CN101277345B - Method and apparatus for switching call - Google Patents
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- CN101277345B CN101277345B CN2008101066443A CN200810106644A CN101277345B CN 101277345 B CN101277345 B CN 101277345B CN 2008101066443 A CN2008101066443 A CN 2008101066443A CN 200810106644 A CN200810106644 A CN 200810106644A CN 101277345 B CN101277345 B CN 101277345B
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Abstract
An embodiment of the invention provides a method and device for switching call, the method and device belongs to communication field. The method comprises: receiving switching request sent by intermediate subscriber, the intermediate subscriber refers to SIP intermediate subscriber; by judging whether current call is a second call between the SIP intermediate subscriber and the launching subscriber according to the switching request, sending message containing information for substituting the intermediate subscriber to the terminal subscriber, in order to indicate the launching subscriber to negotiate with the terminal subscriber; and connecting call between the launching subscriber and the terminal subscriber for successful negotiation between the launching subscriber and the terminal subscriber. The embodiment of the invention also provides a device for switching call; the method and device has advantage for complying with subscriber requirement.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of method and device of tandem working.
Background technology
Conversation initialized protocol (Session Initiation Protocol, SIP) being one is used for setting up, the application layer protocol of change and termination Multimedia session or calling, be the Internet engineering duty group (InternetEngineering Task Force, IETF) one of multimedia communications system framework agreement of Zhi Dinging.Session Initiation Protocol can be used for initiation session, also can be used to invite the member to add the session of otherwise having set up.Along with development of science and technology, the scope that Session Initiation Protocol is used is more and more wider, and for the tandem working telephone service of supporting to provide in the traditional telephone system, IETF expands Session Initiation Protocol.The method of the tandem working based on Session Initiation Protocol of the prior art is to Internet protocol SPC PBX (InternetProtocol-private branch exchange by intermediate user, IP-PBX) transmission switching (Refer) message is initiated the flow process of tandem working, and the definition of Refer message sees RFC3515 The SessionInitiation Protocol (SIP) Refer Method for details.
Intermediate user and terminal use are only arranged in the prior art, and tandem working is to the method for initiating the user when conversation, and for the convenience of narrating, will initiate user definition is that SIP A, intermediate user are defined as SIP B, the terminal use is defined as SIP C; Initiating the user in actual conditions also can be public switch telephone network (PublicSwitched Telephone Network, PSTN) user, concrete method as shown in Figure 1, wherein B2BUA (back-to-back user agent) exists with a SIP access module in IP-PBX, and this method comprises the steps:
Step 11, SIP A send conversation by B2BUA to SIP B and invite;
Step 12, SIP A and SIP B hold consultation and connect conversation after the success;
Step 13, SIP A propose to need to connect SIP C to SIP B;
After step 14, SIP B SIP A are set to wait state, send call request to SIP C by B2BUA;
Step 15, SIP B and SIP C hold consultation and connect conversation after the success;
Step 16, SIP B send Refer message to B2BUA, and B2BUA is given SIP with the Refer forwards
C；
Step 17, SIP C initiate Invite (Replace:B) to B2BUA, and B2BUA is transmitted this message and given SIP A;
Step 18, SIP A and SIP C hold consultation and connect conversation after the success.
Said method is the method for general tandem working based on Session Initiation Protocol, and in actual conditions, needs SIP B and the SIP A back of conversing for the second time to give SIP C in switching sometimes, in this case, needs with following step replacement step 16～18:
After steps A, SIP B SIP C are set to wait state, by B2BUA and SIP A conversation;
After step B, SIP B and SIP A conversed for the second time, SIP B sent Refer message to B2BUA;
Step C, B2BUA are transmitted the tandem working of Refer message to SIP C;
Step D, SIP C initiate Invite (Replace:B) to B2BUA, and B2BUA is transmitted this message and held consultation for SIPA, SIP A and SIP C to connect after the success and converse.
In realizing process of the present invention, the inventor finds method described in the prior art, and there are the following problems:
Need under the situation of conversation for the second time with the initiation user at intermediate user, intermediate user is after B2BUA sends Refer message, B2BUA is to initiating Invite (replace B) message tandem working that the user sends, in reality, initiate the user and differ that to establish a capital be sip terminal, it also might be the PSTN terminal, and when the initiation user was the PSTN terminal, it can not discern Invite (replace B) message, also can't carry out tandem working; Even initiating the user is sip terminal, after carrying out tandem working, the number of terminal use's caller identification also is the number of intermediate user, and this does not meet user's general user demand.
Summary of the invention
Embodiment of the present invention provides a kind of method and device of tandem working, and described method and apparatus can directly be transferred to the terminal use with conversation when intermediate user is conversed for the second time with the initiation user.
The specific embodiment of the present invention provides a kind of method of tandem working, and described method comprises:
Receive the transfer-request that intermediate user sends, described intermediate user is the SIP intermediate user, judging according to described transfer-request under the situation that current talking is SIP intermediate user and the conversation second time of initiating the user,
Send the message that has replacement SIP intermediate user information to the terminal use, the user is initiated in indication and the terminal use holds consultation; And initiating to connect the conversation of initiating user and terminal use after user and terminal use consult successfully;
Described is that the SIP intermediate user comprises with the situation of the conversation second time of initiating the user judge current talking according to described transfer-request: whether the session information of session information in the more described transfer-request and SIP intermediate user and initiation user's the conversation first time is identical, is intermediate user and the conversation second time of initiating the user as the identical current talking of then judging.
The specific embodiment of the invention also provides a kind of device of tandem working, and described device comprises:
Receiving element: be used to receive the diversion message that intermediate user sends, described intermediate user is the Session initiation protocol SIP intermediate user;
Judging unit: be used for judging according to described transfer-request whether current talking is SIP intermediate user and the conversation second time of initiating the user; Described judging unit comprises:
Extraction module: the session information that is used for extracting described transfer-request;
Comparison module: whether the session information that is used for more described transfer-request is identical with the session information of SIP intermediate user and initiation user's the conversation first time, and the identical current sessions of then judging is SIP intermediate user and the conversation second time of initiating the user;
Transmitting element: be used for described judgment unit judges to go out current talking be intermediate user with the situation of the conversation second time of initiating the user under, send to the terminal use and to have the message of replacing SIP intermediate user information, the user is initiated in indication and the terminal use holds consultation;
On-unit is used in the conversation of initiating to connect after user and terminal use consult successfully described initiation user and described terminal use.
By the above-mentioned technical scheme that provides as can be seen, the technical scheme of the embodiment of the invention is being judged under the situation that current talking is SIP intermediate user and the conversation second time of initiating the user, send the message that has replacement SIP intermediate user information to the terminal use, connect the conversation of initiating user and terminal use; No matter to initiate the user be PSTN terminal or sip terminal thereby reached, and all can directly conversation be transferred to the terminal use, and terminal use's caller identification number also is the number of initiating the user, meets user's general user demand.
Description of drawings
Fig. 1 is the flow chart of the method for the described tandem working of prior art.
Fig. 2 is the flow chart of the method for the described tandem working of the specific embodiment of the invention
Fig. 3 is the flow chart of method of the tandem working of the embodiment of the invention 1.
Fig. 4 is the actual flow chart of the described initiator of the specific embodiment of the invention for PSTN user's IP-PBX tandem working.
Fig. 5 is the flow chart of method of the tandem working of the embodiment of the invention 2.
Fig. 6 is the actual flow chart of the described initiator of the specific embodiment of the invention for the IP-PBX tandem working of sip user.
Fig. 7 is the structure chart of the device of the described tandem working of the specific embodiment of the invention.
Embodiment
Embodiment of the present invention provides a kind of method of tandem working; This method judges whether by the transfer-request of receiving the intermediate user transmission whether current sessions is in the conversation second time of initiating user and intermediate user, and knows that by this transfer-request intermediate user needs tandem working; When judging current talking is to initiate under user and the situation about conversing the second time of intermediate user, directly send and have the message of replacing intermediate user information to the terminal use, to connect the conversation of initiating user and terminal use, described intermediate user and terminal use all are based on the terminal of SIP.This method is owing to be to send to the terminal use to have the message of replacing intermediate user information, so no matter the initiation user is that PSTN terminal or sip terminal all can be conversed with the terminal use, and conversation back terminal use's caller identification is for initiating user's telephone number.Said method initiate the user can be when being PSTN user by the finishing of IP-PBX, when initiating the user, can finish by the B2BUA among the IP-PBX during sip user.
Be that example illustrates the preferred steps that realizes this method below with IP-PBX, this step as shown in Figure 2:
Step 21, initiating after the user carries out conversation first time with intermediate user the transfer-request of IP-PBX reception intermediate user transmission;
Transfer-request in this step is preferentially selected Refer message.
Step 22, IP-PBX judge according to transfer-request whether current talking is that initiation user and intermediate user carry out the conversation second time; Carry out following step under the situation that is judging, otherwise the flow process of normally transferring.
Realize this step concrete grammar can for, extract the conversation message of the Refer message that intermediate user sends, according to the call-id in this conversation message, from-tag, to-tag judge whether current talking is intermediate user and the conversation second time of initiating the user.The concrete operations of its judgement can for, IP-PBX extracts the conversation message in the Refer message, this conversation message comprises call-id, from-tag and to-tag, then with the call-id in this conversation message, from-tag, call-id in the conversation message that the intermediate user of to-tag and IP-PBX storage and initiation user converse for the first time, from-tag, to-tag compares, as the identical current talking of then judging is intermediate user and the conversation second time of initiating the user, is not intermediate user and the conversation second time of initiating the user otherwise judge current talking.The definition of above-mentioned conversation message and Refer message sees also agreement RFC3261,
Step 23, IP-PBX send to the terminal use and have the message of replacing intermediate user information;
Sending to the terminal use in this step has the invitation message that the message of replacing intermediate user information can preferentially select to have replacement intermediate user information.
The implementation method of this step can for:
Method A, when initiating the user when being PSTN user, IP-PBX directly sends to the terminal use and has the invitation message INVITE (Replace:B) that replaces intermediate user;
If it is sip user that method B initiates the user, IP-PBX sends to the initiation user after the Refer message conversion that receives is become to have the Refer message of replacing intermediate user, IP-PBX receives and initiates the invitation message INVITE (Replace:B) that the user sends, and IP-PBX is transmitted to the terminal use with this INVITE (Replace:B).
Step 24, IP-PBX are initiating to connect the conversation of initiating user and terminal use after user and terminal use are consulting successfully.
Connection conversation in back can may further comprise the steps consulting successfully for initiation user in the said method and terminal use: if initiate the user is PSTN user, carry out media negotiation by IP-PBX substituting PS TN initiation user and terminal use, after consulting successfully, begin to initiate the conversation between user and the terminal use; If initiating the user is sip user, IP-PBX is just simple as the B2BUA of initiating between user and the terminal use, initiates just to begin conversation after user and terminal use consult successfully.
For better describing the described method of embodiment of the present invention, existing 3 pairs of the specific embodiment of the present invention in conjunction with the accompanying drawings describe:
Embodiment 1: the method for a kind of tandem working that the specific embodiment of the present invention provides, the technology scene of present embodiment is, initiating the user is the PSTN user terminal, suppose that PSTN and IP-PBX are by primary rate interface (Primary Rate Access, PRA) signaling butt joint will be initiated user, intermediate user, terminal use for the convenience of narrating and be set at PSTN A, SIP B, SIP C respectively.Present embodiment comprises following operation:
Step 31, after SIP B and PSTNA finish conversation for the first time, IP-PBX receives the Refer message of SIP B;
Step 32, IP-PBX extract the session information in the Refer message;
Step 33, IP-PBX judge according to the session information that extracts whether current talking is the conversation second time of SIP B and PSTN A;
The concrete grammar of realizing this step is not just being given unnecessary details here in above-mentioned explanation, when judging under the situation that is, carry out step 34～and 36; Otherwise the flow process of normally transferring;
Step 34, IP-PBX send to SIP C and have the invitation message INVITE (Replace:B) that replaces intermediate user, have the media information of SIP A among this invitation message INVITE (Replace:B);
Owing to have the number information of PSTN A in the FROM header field of this invitation message INVITE (Replace:B), the caller ID that shows at SIP C is the telephone number of PSTNA.
After step 35, SIP C receive INVITE (Replace:B), send the response message of corresponding INVITE (Replace:B) to IP-PBX;
Step 36, IP-PBX are after receiving this response message, from response message, obtain coding/decoding information, and open time division multiplexing (Time Division Mulipex, TDM) and Internet protocol (Internet Protocol, IP) media stream transition is connected the conversation of initiating user and terminal use;
This coding/decoding information can transmit the data format G711a of the information of voice, G729 etc. for IP network.
Be the actual flow process that example illustrates the IP-PBX tandem working below with IP-PBX, this flow chart as shown in Figure 4, wherein initiating the user is PSTN A, intermediate user is SIP B, the terminal use is SIP C; The flow process of this tandem working comprises the steps;
Step 41, PSTN A and SIP B carry out the conversation first time (A, B talking 1);
After step 42, SIP B were arranged to PSTN A to wait for, SIP B and SIP C conversed;
After step 43, SIP B were arranged to SIP C to wait for, SIP B and PSTN A carried out the conversation second time (A, B talking 2);
Step 44, SIP B send the transfer-request (Refer (refer-to A)) that has switching PSTN A information to IP-PBX;
After step 45, IP-PBX receive the transfer-request of intermediate user transmission, close the relevant TDM that is released to PSTN A and SIP B application ←---→ (resource generally is meant digital signal processor (Digital Signal Processing to the IP tts resource, DSP)), for the relevant TDM of the new application of the conversation of PSTN A and SIP C ←---→ the IP tts resource, and with this tts resource relevant information (as the IP address, port numbers, the code/decode type of support) and the information of replacing SIP B be carried in and send to SIP C (Invite (Replace B)) among the invitation message INVITE;
After step 46, SIP C receive invitation message, send the response message (200) of this invitation message;
Step 47, IP-PBX obtain coding/decoding information from described response message, IP-PBX checks the coding/decoding information obtain, if support this encoding and decoding, then start TDM ←---→ the IP tts resource, both sides begin conversation.
Embodiment 2: the method for a kind of tandem working that the specific embodiment of the present invention provides, the technology scene of present embodiment is, the operating main body of present embodiment is the B2BUA among the IP-PBX, initiating the user is the sip user terminal, will initiate user, intermediate user, terminal use for the convenience of narrating and be set at SIP A, SIP B, SIP C respectively.Present embodiment comprises following operation as shown in Figure 5:
Step 51, after SIP B and SIP A finish conversation for the first time, B2BUA is received the Refer message Refer (refer-to:A) of SIP B;
Step 52, B2BUA extract the session information in the Refer message;
Step 53, B2BUA judge according to the session information that extracts whether current talking is the conversation second time of SIP B and SIP A;
When judging under the situation that is, carry out step 54～58; Otherwise the flow processing of normally transferring;
After step 54, B2BUA become Refer (refer-to:C) message with Refer (refer-to:A) message conversion that receives, Refer (refer-to:C) is sent to the initiation user;
Refer (refer-to:A) message conversion with receiving in this step becomes the concrete grammar of Refer (refer-to:C) message can be the session information (call-id that extracts original B2BUA and sip C, from-tag, to-tag), generate the refer-to header field of Refer message, by the session of B2BUA and SIP A, generate Refer (refer-to:C) message and send to SIP A.
After step 55, SIP A receive Refer (refer-to:C) message, send INVITE (Replace:B) message to B2BUA;
Step 56; B2BUA is transmitted to SIP C with the INVITE (Replace:B) that receives;
After step 57, SIP C receive INVITE (Replace:B), send the response message (INVITE200) of corresponding INVITE (Replace:B) to B2BUA;
Step 58, B2BUA are transmitted to SIP A with response message after receiving this response message, SIP A replys acknowledge message (ACK), and after B2BUA was transmitted to C with ACK, SIP A and SIP C entered talking state.
Be the actual flow process that example illustrates the IP-PBX tandem working below with IP-PBX, this flow chart as shown in Figure 6, wherein initiating the user is SIP A, intermediate user is SIP B, the terminal use is SIP C; The flow process of this tandem working comprises the steps;
Step 61, SIP A and SIP B carry out the conversation first time (A, B talking 1);
After step 62, SIP B were arranged to SIP A to wait for, SIP B and SIP C conversed;
After step 63, SIP B were arranged to SIP C to wait for, SIP B and SIP A carried out the conversation second time (A, B talking 2);
Step 64, SIP B send the transfer-request Refer (refer-to:A) that has switching SIP A information to IP-PBX;
After the Refer that step 65, IP-PBX receive (refer-to:A) back generates Refer (refer-to:C), send to SIP A;
After step 66, SIP A receive Refer (refer-to:C), send INVITE (Replace:B);
Step 67, B2BUA are transmitted the SIP signaling between SIP A and the SIP C, SIP A, and after SIP C consults successfully, SIP A and SIP C conversation.
Embodiments of the present invention also provide a kind of device of tandem working, as shown in Figure 7, this device comprises receiving element 71: be used for after the SIP intermediate user carries out the session first time with the initiation user, receive the diversion message that intermediate user sends, described intermediate user is the Session initiation protocol SIP intermediate user; Judging unit 72: be used for judging according to described transfer-request whether current talking is SIP intermediate user and the conversation second time of initiating the user; Transmitting element 73: be used for going out under the situation that current talking is intermediate user and the conversation second time of initiating the user, send the message that has replacement SIP intermediate user information to the terminal use in described judgment unit judges; On-unit 74 is used for consulting successfully the laggard words that work initiation user and terminal use, and described terminal use is the sip terminal user.
Above-mentioned judging unit 72 can comprise: extraction module 721: the session information that is used for extracting described transfer-request; Comparison module 722: whether whether the session information that is used for more described transfer-request identical with the session information of conversing SIP intermediate user and initiation user's the first time, and the identical current sessions of then judging is SIP intermediate user and the conversation second time of initiating the user.
Above-mentioned transmitting element 73 can comprise: judge module 731, and the user judges that initiating the user is PSTN user or sip user; Sending module 732 is used for that to initiate the user be under PSTN user's the situation when described judge module 731 is judged, directly send have replace intermediate user message to the terminal use; Modular converter 734 is used for that to initiate the user be under the situation of sip user when described judge module 731 is judged, with described transfer-request convert to have the transfer-request of replacing intermediate user after, send to the initiation user; Receiver module 735 is used to receive the message of replacing intermediate user that has of initiating user's transmission; Forwarding module 736 is used for giving the terminal use with the described forwards of replacing intermediate user that has.Said apparatus can be IP-PBX.
Above-mentioned on-unit 74 can comprise: PSTN connects module 741, is used for initiating the user under PSTN user's the situation, and direct and terminal use carries out media negotiation, after consulting successfully, connects the conversation of initiating user and terminal use; SIP connects module 742, is used for initiating the user under the situation of sip user, holds consultation with the terminal use by initiating the user, consults successfully after, connection initiation user and terminal use's conversation.
The described device of invention embodiment, when receiving element receives diversion message, judgment unit judges goes out under the situation that current talking is SIP intermediate user and the conversation second time of initiating the user, send the message that has replacement SIP intermediate user information to the terminal use by transmitting element, and initiating to connect the conversation of initiating user and terminal use by on-unit after user and terminal use consult success; No matter to initiate the user be PSTN terminal or sip terminal thereby reached, and all can directly conversation be transferred to the terminal use, and terminal use's caller identification number also is the number of initiating the user, meets user's general user demand.
In sum, the technical scheme that the specific embodiment of the invention provides has the advantage that meets the general user demand of user.
" reception " speech in the embodiment of the invention can be understood as and initiatively obtains from other modules also can be to receive the information that other modules are sent.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The scheme of the content record of claim also is the protection range of the embodiment of the invention.
One of ordinary skill in the art will appreciate that all or part of processing in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. the method for a tandem working is characterized in that, described method comprises:
Receive the transfer-request that intermediate user sends, described intermediate user is the SIP intermediate user, judging according to described transfer-request under the situation that current talking is SIP intermediate user and the conversation second time of initiating the user,
Send the message that has replacement SIP intermediate user information to the terminal use, the user is initiated in indication and the terminal use holds consultation; And initiating to connect the conversation of initiating user and terminal use after user and terminal use consult successfully;
Described is that the SIP intermediate user comprises with the situation of the conversation second time of initiating the user judge current talking according to described transfer-request: whether the session information of session information in the more described transfer-request and SIP intermediate user and initiation user's the conversation first time is identical, is intermediate user and the conversation second time of initiating the user as the identical current talking of then judging.
2. method according to claim 1 is characterized in that, connects the conversation of initiating user and terminal use after described initiation user and terminal use consult successfully and comprises:
When initiating the user is under PSTN user's the situation, and direct and terminal use carries out media negotiation, after consulting successfully, connects the conversation of initiating user and terminal use;
Initiating the user be under the situation of sip user, holds consultation with the terminal use by initiating the user, consult successfully after, connection initiation user and terminal use's conversation.
3. method according to claim 1 is characterized in that, the described transmission to the terminal use has the message of replacing SIP intermediate user information and comprise:
When initiating the user be under public switch telephone network PSTN user's the situation, directly transmission have replace intermediate user message to the terminal use;
When initiating the user is under the situation of sip user, with described transfer-request convert to have the transfer-request of replacing intermediate user after, send to and initiate the user, receive the message of replacing intermediate user that has of initiating user's transmission, and give the terminal use the described forwards of replacing intermediate user that has.
4. method according to claim 1 is characterized in that, the described transmission to the terminal use has the message of replacing intermediate user information and comprise,
The information of replacing intermediate user is carried in the invitation message sends.
5. the device of a tandem working is characterized in that, described device comprises:
Receiving element: be used to receive the diversion message that intermediate user sends, described intermediate user is the Session initiation protocol SIP intermediate user;
Judging unit: be used for judging according to described transfer-request whether current talking is SIP intermediate user and the conversation second time of initiating the user; Described judging unit comprises:
Extraction module: the session information that is used for extracting described transfer-request;
Comparison module: whether the session information that is used for more described transfer-request is identical with the session information of SIP intermediate user and initiation user's the conversation first time, and the identical current sessions of then judging is SIP intermediate user and the conversation second time of initiating the user;
Transmitting element: be used for described judgment unit judges to go out current talking be intermediate user with the situation of the conversation second time of initiating the user under, send to the terminal use and to have the message of replacing SIP intermediate user information, the user is initiated in indication and the terminal use holds consultation;
On-unit is used in the conversation of initiating to connect after user and terminal use consult successfully described initiation user and described terminal use.
6. device according to claim 5 is characterized in that, described transmitting element comprises:
Judge module, the user judges that initiating the user is PSTN user or sip user;
Sending module is used for that to initiate the user be under PSTN user's the situation when described judge module is judged, directly send have replace intermediate user message to the terminal use;
Modular converter is used for that to initiate the user be under the situation of sip user when described judge module is judged, with described transfer-request convert to have the transfer-request of replacing intermediate user after, send to the initiation user;
Receiver module is used to receive the message of replacing intermediate user that has of initiating user's transmission;
Forwarding module is used for giving the terminal use with the described forwards of replacing intermediate user that has.
7. device according to claim 5 is characterized in that, described on-unit comprises:
PSTN connects module, is used for initiating the user under PSTN user's the situation, and direct and terminal use carries out media negotiation, after consulting successfully, connects the conversation of initiating user and terminal use;
SIP connects module, is used for initiating the user under the situation of sip user, holds consultation with the terminal use by initiating the user, consults successfully after, connection initiation user and terminal use's conversation.
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| CN101997997A (en) * | 2010-11-19 | 2011-03-30 | 太仓市同维电子有限公司 | System for realizing Internet telephony call transfer by utilizing SIP protocol and method thereof |
| CN102905003B (en) * | 2012-11-06 | 2018-08-03 | 周万荣 | A kind of caller identification of call forwarding and the method and system and terminal for calling clawback |
| CN104683314B (en) * | 2013-12-03 | 2019-03-01 | 中兴通讯股份有限公司 | User bridges call handling method, device and media server |
| CN110996358B (en) * | 2019-12-09 | 2022-05-24 | 迈普通信技术股份有限公司 | Call terminal switching method and device, electronic equipment and storage medium |
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| CN101087241A (en) * | 2006-06-06 | 2007-12-12 | 华为技术有限公司 | An implementation method of third-party control service |
| CN101132349A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Method for extended implementing IMS connected number indication business by SIP signaling |
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| CN101087241A (en) * | 2006-06-06 | 2007-12-12 | 华为技术有限公司 | An implementation method of third-party control service |
| CN101132349A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Method for extended implementing IMS connected number indication business by SIP signaling |
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