CN102932319A - Method and device for keeping calling - Google Patents
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- CN102932319A CN102932319A CN2011102316607A CN201110231660A CN102932319A CN 102932319 A CN102932319 A CN 102932319A CN 2011102316607 A CN2011102316607 A CN 2011102316607A CN 201110231660 A CN201110231660 A CN 201110231660A CN 102932319 A CN102932319 A CN 102932319A
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Abstract
The invention provides a method and a device for keeping calling. When a voice gateway VGW-1 detects that when an SIP server connected with the VGW-1 fails, an INVIT message comprising a Session-ID can be generated for each effective calling, the value of the Session-ID is same as that of each effective calling, and the generated INVIT message is sent to a standby SIP server; and when a voice gateway VGW-2 receives the INVIT message from the standby SIP server, the voice gateway VGW-2 can judge whether the Session-ID value in the INVIT message is same with that of a certain current effective calling, and if so, a 200OK message is responded to the standby SIP server. By using the method, when the SIP server fails, a condition that the calling is end caused by failed message sending in the calling can be avoided, the calling between two terminal users can be kept all the time until that the terminal users self finish the calling.
Description
Technical field
The present invention relates to communication network, relate in particular to the method and apparatus for the treatment of conversation in the communication network.
Background technology
In the NGN network, as voice gateways (Voice GateWay, when VGW) detecting coupled sip server and break down, voice gateways can switch to all business on it on sip server of backup, at present, most of voice gateways can be removed all permissible calls on it, and then the sip server to backup re-registers the terminal use.But, remove all permissible call meetings and cause termination of a call, bring great inconvenience to the user, and have a strong impact on the business of company, thereby operator generally all wishes can keep current conversation when sip server breaks down.
For this reason, known a solution is at present, and when sip server broke down, voice gateways for permissible calls all on the voice gateways, kept its media path except the sip server to backup re-registers the terminal use.Because the media path of calling out is not eliminated, thereby the conversation between the terminal use is unaffected.But, for the message (in-dialogue message) in the dialogue, still can be sent to the sip server that breaks down such as the re-INVITE message that needs to use in the value-added services such as session refreshing message (session refresh message) and call hold service, call waiting, teleconferencing service, at this moment, owing to the current conversation of signaling failure will be terminated.
Fig. 1 illustrates a flow chart according to above-mentioned prior art.As shown in Figure 1, wherein, user A is by voice gateways VGW-1 access network, and user B is by voice gateways VGW-2 access network, voice gateways VGW-1 communicates by letter with voice gateways VGW-1 by sip server P, and sip server P ' is the backup server of sip server P.
Step S101 is the SIP session establishment process of standard to step S108 among Fig. 1, execution of step S108, and the session establishment between user A and the user B, user A can converse with user B.
In the communication process, sip server P breaks down and can't work, and when voice gateways VGW-1 detected this fault, its meeting execution in step S109 was for all terminal uses under its administration register to backup sip server P '.Simultaneously, voice gateways VGW-1 can keep the media path of current permissible call all on it, and therefore, the conversation of user A and user B is unaffected.
After a while, voice gateways VGW-1 sends re-INVITE message, this re-INVITE message may be caused by session refreshing, also might be to be caused by the value-added service (such as call hold service, call waiting, teleconferencing service etc.) in calling out.This re-INVITE message still can send to the sip server P that breaks down, shown in step S111, this is because the value of request-URI field in this re-INVITE message equals the value of the Contact header field in the 200OK message among the step S106, also is the ident value of sip server P.Obviously, this re-INVITE message can be failed, and voice gateways VGW-1 can retransmit re-INVITE message, shown in step S112.Still in the failed situation, shown in step S 113, voice gateways VGW-1 can send BYE message and stop this session, and the removing Media Stream after when retransmitting one section, and like this, the conversation meeting between user A and the user B stops thereupon.
This shows; when sip server breaks down; adopt the method for prior art; although can keep to a certain extent user's conversation unaffected; but the failed situation of some signaling message appearance in the communication process can appear; thereby cause termination of a call, protection user's that can not be absolute conversation is unaffected.
Summary of the invention
The present invention has proposed a kind of method and apparatus in order to solve defects of the prior art.
According to a first aspect of the invention, a kind of method that is used for keeping conversation in voice gateways is provided, when voice gateways detect coupled server and break down, said method comprising the steps of: a. is for each permissible call, generate a new session setup request message, the value of sign that is used for end-to-end unique identification conversation in the described message is identical with the value of the sign that is used for end-to-end unique identification conversation of described permissible call, and the value that is used for the media parameter that description converses of value and described permissible call of media parameter that is used for describing conversation in the described message is identical; B. send described session setup request message to backup server.
Preferably, described session setup request message is initial INVITE message, and described media parameter for describing conversation is the SDP parameter.
Preferably, the described Session-ID that is designated for end-to-end unique identification conversation.
According to a second aspect of the invention, provide a kind of method that is used for keeping conversation in voice gateways, said method comprising the steps of: c. receives the new session setup request message from server; D. the value of judging in the described message sign that the is used for end-to-end unique identification conversation whether value with the sign that is used for end-to-end unique identification conversation of certain current permissible call is identical; If e. sentence read result is identical, send the conversation request of setting up to described server and reply message, wherein comprised described sign for end-to-end unique identification conversation.
Preferably, described session setup request message is initial INVITE message, and it is 200OK message that message is replied in the described conversation request of setting up.
Preferably, the described Session-ID that is designated for end-to-end unique identification conversation.
According to a third aspect of the invention we, a kind of device that is used for keeping conversation in voice gateways is provided, described device comprises: message creating apparatus, be used for when voice gateways detect coupled server and break down, generate a new session setup request message for each permissible call, the value of sign that is used for end-to-end unique identification conversation in the described message is identical with the value of the sign that is used for end-to-end unique identification conversation of described permissible call, and the value that is used for the media parameter that description converses of value and described permissible call of media parameter that is used for describing conversation in the described message is identical; The first dispensing device is used for sending described session setup request message to backup server.
Preferably, described session setup request message is initial INVITE message, and described media parameter for describing conversation is the SDP parameter.
Preferably, the described Session-ID that is designated for end-to-end unique identification conversation.
According to a forth aspect of the invention, provide a kind of device that is used for keeping conversation in voice gateways, described device comprises: receiving system is used for receiving the new session setup request message from server; Judgment means is used for judging described message being used for the value of sign of end-to-end unique identification conversation the value with the sign that is used for end-to-end unique identification conversation of certain current permissible call being identical; The second dispensing device is used for replying message when the sentence read result of judgment means sends the conversation request of setting up to described server when being identical, has wherein comprised the described sign of conversing for end-to-end unique identification.
Preferably, described session setup request message is initial INVITE message, and it is 200OK message that message is replied in the described conversation request of setting up.
Preferably, the described Session-ID that is designated for end-to-end unique identification conversation.
The method and apparatus of the application of the invention when sip server breaks down, can not occur sending the situation that unsuccessfully causes termination of a call because of the message in the conversation.Conversation meeting between the terminal use keeps always, until terminal use oneself stops this conversation.Therefore, the conversation between the terminal use is unaffected, has improved the performance of system.
Description of drawings
By reading the detailed description of non-limiting example being done referring to accompanying drawing, it is more obvious that other features, objects and advantages of the present invention will become.
Fig. 1 is the schematic diagram according to the processing procedure of the maintenance conversation of prior art;
Fig. 2 is the method flow schematic diagram that is used for keeping conversation according to a specific embodiment of the present invention;
Fig. 3 is the process schematic diagram that is used for keeping conversation according to a specific embodiment of the present invention;
Fig. 4 is the structured flowchart according to the device that is used for the maintenance conversation in voice gateways of a specific embodiment of the present invention;
Fig. 5 is the structured flowchart according to the device that is used for the maintenance conversation in voice gateways of a specific embodiment of the present invention.
Embodiment
Basic thought of the present invention is: when sip server breaks down, for each permissible call, voice gateways will be set up a new conversation by the sip server of backup, be used for replacing original conversation.
The below describes the present invention in detail with reference to each accompanying drawing.
Fig. 2 shows the method flow schematic diagram that is used for keeping conversation according to a specific embodiment of the present invention.Wherein, voice gateways VGW-1, voice gateways VGW-2 link to each other with sip server P, and sip server P ' is the backup server of sip server P.
When voice gateways VGW-1 detected coupled sip server P and breaks down, as described in the background art, voice gateways VGW-1 can send Register message to backup sip server P ', register all terminal uses under its administration.
Simultaneously, voice gateways VGW-1 meeting execution in step S201 is to step S202.
In step S201, for each permissible call, voice gateways VGW-1 can generate a new session setup request message.Comprise a sign that is used for end-to-end unique identification conversation in this session setup request message, the value of this sign is identical with the value that is used for arriving the sign of holding unique identification conversation of described permissible call; Value for the media parameter of describing conversation in this message is identical with the value for describing the media parameter of conversing of described permissible call.
In one embodiment, described session setup request message is initial INVITE message, and described media parameter for describing conversation is the SDP parameter.SDP (Session Description Protocol) is Session Description Protocol, and which type of host-host protocol, the coded system of conversation employing, IP address and port, the packing manner etc. of conversation are adopted in the conversation that is used for describing between two terminals.Therefore, the SDP parameter is a set that comprises a plurality of parameters normally, can comprise the medium property that the SDP parameter is used for describing conversation in INVITE.
In one embodiment, describedly be designated Session-ID (conversation identifier) for end-to-end unique identification conversation.Session-ID defines in the draft-kaplan-sip-session-id-02.txt file of IETF tissue issue.Session-ID is distributed by voice gateways at first, is used for conversation of end-to-end unique identification, and the whole network is unique, and be not changed through B2BUA (Back to Back User Agent, back-to-back user agent) time.Sip server P and backup sip server P ' are B2BUA.
Then, voice gateways VGW-1 can send to backup sip server P ' INVITE of above-mentioned generation, shown in step S202.Cause network congestion excessive with backup sip server P ' load for fear of sending simultaneously a large amount of INVITE, voice gateways VGW-1 can select random delay to send above-mentioned INVITE.
Backup sip server P ' is after receiving above-mentioned session setup request message, and processing procedure is identical with processing at ordinary times.The destination of supposing one of them session setup request message is voice gateways VGW-2, and backup sip server P ' can send this session setup request message to voice gateways VGW-2.
In voice gateways VGW-2 one side, its with execution in step S203 to step S205.
Shown in step S203, voice gateways VGW-2 receives the new session setup request message from backup sip server P '.In one embodiment, described session setup request message is initial INVITE message.
Then, in step S204, the value that voice gateways VGW-2 can judge in this message the sign that the is used for end-to-end unique identification conversation whether value with the sign that is used for end-to-end unique identification conversation of certain current permissible call is identical.In one embodiment, the described Session-ID that is designated for end-to-end unique identification conversation.The value that voice gateways VGW-2 can judge Session-ID in this INVITE whether value with the Session-ID of current certain permissible call is identical.
If judged result is identical, in step S205, voice gateways VGW-2 can send the conversation request of setting up to backup sip server P ' and reply message, replys in the message at this, has comprised the above-mentioned sign that is used for end-to-end unique identification conversation subsequently.In one embodiment, described session setup request message is initial INVITE message, and it is 200OK message that message is replied in the described conversation request of setting up.In one embodiment, the described Session-ID that is designated for end-to-end unique identification conversation.
Backup sip server P ' is after receiving above-mentioned 200OK message, and it can send 200OK message to voice gateways VGW-1.So far, new conversation is set up between voice gateways VGW-1 and voice gateways VGW-2, and via backup sip server P ', new conversation will be replaced original conversation, and owing to signaling paths upgrades, message can both transmit smoothly in the various dialogues, and various supplementary services can both continue to use, thereby the conversation between the terminal use is unaffected.
Fig. 3 shows the process schematic diagram that is used for keeping conversation according to a specific embodiment of the present invention.Wherein, user A is by voice gateways VGW-1 access network, and user B is by voice gateways VGW-2 access network, and voice gateways VGW-1 communicates by letter with voice gateways VGW-1 by sip server P, and sip server P ' is the backup server of sip server P.
Step S301 is the SIP session establishment process of standard to step S308 among Fig. 3, execution of step S308, and the session establishment between user A and the user B, user A can converse with user B.Can find out that the value of the Session-ID that converses between user A and user B is SID-1, through above-mentioned steps, it is also selected to be used for describing the SDP parameter of conversing between user A and the user B.
In the communication process, sip server P breaks down and can't work, and when voice gateways VGW-1 detected this fault, its meeting execution in step S309 was for all terminal uses under its administration register to backup sip server P '.Simultaneously, voice gateways VGW-1 can keep the media path of current permissible call all on it, and therefore, the conversation of user A and user B is unaffected.
Then, for the conversation between user A and the user B, voice gateways VGW-1 can generate a new session setup request message, such as the initial INVITE message shown in the step S311 among the figure.Can see, the value of Call-ID field is 2a in this INVITE, and the value of Call-ID field is 1a in above-mentioned step S301 and step S304, this is because for a new initial INVITE message, voice gateways VGW-1 can distribute a different Call-ID, be used for representing that this INVITE is a new initial INVITE message, rather than the message (in-dialogue message) in the dialogue of an existing conversation.Thereby said new initial INVITE message in this refers to that the value of Call-ID field in this INVITE is different from the value of the Call-ID field of existing conversation.
In this INVITE, comprise a sign that is used for end-to-end unique identification conversation, such as Session-ID, the value of the Session-ID that converses between the value of this Session-ID and user A and the user B is identical, and namely the value of Session-ID is SID-1 in this INVITE.Also comprise in this INVITE for the media parameter of describing conversation, such as the SDP parameter, wherein the value of SDP parameter is identical with the value that is used for the SDP parameter of current talking between description user A and the user B.
Then, voice gateways VGW-1 can send to backup sip server P ' INVITE of above-mentioned generation, shown in step S311.
Backup sip server P ' is after receiving above-mentioned INVITE, processing procedure is identical with processing procedure of the prior art, it can send INVITE to voice gateways VGW-2, shown in step S312, wherein the value of Session-ID is SID-1, and the value of SDP parameter is identical with the value of the SDP parameter of current talking.
Voice gateways VGW-2 receives the new session setup request message from backup sip server P ', than initial INVITE message described above, shown in step S312.
Then, voice gateways VGW-2 can read the value of the sign that is used for end-to-end unique identification conversation in the INVITE that receives, such as the value of Session-ID, and whether the value of judging this Session-ID is identical with the value of Session-ID of certain permissible call under its administration.
The value of the Session-ID that reads is SID-1, through relatively judging, the value of the Session-ID that converses between the value of this Session-ID and user A and the user B is identical, voice gateways VGW-2 learns that thus this conversation is not a new conversation, but existing conversation, the other side's voice gateways may be run into the sip server fault, wish to keep existing conversation unaffected by rebuliding a new conversation in the mode of replacing existing conversation.
Then, in step S313, voice gateways VGW-2 sends the conversation request of setting up to backup sip server P ' and replys message, such as the 200OK message shown in the figure, in this message, comprised above-mentioned Session-ID, its value is SID-1, and wherein the value of SDP parameter is identical with the value of the SDP parameter of current talking.
Backup sip server P ' is after receiving above-mentioned 200OK message, processing procedure is identical with processing procedure of the prior art, it can send 200OK message to voice gateways VGW-1, shown in step S314 among the figure, wherein the value of Session-ID is SID-1, and the value of SDP parameter is identical with the value of the SDP parameter of current talking.
Then, in step S315, voice gateways VGW-1 sends ACK message to backup sip server P ', and wherein the value of Session-ID is SID-1.
Then, in step S316, backup sip server P ' sends ACK message to voice gateways VGW-2, and wherein the value of Session-ID is SID-1.
So far, conversation new between user A and the user B is set up between voice gateways VGW-1 and voice gateways VGW-2, and via backup sip server P ', new conversation will be replaced original conversation between user A and the user B, thereby the conversation between user A and the user B is unaffected.
In step S317, voice gateways VGW-1 can send re-INVITE message, this re-INVITE message may be caused by session refreshing, also might be to be caused by the value-added service (such as call hold service, call waiting, teleconferencing service etc.) in calling out.This re-INVITE message can not send to the sip server P that breaks down, but can send to backup sip server P ', this is because the value of request-URI field in this re-INVITE message equals the value of the Contact header field in the 200OK message among the step S314, also namely backs up the ident value of sip server P '.Therefore, different with prior art, failed situation can not appear sending in this re-INVITE message, and signalling route information has also been upgraded in the dialogue, and the conversation between user A and the user B is unaffected.After backup sip server P ' receives above-mentioned re-INVITE message, process identically with prior art, thereby step S318 is prior art to step S322, repeats no more herein.
This shows that the method according to this invention can not occur sending the situation that unsuccessfully causes termination of a call because of the message in the conversation, adopt method of the present invention, when sip server broke down, the conversation between the terminal use can keep always, until user oneself stops this conversation.
Fig. 4 shows the structured flowchart according to the device that is used for the maintenance conversation in voice gateways VGW-1 of a specific embodiment of the present invention.In Fig. 4, this device 400 comprises message creating apparatus 401 and the first dispensing device 402.
Below in conjunction with Fig. 2, elaborate to installing 400 the course of work.
When voice gateways VGW-1 detected coupled sip server P and breaks down, as described in the background art, voice gateways VGW-1 can send Register message to backup sip server P ', register all terminal uses under its administration.
Simultaneously, for each permissible call, message creating apparatus 401 can generate a new session setup request message.Comprise a sign that is used for end-to-end unique identification conversation in this session setup request message, the value of this sign is identical with the value of the sign that is used for end-to-end unique identification conversation of described permissible call; Value for the media parameter of describing conversation in this message is identical with the value for describing the media parameter of conversing of described permissible call.
In one embodiment, described session setup request message is initial INVITE message, and shown in step S201 among Fig. 2, described media parameter for describing conversation is the SDP parameter.
In one embodiment, describedly be designated Session-ID (conversation identifier) for end-to-end unique identification conversation.
Then, the first dispensing device 402 can send to backup sip server P ' INVITE of above-mentioned generation, shown in step S202 among Fig. 2.Cause network congestion excessive with backup sip server P ' load for fear of sending simultaneously a large amount of INVITE, the first dispensing device 402 can select random delay to send above-mentioned INVITE.
Fig. 5 shows the structured flowchart according to the device that is used for the maintenance conversation in voice gateways VGW-2 of a specific embodiment of the present invention.In Fig. 5, this device 500 comprises receiving system 501, judgment means 502 and the second dispensing device 503.
Below in conjunction with Fig. 2, elaborate to installing 500 the course of work.
Shown in step S203 among Fig. 2, receiving system 501 receives the new session setup request message from backup sip server P '.In one embodiment, described session setup request message is initial INVITE message.
Then, in step S204, the value that judgment means 502 can be judged the sign that is used for end-to-end unique identification conversation in this message whether value that is used for the sign that end-to-end unique identification converses with certain current permissible call is identical.In one embodiment, the described Session-ID that is designated for end-to-end unique identification conversation.The value that judgment means 502 can be judged Session-ID in this INVITE whether value with the Session-ID of current certain permissible call is identical.
If the judged result of judgment means is identical, subsequently in step S205, the second dispensing device 503 can send the conversation request of setting up to backup sip server P ' and reply message, replys in the message at this, has comprised the above-mentioned sign that is used for end-to-end unique identification conversation.In one embodiment, described session setup request message is INVITE, and it is 200OK message that message is replied in the described conversation request of setting up.In one embodiment, the described Session-ID that is designated for end-to-end unique identification conversation.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned exemplary embodiment, and in the situation that does not deviate from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard execution mode as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, therefore is intended to include in the present invention dropping on the implication that is equal to important document of claim and all changes in the scope.In addition, obviously other unit or step do not got rid of in " comprising " word, and odd number is not got rid of plural number.The first, the second word such as grade is used for representing title, and does not represent any specific order.
Claims (12)
1. method that be used for to keep conversation in voice gateways when voice gateways detect coupled server and break down, said method comprising the steps of:
A. for each permissible call, generate a new session setup request message, the value of sign that is used for end-to-end unique identification conversation in the described message is identical with the value of the sign that is used for end-to-end unique identification conversation of described permissible call, and the value that is used for the media parameter that description converses of value and described permissible call of media parameter that is used for describing conversation in the described message is identical;
B. send described session setup request message to backup server.
2. method according to claim 1 is characterized in that, described session setup request message is initial INVITE message, and described media parameter for describing conversation is the SDP parameter.
3. method according to claim 1 and 2 is characterized in that, the described Session-ID that is designated for end-to-end unique identification conversation.
4. one kind is used for the method that maintenance is conversed in voice gateways, said method comprising the steps of:
C. receive the new session setup request message from server;
D. the value of judging in the described message sign that the is used for end-to-end unique identification conversation whether value with the sign that is used for end-to-end unique identification conversation of certain current permissible call is identical;
If e. sentence read result is identical, send the conversation request of setting up to described server and reply message, wherein comprised described sign for end-to-end unique identification conversation.
5. method according to claim 4 is characterized in that, described session setup request message is initial INVITE message, and it is 200OK message that message is replied in the described conversation request of setting up.
6. according to claim 4 or 5 described methods, it is characterized in that the described Session-ID that is designated for end-to-end unique identification conversation.
7. one kind is used for the device that maintenance is conversed in voice gateways, and described device comprises:
Message creating apparatus, be used for when voice gateways detect coupled server and break down, generate a new session setup request message for each permissible call, the value of sign that is used for end-to-end unique identification conversation in the described message is identical with the value of the sign that is used for end-to-end unique identification conversation of described permissible call, and the value that is used for the media parameter that description converses of value and described permissible call of media parameter that is used for describing conversation in the described message is identical;
The first dispensing device is used for sending described session setup request message to backup server.
8. device according to claim 7 is characterized in that, described session setup request message is initial INVITE message, and described media parameter for describing conversation is the SDP parameter.
9. according to claim 7 or 8 described devices, it is characterized in that the described Session-ID that is designated for end-to-end unique identification conversation.
10. one kind is used for the device that maintenance is conversed in voice gateways, and described device comprises:
Receiving system is used for receiving the new session setup request message from server;
Judgment means is used for judging described message being used for the value of sign of end-to-end unique identification conversation the value with the sign that is used for end-to-end unique identification conversation of certain current permissible call being identical;
The second dispensing device is used for replying message when the sentence read result of judgment means sends the conversation request of setting up to described server when being identical, has wherein comprised the described sign of conversing for end-to-end unique identification.
11. device according to claim 10 is characterized in that, described session setup request message is initial INVITE message, and it is 200OK message that message is replied in the described conversation request of setting up.
12. according to claim 10 or 12 described devices, it is characterized in that the described Session-ID that is designated for end-to-end unique identification conversation.
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| CN108337103A (en) * | 2017-01-20 | 2018-07-27 | 普天信息技术有限公司 | Backup method, the standby recovery method and system of sip server |
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