can communicate with the Internet telephone exchange, if If not, the terminal is connected to the alternative network through the preset media gateway for communication.

In the above technical solution, when the terminal cannot communicate with the Internet private telephone exchange, it communicates with the alternative network through the media gateway, thereby realizing the escape function of the terminal; since the media gateway device can complete the alternative network (such as the PSTN network) , GSM network, CDMA network, etc.) side and IP packet network side media flow conversion, realize the intercommunication between the alternative network and the IP network, and provide seamless interconnection between the alternative network and the IP network. Therefore, through the above technical solution, the terminal only needs to It needs to be connected to the Internet dedicated telephone exchange and media gateway through the network cable and IP network, without the need to set up telephone lines, and the enterprise side only needs to set up VOIP equipment instead of PSTN equipment, which can greatly simplify the networking mode, reduce costs and be reasonable utilize resource.

The above technical solution may specifically include: the terminal pre-saves the IP address of the Internet telephone exchange and the IP address of the media gateway; the terminal uses the IP address of the Internet telephone exchange to send a call request to the Internet telephone exchange, if the terminal receives the If the failure message returned by the Internet telephone exchange or the response message of the Internet telephone cannot be received, it is determined that the terminal cannot communicate with the Internet telephone, and the IP address of the media gateway is used to connect to the Internet through the media gateway. Alternative network for communication.

The above technical solution may also specifically include: the terminal pre-saves the IP address of the media gateway; the terminal uses the IP address of the media gateway to send a request to the media gateway to communicate via an Internet telephone switch; the media gateway receives After the request, it is judged whether the communication link between the terminal and the Internet telephone exchange is interrupted, and if interrupted, the terminal is connected to an alternative network for communication.

The above technical solution may also specifically include: the terminal pre-saves the IP address of the redirecting device; the terminal uses the IP address of the redirecting device to send a call to the redirecting device to communicate via an Internet telephone switch; After the orientation device receives the request, it judges whether the communication link between the terminal and the Internet telephone exchange is interrupted, and if interrupted, returns the IP address of the pre-saved media gateway to the terminal; The IP address of the media gateway is connected to the standby network through the media gateway.

In order to achieve the purpose of the above invention, the present invention also provides a redirection device, including: a judging module, connected to the Internet private telephone exchange, used for judging whether the terminal can communicate with the Internet telephone exchange when the terminal initiates a communication request via the Internet telephone exchange. The Internet telephone exchange for communication; the redirection module is connected with the judgment module and the terminal, and is used to instruct the operation of the terminal according to the judgment result of the judgment module, and instruct the terminal to pass the pre-set when the terminal cannot communicate with the Internet dedicated telephone exchange. The device's media gateway is connected to the alternate network for communication.

In the above-mentioned technical scheme, by setting the judging module in the redirection device to detect whether the Internet private telephone exchange breaks down, and according to the detection result, the redirection module instructs the terminal to conduct communication to the Internet private telephone exchange or the media gateway when it needs to communicate. Communication, so that when the terminal cannot communicate with the Internet private telephone exchange, it can communicate with the alternative network through the media gateway, realizing the escape function of the terminal; and because the media gateway can communicate with the alternative network (such as PSTN network, GSM network, CDMA network, etc.) and IP network to provide seamless interconnection, so the terminal only needs to set up a network cable instead of a telephone line, and the enterprise side only needs to set up a VOIP device instead of a PSTN device, which can greatly simplify the networking method. Reduce costs and rationally utilize resources.

The redirection device can be set in the terminal. The redirecting device may further include a first address storage module connected to the redirection module and configured to pre-save the IP address of the IPBX and the IP address of the media gateway.

The redirection device can also be set in the media gateway. The redirection module is configured to determine whether the communication link between the terminal and the Internet telephone exchange is interrupted after receiving a call sent by the terminal to communicate via the Internet telephone exchange, and if interrupted, send the terminal to the Internet telephone exchange. Connect to an alternate network for communication.

The redirection device can also be independently set in the IP network; the redirection module is used to judge the connection between the terminal and the Internet telephone exchange after receiving a request from the terminal to communicate via the Internet telephone exchange. Whether the communication link between them is interrupted, if interrupted, return the IP address of the media gateway saved in advance to the terminal; the terminal uses the IP address of the media gateway to connect to the standby network through the media gateway.

The judging module may include a detection module, which is connected to the IPBX, and is used to regularly send data packets to the IPBX, so as to detect whether the IPBX fails.

In summary, the present invention enables the terminal to connect to the alternative network via the media gateway for communication when the terminal cannot communicate with the Internet private telephone exchange, so that the alternative network (such as PSTN network, GSM network, The function of seamless connection between CDMA network, etc.) and IP network makes it possible to realize the escape function of the terminal, and at the same time, it only needs to set up a network cable for the terminal instead of a telephone line, which greatly simplifies the networking mode, reduces the cost, and is reasonable efficient use of resources.

Description of drawings

FIG. 1 is a schematic diagram of a network in which a terminal communicates in an IP network in the prior art;

FIG. 2 is a schematic flow diagram of Embodiment 1 of a method for a terminal to communicate in an IP network according to the present invention;

FIG. 3 is a schematic flow diagram of Embodiment 2 of a method for a terminal communicating in an IP network according to the present invention;

FIG. 4 is a schematic flowchart of Embodiment 3 of a method for a terminal communicating in an IP network according to the present invention;

FIG. 5 is a schematic flowchart of Embodiment 4 of a method for a terminal communicating in an IP network according to the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 1 of the redirection device of the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 2 of the redirection device of the present invention;

FIG. 8 is a schematic diagram of a network of Embodiment 3 of a redirection device according to the present invention;

FIG. 9 is a schematic diagram of a network of Embodiment 4 of a redirection device according to the present invention;

FIG. 10 is a schematic diagram of a network of Embodiment 5 of a redirection device according to the present invention.

Detailed ways

The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

The basic idea of the present invention is: in the prior art, when realizing the escape function of the terminal, the terminal needs to arrange telephone lines and network cables at the same time, and PSTN equipment and VOIP equipment also need to be installed at the enterprise end, thereby increasing the complexity of networking and The cost is also a great waste of resources. A method for terminal communication in an IP network and a corresponding redirection device are provided. When the terminal cannot communicate with the Internet dedicated telephone exchange, the call of the terminal is redirected to the preset The media gateway connects the terminal to an alternative network for communication by the media gateway. Since the media gateway can realize the seamless connection between IP network and alternative network (such as PSTN network, GSM network, CDMA network, etc.), the terminal does not need to set up telephone lines but only needs to deploy network cables, and the enterprise side does not need PSTN equipment but only needs to set up VOIP equipment, so that while the terminal communicates in the IP network, it greatly simplifies the networking mode, reduces the cost and rationally utilizes the resources.

Based on the above inventive concept, the present invention provides a method for a terminal to communicate in an IP network. Referring to the flow chart of Embodiment 1 shown in FIG. 2 , first in step 101, when the terminal initiates a , judge whether the terminal can communicate with the preset Internet private telephone exchange, if so, execute step 102, that is, the terminal communicates through the Internet private telephone exchange, and then end; otherwise, execute step 103, that is, the terminal connects to the Internet through the preset media gateway End after the alternate network has communicated.

In the first embodiment, when the terminal cannot communicate with the Internet private telephone exchange, the terminal is connected to the alternative network through the media gateway to communicate, thereby realizing the escape function of the terminal; since the media gateway device can complete the alternative network side and the IP packet The conversion of the media stream on the network side realizes the intercommunication between the alternative network and the IP network, and provides seamless interconnection between the alternative network and the IP network. Therefore, through the above technical solution, the terminal only needs to connect to the Internet private telephone exchange and the Internet through the network cable and the IP network. The media gateway connection does not need to set up telephone lines, and the enterprise side only needs to set up VOIP equipment instead of PSTN equipment, which can greatly simplify the networking mode, reduce costs and rationally utilize resources.

In the first embodiment above, before step 101, the method may further include: the terminal periodically sends data packets to the IPBX to detect whether the terminal can communicate with the IPBX. By regularly sending data packets to the Internet private telephone exchange, the terminal can know in time whether the communication with the Internet private telephone exchange is unimpeded; the step 101 may specifically include: knowing whether the terminal can Communicate with the preset Internet private telephone exchange without sending data packets for detection, so that the delay in communication can be reduced.

Referring to the schematic flowchart of Embodiment 2 of the method for terminal communication in the IP network of the present invention shown in FIG. The IP address of the Internet private telephone exchange set up and the IP address of the media gateway. By saving the IP address of the Internet private telephone exchange and the IP address of the media gateway in advance, the terminal can use the IP address of the Internet telephone exchange to send a call request to the Internet telephone exchange, if the terminal receives the fault returned by the Internet telephone exchange message or the response message from the Internet phone is not received, and it is determined that the terminal cannot communicate with the Internet phone, then use the IP address of the media gateway to connect to an alternative network through the media gateway for communication.

The above-mentioned second embodiment provides an implementation mode in which the terminal itself judges whether it can communicate with the Internet private telephone exchange and selects the corresponding call object. Judgments are made based on the communication status of the terminal, and the terminals do not affect each other. In the third embodiment of the present invention in which the terminal communicates in the IP network, an implementation manner in which the media gateway performs the judgment and selection is further provided below.

Fig. 4 is a schematic flowchart of Embodiment 3 of the method for terminal communication in an IP network according to the present invention, which includes the following steps: first, in step 201, the terminal uses the IP address of the media gateway saved in advance to send a call to the media gateway via the Internet A request for communication by the telephone exchange; then in step 202, after the media gateway receives the request, it is judged whether the communication link between the terminal and the Internet private telephone exchange is interrupted, and if so, step 203 is executed to make the terminal End after connecting to the alternative network for communication; otherwise, execute step 204, that is, the media gateway sends a message including the IP address of the IPBX to the terminal, and then execute step 205, that is, the terminal communicates through the IPBX. In this embodiment, the terminal sends a call message to the preset media gateway when it needs to communicate, and the media gateway judges whether the terminal can communicate with the Internet private telephone exchange. Communication, if communication is not possible, directly connect the terminal to an alternative network for communication.

In the third embodiment above, before step 201, it may further include: the preset media gateway periodically sends data packets to the IPBX to detect whether the IPBX fails. By regularly sending data packets to the Internet private telephone exchange, the media gateway can know in time whether the Internet private telephone exchange breaks down; the step 201 may specifically include: according to the result of detecting whether the Internet telephone exchange breaks down, it is known whether the terminal can communicate with the Internet private telephone exchange The preset Internet private telephone exchange communicates without sending data packets for detection, so that the delay in communication can be reduced.

The third embodiment above may further include: the preset media gateway pre-saves the IP address of the preset Internet-based telephone exchange. If the terminal can communicate with the Internet telephone exchange, the media gateway returns the pre-saved IP address of the Internet telephone exchange to the terminal. The terminal can use the IP address of the Internet telephone exchange returned by the media gateway to initiate a call to the Internet telephone exchange. In addition, the terminal may also store the IP address of the Internet telephone exchange in advance, so the media gateway does not need to send the IP address to the terminal when the terminal and the Internet telephone exchange can communicate.

The third embodiment above provides an implementation mode in which the media gateway judges the state of the Internet private telephone exchange and selects the call object when the terminal communicates. The advantage of this implementation mode is that it does not need to modify the functions of the terminal, and a media gateway Multiple terminals can be supported, thereby facilitating implementation; but compared to the implementation mode in which the terminal itself performs the judgment and selection operation in the above-mentioned embodiment 2, the implementation mode provided in the above-mentioned embodiment 3 can only judge whether an Internet private telephone exchange has occurred If there is a failure, it cannot be judged whether the communication link between the Internet private telephone exchange and the terminal fails, and when the media gateway fails, it will affect the escape function of multiple terminals. The following further provides an implementation manner in which the judging and selecting operations are performed by a redirecting device independently installed in the IP network.

Fig. 5 is a schematic flowchart of Embodiment 4 of the method for terminal communication in an IP network according to the present invention, which includes the following steps. First, in step 301, the terminal sends a call to the redirection device by using the IP address of the redirection device saved in advance. Internet telephone exchange request for communication; then in step 302, after receiving the request, the redirecting device judges whether the communication link between the terminal and the Internet private telephone exchange is interrupted, and if so, executes the step Step 303 is to send a message including the IP address of the media gateway to the terminal, and then execute step 304, that is, the terminal is connected to an alternative network through the preset media gateway to complete the communication; otherwise, execute step 305 to send a message including The message of the IP address of the Internet private telephone exchange, and then execute step 306, that is, the terminal communicates through the Internet private telephone exchange.

In the fourth embodiment above, before step 301, it may further include: the redirection device periodically sends data packets to the Internet private telephone exchange for detecting whether the Internet private telephone exchange fails. By regularly sending data packets to the Internet private telephone exchange, the redirecting device can know in time whether the Internet private telephone exchange breaks down; the step 301 may specifically include: according to the result of detecting whether the Internet telephone exchange breaks down, it is known whether the terminal can Communicate with the preset Internet private telephone exchange without sending data packets for detection, so that the delay in communication can be reduced.

The fourth embodiment above may further include: the redirecting device pre-saves the preset IP address of the IPBX and the IP address of the media gateway. If the terminal can communicate with the Internet telephone exchange, the redirection device returns the IP address of the Internet telephone exchange stored in advance to the terminal. The terminal can use the IP address of the Internet telephone exchange returned by the redirection device to initiate a call to the Internet telephone exchange. The terminal can also store the IP address of the Internet telephone exchange in advance, so the redirection device does not need to send the IP address to the terminal when the terminal and the Internet telephone exchange can communicate.

The fourth embodiment above provides an implementation in which the redirection device judges the state of the Internet private telephone exchange and selects the call object when the terminal communicates. The advantage of this implementation is that it does not need to modify the functions of the terminal or the media gateway. And one redirecting device can support multiple terminals, thus facilitating implementation. However, compared to the embodiment in which the terminal itself performs the judgment and selection operation in the second embodiment above, the embodiment provided in the fourth embodiment can only judge whether the IPBX is out of order and cannot judge whether the IPBX is connected to the terminal. Whether the communication link between them fails, and when the redirection device fails, it will affect the escape function of multiple terminals.

The above-mentioned embodiments 1 to 4 provide various implementations of the method for the terminal to communicate in the IP network of the present invention, and respectively explain the advantages and disadvantages of the various implementations. Those skilled in the art can flexibly select the method according to the actual application scenario. The above-mentioned implementation modes, or a combination of the above-mentioned implementation modes, should all be within the scope of protection claimed by the technical solution of the present invention.

Optionally, in the method for the terminal to communicate in the IP network provided by the present invention, the interaction between the terminal and the media gateway, and between the terminal and the redirection device can be performed through the SIP protocol. The following is a brief description of the SIP protocol:

SIP (Session Initiation Protocol) was developed to help provide advanced telephony services across the Internet. As an application layer control (signalling) protocol for multimedia communication, the SIP protocol can establish, change and terminate multimedia sessions. There are two main components in the SIP protocol: the user agent (UA) and the web server. The user agent (UA) is further divided into a user agent client (UAC) that initiates a SIP request and a user agent server (UAS) that responds to such a request. Web servers are further divided into: redirection servers, proxy servers, and registration servers.

Typical SIP operation involves a SIP User Agent Client (UAC) making a request, a SIP Proxy Server acting as a location discovery agent for the end user and a User Agent Server (UAS) accepting the call. A successful SIP invitation includes two request messages: INVITE message and ACK message. When a user wishes to call another user, the caller uses INVITE to request an initial call, and the request contains sufficient information for the called party to participate in the session.

The redirect server receives requests, but instead of passing them on to the next server, it sends a response to the caller indicating the address of the called user. This allows the caller to directly contact the called party's address on the next server. The redirection server processes the INVITE message by sending back a SIP-URL (SIPUniform Resource Locations, SIP uniform resource location, such as: sip:user@host.domain) containing the location of the callee. The proxy server completes the application layer routing of SIP requests and responses. The registration server is used to record the user's SIP-URL address information and its corresponding IP address information.

There are two types of SIP messages: request messages from the client to the server and response messages from the server to the client.

SIP defines the following methods:

INVITE - Invites the user to join a call.

BYE - Terminates a call between two users on a call.

OPTIONS - Request information about server capabilities.

ACK - Acknowledgment that the client has received the final response to the INVITE.

REGISTER - Provides a mapping of address resolution, allowing the server to know where other users are.

INFO - used for in-session signaling.

The following is an example of the communication process between the terminal and the redirecting device through the SIP protocol:

The terminal sends an INVITE message to the redirecting device. After receiving the INVITE message from the terminal, the redirecting device first judges whether the IPPBX fails. If the Internet private telephone exchange does not fail, it returns a redirection response (3xx) message to the terminal, wherein The Contact header field value is the address of IPPBX, so that the terminal will send an INVITE message to IPPBX to initiate a normal call after receiving the message; if the IPPBX fails, the redirection device will reply to the terminal in the redirection response (3XX) message The value of the Contact header field is the address of the media gateway, so that after receiving the response message, the terminal will send an INVITE message to the media gateway for communication.

Based on the above inventive concept, the present invention also provides a redirection device. Referring to the schematic structural diagram of Embodiment 1 shown in FIG. When initiating a request for communication via the Internet telephone exchange, it is judged whether the terminal can communicate with the Internet telephone exchange; the redirection module 5 is connected with the judgment module 4 and the terminal, and is used to: instruct the terminal according to the judgment result of the judgment module The operation of instructing the terminal to connect to the alternative network through the preset media gateway for communication when the terminal cannot communicate with the Internet private telephone exchange.

In the present embodiment one, by setting judgment module 4 in the redirecting device, detect whether the Internet private telephone exchange breaks down, and instruct the terminal to send Internet special telephone exchange or media to the Internet private telephone exchange or the media according to the detection result by redirection module 5. The gateway communicates, so that when the terminal cannot communicate with the Internet private telephone exchange, it can communicate with the alternative network through the media gateway, realizing the escape function of the terminal; and because the media gateway can communicate between the alternative network and the IP network Provide seamless interconnection, so the terminal only needs to set up the network cable instead of the telephone line, and the enterprise side only needs to set up the VOIP device instead of the PSTN device, which can greatly simplify the networking method, reduce the cost and make reasonable use of resources.

Referring to the schematic structural diagram of the second embodiment shown in Figure 7, the difference from the first embodiment is that the judging module 4 includes a detection module 41, which is connected to the dedicated Internet telephone exchange, and is used to regularly report to the dedicated Internet telephone exchange. A data packet is sent to detect whether the Internet private telephone exchange fails. By regularly sending data packets to the Internet private telephone exchange, the media gateway can know in time whether the Internet private telephone exchange fails, and can make a judgment based on the previously known information in the judgment operation when communication is required, without sending data again Packet detection, which can reduce the communication delay.

The redirection device provided by the present invention can be set in a terminal or a media gateway according to requirements of actual application scenarios, or set independently in an IP network.

The redirecting device can be set in the terminal, so that the terminal itself can judge whether it can communicate with the Internet private telephone exchange and select the corresponding calling object. The advantage of this embodiment is that it can accurately judge the communication status between the terminal and the Internet private telephone exchange, and the terminals do not affect each other. Referring to the schematic diagram of the networking of the third embodiment of the redirection device of the present invention shown in FIG. The IP address of the Internet private telephone exchange 1 is stored in advance. The third embodiment above provides an embodiment in which the redirection device is set in the terminal, and the terminal itself judges whether it can communicate with the IPBX and selects the corresponding call object.

The redirection device can also be set in the media gateway, so that when the terminal communicates, the media gateway can judge the state of the Internet private telephone exchange and select the implementation mode of the call object. Transformation, and a media gateway can support multiple terminals, which facilitates implementation. Referring to the schematic diagram of the network of the fourth embodiment of the redirection device of the present invention shown in FIG. 9, the redirection device 3 is set in the media gateway 6. After the sent call requests for communication via the Internet telephone exchange, it is judged whether the communication link between the terminal and the Internet telephone exchange is interrupted, and if interrupted, the terminal is connected to an alternative network for communication; redirection means 3 may also include an address saving module 8, which is connected to the redirection module 5, and is used to pre-save the IP address of the Internet private telephone exchange 1. Compared with the embodiment in which the terminal itself performs the judgment and selection operation in the third embodiment above, the embodiment provided in the fourth embodiment can only judge whether the IPBX is out of order and cannot judge whether the IPBX is connected to the terminal. Whether the communication link between them fails, and when the media gateway fails, it will affect the escape function of multiple terminals.

The redirecting device can also be independently set in the IP network to perform the implementation of the judgment and selection operation. FIG. 10 is a schematic diagram of the networking of Embodiment 5 of the redirection device of the present invention. The redirection device 3 is independently set in the IP network; the difference from the first embodiment above is that the redirection module is used to receive the After calling a request for communication via the Internet telephone exchange, it is judged whether the communication link between the terminal and the Internet telephone exchange is interrupted, and if interrupted, the IP address of the media gateway saved in advance is returned to the terminal; the terminal Utilize the IP address of described media gateway to be connected to standby network through described media gateway; Redirection device 3 can also comprise address preservation module 8, be connected with redirection module 5, be used for preserving the IP address of Internet private telephone exchange 1. The fifth embodiment above provides an embodiment in which the redirection device is independently set in the IP network, so that the redirection device can judge the state of the Internet private telephone exchange and select the call object when the terminal communicates. The advantages of this embodiment The reason is that there is no need to modify the functions of terminals or media gateways, and one redirection device can support multiple terminals, which is convenient for implementation; but compared to the implementation mode in which the terminal itself performs the judgment and selection operations in the third embodiment , the implementation provided by the above-mentioned fifth embodiment can only judge whether the Internet private telephone exchange fails and cannot judge whether the communication link between the Internet private telephone exchange and the terminal fails, and when the redirection device fails, multiple terminals will be affect the escape function.

The above-mentioned embodiments of the redirection device of the present invention provide various implementations of the redirection device of the present invention, and respectively explain the advantages and disadvantages of various implementations. Those skilled in the art can flexibly select the above-mentioned redirection device according to the actual application scenario. The implementation manner, or the combination of the above implementation manners, shall be within the scope of protection claimed by the technical solution of the present invention.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit understanding of the present invention. Although the present invention has been described in detail with reference to the above-mentioned preferred embodiments, those skilled in the art should understand that: it can still modify or replace the technical solution of the present invention, and such modification or replacement does not depart from the technology of the present invention. The spirit and scope of the programme.

Claims (12)

1, a kind of terminal method for communicating in IP network, it is characterized in that, comprise: when request that terminal is initiated to communicate via the Internet Protocol telephone switch, judge whether terminal can communicate with described Internet Protocol telephone switch, if could not described terminal would be connected to alternative network by default media gateway communicates.

2, method according to claim 1 is characterized in that, described method specifically comprises:

Terminal is preserved the IP address of Internet Protocol telephone switch and the IP address of media gateway in advance; Described terminal utilizes the IP address of described Internet Protocol telephone switch to send call request to described Internet Protocol telephone switch, if terminal receives failure message that described Internet Protocol telephone switch returns or the response message that can't accept described Internet Telephone, determine that this terminal and described Internet Telephone can not communicate, then utilize the IP address of described media gateway to be connected to alternative network and communicate by described media gateway.

3, method according to claim 1 is characterized in that, described method specifically comprises:

Terminal is preserved the IP address of media gateway in advance; Described terminal utilizes the IP address of described media gateway to send the request that communicates via the Internet Protocol telephone switch of calling out to described media gateway; After described media gateway receives described request, judge whether the communication link between described terminal and the described Internet Protocol telephone switch interrupts, communicate if interrupt then described terminal is connected to alternative network.

4, method according to claim 1 is characterized in that, described method specifically comprises:

Terminal is preserved the IP address of redirection device in advance; Described terminal utilizes the IP address of described redirection device to send the request that communicates via the Internet Protocol telephone switch of calling out to described redirection device; After described redirection device receives described request, judge whether the communication link between described terminal and the described Internet Protocol telephone switch interrupts, if interrupt then return the IP address of the media gateway of preserving in advance to described terminal; Described terminal utilizes the IP address of described media gateway to be connected to backup network by described media gateway.

5, according to claim 1,3 or 4 each described methods, it is characterized in that:

Judge that described terminal also comprises periodically to described Internet Protocol telephone switch transmission packet before whether can communicating with default Internet Protocol telephone switch, is used to detect the Internet private telephone exchange and whether breaks down;

Describedly judge whether terminal can communicate specifically with default the Internet private telephone exchange and comprise: know according to the result whether described detection Internet Protocol telephone switch breaks down whether terminal can communicate with default the Internet private telephone exchange.

6, according to claim 3 or 4 described methods, it is characterized in that described method also comprises:

If described terminal and Internet Protocol telephone exchange function communicate, described media gateway or described redirection device return the IP address of the Internet Protocol telephone switch of preserving in advance to described terminal.

7, a kind of redirection device is characterized in that, comprising:

Judge module is connected with the Internet private telephone exchange, is used for judging whether terminal can communicate with described Internet Protocol telephone switch when request that terminal is initiated to communicate via the Internet Protocol telephone switch;

Redirection module, be connected with described judge module and described terminal, be used for the operation according to the judged result indicating terminal of judge module, indicating terminal is connected to alternative network by default media gateway and communicates when terminal can not communicate with the Internet private telephone exchange.

8, device according to claim 7 is characterized in that:

Described redirection device is arranged in the described terminal;

Described redirection device also can comprise first address preservation module, is connected with described redirection module, is used for preserving in advance the IP address of described the Internet private telephone exchange and the IP address of described media gateway.

9, device according to claim 7 is characterized in that:

Described redirection device is arranged in the described media gateway;

Described redirection module is used for after the request that the calling that receives the terminal transmission communicates via the Internet Protocol telephone switch, judge whether the communication link between described terminal and the described Internet Protocol telephone switch interrupts, communicate if interrupt then described terminal is connected to alternative network.

10, device according to claim 7 is characterized in that:

Described redirection device is arranged in the IP network independently;

Described redirection module is used for after the request that the calling that receives the terminal transmission communicates via the Internet Protocol telephone switch, judge whether the communication link between described terminal and the described Internet Protocol telephone switch interrupts, if interrupt then return the IP address of the media gateway of preserving in advance to described terminal; Described terminal utilizes the IP address of described media gateway to be connected to backup network by described media gateway.

11, according to claim 7,9 or 10 arbitrary described devices, it is characterized in that: described judge module comprises detection module, be connected with described the Internet private telephone exchange, be used for periodically sending packet, whether break down to detect described the Internet private telephone exchange to described the Internet private telephone exchange.

12, according to claim 9 or 10 described devices, it is characterized in that: described redirection device also comprises second address preservation module, is connected with described redirection module, is used for preserving in advance the IP address of described the Internet private telephone exchange.

Images