CN101198089B - Method and system for implementing call forwarding service, and voice call continuous server - Google Patents
Method and system for implementing call forwarding service, and voice call continuous server Download PDFInfo
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Abstract
The invention provides a method of fulfilling the call forwarding service, initially, a first user terminal and a second user terminal establish a session, the call forwarding of the second user terminal includes that: the second user terminal transmits a call forwarding service request to a VCCAS; the VCCAS generates a call forwarding message containing the first user terminal and an address of a third user terminal according to the received call forwarding service request, and the message is transmitted to the first user terminal after an application server shielding the address; the first user terminal establishes a session with the third user terminal through the application server according to the received call forwarding message. The invention also provides a system and the VCCAS of fulfilling the call forwarding service. The route can be simplified while the call forwarding service is fulfilled by adopting the invention, thereby reducing the delay and improving the quality of a link.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method, system and voice call continuous server of realizing call transfer service.
Background technology
Calling transfer is a business in the mobile communication, and user terminal can be realized talking connection to the third party by using calling transfer.Concrete, in first user terminal and the second user terminal communication process, second user terminal is realized the conversation between first user terminal and the 3rd user terminal with this call transfer to the three user terminals, second user terminal withdraws from this conversation.
In the calling transfer process, routing condition can change accordingly.For example, a kind of routing condition of calling transfer as shown in Figure 1.At first set up conversation between first user terminal and second user terminal, set up route between MSC2 under first user terminal and the MSC1 under second user terminal, be divided into carrying 101 and signaling 102.Carrying is meant professional transmission such as user terminal speech, and signaling refers to the control information of user terminal and network side and the exchange of state information.In a certain moment, second user terminal sends call transfer request to affiliated MSC1, then sets up route between the MSC3 of MSC1 that this moment, second user terminal belonged to and the 3rd user terminal ownership, is divided into carrying 103 and signaling 104.After calling transfer is finished, first user terminal begins to converse with the 3rd user terminal, route between first user terminal and the 3rd user terminal comprises part between MSC2 and the MSC1 and the part between MSC1 and the MSC3, i.e. carrying between first user terminal and the 3rd user terminal comprises 101 and 103 two parts, and the signaling between first user terminal and the 3rd user terminal comprises 102 and 104 two parts.
Continuous development along with the communication technology, 3G, WLAN (wireless local area network) (Wireless Fidelity have appearred, WiFi), World Interoperability for Microwave Access, WiMax (Worldwide Interoperability for MicrowaveAccess, the access way that speed is faster, bandwidth is higher such as Wimax).In order to solve the problem that plurality of access modes merges mutually, third generation partner program (the 3rd Generation Partnership Project, (IP Multimedia Subsystem IMS) is the network configuration of framework 3GPP) to have released the employing IP multimedia subsystem, IMS in the R6 version.In this network configuration, no matter be which kind of access way can be linked into by the interface that IMS provides in the consolidated network, this just mean user terminal can be under different access waies conversation mutually, and can in different access waies, freely switch.(Voice Call Continuity, VCC) technology keep conversation continuously to solve under the situation that user terminal switches in different access waies to have introduced continuous voice call among the IMS.For example user terminal can switch to 3G from traditional 2G (as GSM) in the IMS network, by the VCC technology conversation is kept continuously in this process.
A kind of IMS calling network of the prior art shifts routing condition as shown in Figure 2.Media gateway among the figure (Media Gateway, MGW) mainly finish encoding and decoding conversion work, media gateway controlling unit (MGW Control Function, MGCF) mainly the carrying of MGW is controlled, VCC application server (VCC Application Server, VCCAS) mainly finish the realization of user terminal VCC function, Session Control Unit (Call Session Control Function, CSCF) be application server (Application Server, AS-B) a kind of mainly realizes calling network control.Wherein, MGCF, VCCAS and CSCF belong to the IMS network.Routing condition in this calling transfer process is: first user terminal is by MGW and the conversation of second user terminal, wherein second user terminal is by the CS network insertion, setting up route between first user terminal and second user terminal is connected, be divided into carrying 201 and signaling 202, wherein, carrying 201 connects described MSC2 of first user terminal and the described MSC1 of second user terminal through MGW, and signaling 202 is connected MSC2 and MSC1 through CSCF, VCCAS with MGCF (promptly by the IMS network).Second user terminal transfers the call to the 3rd user terminal, set up route between second user terminal and the 3rd user terminal, be divided into carrying 203 and signaling 204, wherein, carrying 203 connects described MSC1 of second user terminal and the described MSC3 of the 3rd user terminal through MGW, and signaling 204 is connected MSC1 and MSC3 through CSCF, VCCAS with MGCF (promptly by the IMS network).After calling transfer was finished, first user terminal and the 3rd user terminal were conversed, and second user terminal withdraws from conversation, and final route is, the carrying between first user terminal and the 3rd user terminal comprises 201 and 203, and signaling comprises 202 and 204.
As seen, though second user terminal has withdrawed from conversation under this situation, route between first user terminal and the 3rd user terminal still will be through the MSC1 under second user terminal, CSCF, VCCAS and MGCF, it is circuitous to have produced unnecessary route like this, make the network element of route process too much and complicated, and the routing procedure complexity can be brought bigger delay, thereby causes the conversation of user terminal to bring delay, and link-quality reduces; And because carrying and signaling all are the precious resources of system, this situation can cause resource waste.
Summary of the invention
The purpose of this invention is to provide a kind of method, system and voice call continuous server of realizing call transfer service, overcome the circuitous shortcoming of route in the time of with the realization call transfer service.
For solving the problems of the technologies described above, the invention provides a kind of method, system and voice call continuous server of call transfer service realized and be achieved in that
A kind of method that realizes call transfer service, first user terminal and second user terminal are set up session when initial, and second user terminal carries out calling transfer and comprises:
A. second user terminal sends the call transfer service request to voice call continuous server;
B. voice call continuous server is according to the call transfer service request of receiving, generation comprises the calling transfer message of described first user terminal and the 3rd user terminal address, and this message is sent to described first user terminal behind the application server shielded address;
C. first user terminal is according to the session of the calling transfer message of receiving by application server foundation and described the 3rd user terminal.
Further comprise before the described steps A:
Second user terminal is by the session between the circuit-domain network hang-up and first user terminal.
When carry out be inquiry type calling transfer the time, described second user terminal hang up and the session step of first user terminal and described steps A between further comprise:
After setting up the session between second user terminal and the 3rd user terminal and carry out one section conversation by voice call continuous server, hang up the session between second user terminal and the 3rd user terminal.
Session between described hang-up second user terminal and the 3rd user terminal is realized by following mode:
Voice call continuous server by the mode that sends updating message or heavily invite message to the 3rd user terminal notify the 3rd user terminal hang up and second user terminal between session.
Calling transfer message sent to first user terminal realize behind the application server shielded address among the described step B by following mode:
Calling transfer message is sent to application server, application server is preserved the 3rd user terminal address in the calling transfer message of receiving, generate the calling transfer session identification, and after covering the 3rd user terminal address in the described calling transfer message with this calling transfer session identification, send the message to first user terminal;
The foundation of first user terminal is realized by following mode with the session of the 3rd user terminal among the described step C:
First user terminal initiates to set up conversation request to application server according to the calling transfer message received, and application server sends to the 3rd user terminal with this request after covering calling transfer session identification in this request with the 3rd user terminal address of preservation;
The 3rd user terminal is according to the conversation request of receiving of setting up, by the session of application server foundation with first user terminal.
Voice call continuous server is realized by following mode according to the call transfer service request generation calling transfer message of receiving among the described step B:
Voice call continuous server is according to receiving the call transfer service request, generation comprises the calling transfer message of the message header of the dialogue between sign voice call continuous server and the 3rd user terminal, and described dialogue belongs to the session between second user terminal and the 3rd user terminal.
Described step C also comprises:
According to setting up the sign voice call continuous server that comprises in the conversation request and the message header of the dialogue between the 3rd user terminal, discharge the dialogue in the session between the 3rd user terminal and second user terminal.
Described step C also comprises:
Discharge the relevant bearer in the session between the 3rd user terminal and second user terminal.
Described step C also comprises:
Dialogue between the voice call continuous server release and first user terminal, and the dialogue between the release and second user terminal, described two dialogues belong to the session between first user terminal and second user terminal.
A kind of system that realizes call transfer service comprises first user terminal that carries out calling transfer, second user terminal, and the 3rd user terminal, the mobile switching centre of second user terminal ownership, voice call continuous server, application server, wherein,
Voice call continuous server is used to continue second user terminal respectively and the session between first user terminal and the 3rd user terminal;
Signaling when described mobile switching centre is used to handle second user terminal and first user terminal and carries out session with the 3rd user terminal and the exchange of carrying;
When second user terminal and first user terminal are set up session and are carried out calling transfer:
Voice call continuous server also is used to receive the call transfer service request that second user terminal is sent, generate the calling transfer message that comprises first user terminal and the 3rd user terminal address according to this request, and this message is sent to first user terminal through application server according to described first user terminal address;
First user terminal is used for by the session between application server foundation and the 3rd user terminal;
Application server is used for shielding the address that voice call continuous server is dealt into the calling transfer message of first user terminal, and manages the session of setting up between first user terminal and the 3rd user terminal.
Described second user terminal has the transfer decision package, the type of this calling transfer that is used to make a strategic decision, and the type comprises inquiry type and blind transition.
Described voice call continuous server comprises:
Contiguous unit is used for by application server second user terminal that continues, and by application server continue first user terminal and the 3rd user terminal;
The Transfer Message generation unit is used for obtaining according to the call transfer service request that second user terminal that contiguous unit receives is sent the address of first user terminal and the 3rd user terminal, generates the calling transfer message that comprises this address.
The transfer agent unit, the calling transfer message that is used for generating sends to first user terminal via application server.
Described voice call continuous server further comprises:
Hang up the unit, be used for hanging up by the session between the contiguous unit and second user terminal, and hang up by the session between contiguous unit and the 3rd user terminal in inquiry type calling transfer.
Described voice call continuous server further comprises:
Releasing unit is used to discharge the dialogue between the contiguous unit and first user terminal, and discharges the dialogue between the contiguous unit and second user terminal.
A kind of voice call continuous server of realizing call transfer service comprises contiguous unit, Transfer Message generation unit and transfer agent unit, wherein,
Contiguous unit is used for by application server second user terminal that continues, and by application server continue first user terminal and the 3rd user terminal;
The Transfer Message generation unit is used for obtaining according to the call transfer service request that second user terminal that contiguous unit receives is sent the address of first user terminal and the 3rd user terminal, generates the calling transfer message that comprises this address.
The transfer agent unit, the calling transfer message that is used for generating sends to first user terminal via application server.
Described voice call continuous server further comprises:
Hang up the unit, be used for hanging up by the session between the contiguous unit and second user terminal, and hang up by the session between contiguous unit and the 3rd user terminal in inquiry type calling transfer.
Described voice call continuous server further comprises:
Releasing unit is used to discharge the dialogue between the contiguous unit and first user terminal, and discharges the dialogue between the contiguous unit and second user terminal.
By above technical scheme provided by the invention as seen, the present invention sends to VCCAS with the call transfer service request of second user terminal, VCCAS replaces second user terminal to generate and send calling transfer message, via AS-B to first user terminal, first user terminal is by the session between AS-B foundation and the 3rd user terminal, discharge the relevant session of second user terminal afterwards, like this, when realizing call transfer service, the carrying of session directly is connected between first user terminal and the 3rd user terminal, and signaling is through the AS-B connection, thereby simplified route, reduce delay, improved link-quality, also improved resource utilization ratio.
Description of drawings
Fig. 1 is the routing diagram of calling transfer under the existing CS network;
Fig. 2 is the routing diagram of calling transfer under the IMS network;
Fig. 3 realizes the flow chart of an embodiment of call transfer service method for the present invention;
Fig. 4 is for implementing route results figure of the present invention;
Fig. 5 is the signaling procedure figure of inquiry type calling transfer of the present invention;
Fig. 6 is the signaling procedure figure of the present invention's blind transition of calling transfer;
Fig. 7 realizes the block diagram of an embodiment of call transfer service system for the present invention.
Embodiment
Core of the present invention is that second user terminal sends to VCCAS with the call transfer service request, VCCAS replaces second user terminal to generate and send calling transfer message, through AS-B to first user terminal, first user terminal is according to the calling transfer message of receiving, by the session between AS-B foundation and the 3rd user terminal.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
Call transfer service is divided into two types of inquiry type and blind transition.Second user terminal can be as required, the type that selective call is shifted.The inquiry type is after second user terminal sends the calling transfer order, can carry out one section conversation with the 3rd user terminal earlier, and first user terminal and the 3rd user terminal are conversed then, and second user terminal withdraws from.Be after second user terminal sends the calling transfer order blind transition, do not converse with the 3rd user terminal, and directly conversed with the 3rd user terminal by first user terminal, and second user terminal withdraws from.
When initial, set up session to converse between first user terminal and second user terminal.Between first user terminal and second user terminal by the carrying media stream in the session.In the process that between second user terminal and first user terminal, connects, VCCAS and AS-B add signaling link, and then the signaling between first user terminal and second user terminal comprises that first user terminal is by dialogue Dialog11 between AS-B and VCCAS and the dialogue Dialog12 between VCCAS and MGCF.Wherein, Dialog is a kind of signaling relation, route between the communicating pair is provided and carry out prioritisation of messages will foundation state information.The process of session comprises the Media Stream by the carrying transmission between the user, and comprises signalling interactive process.AS-B comprises P-CSCF, I-CSCF, S-CSCF or other AS.In a certain moment, second user terminal will carry out inquiry type or the busy calling transfer that makes the transition according to the selection of second user terminal afterwards with call transfer to the three user terminals of first user terminal.
Below introduce and call out an embodiment of the second user terminal method.Fig. 3 shows the flow process of this embodiment.
Step 301: second user terminal sends the call transfer service request to VCCAS.
Second user terminal sends the call transfer service request to VCCAS to VCCAS, can be to send by the Notify message in the SIP signaling.
When second user terminal carry out be inquiry type calling transfer the time, in this step, also need second user terminal set up and the 3rd user terminal between session to carry out one section conversation.In this process, AS-B and VCCAS add the signaling link between second user terminal and the 3rd user terminal, are specifically as follows VCCAS by Dialog21 between AS-B and the 3rd user terminal and the Dialog22 between VCCAS and the MGCF.What carry out when second user terminal is blind transition of calling transfer, need not set up in this step and the 3rd user terminal between session, promptly do not need the conversation of elder generation and the 3rd user terminal.
In this step, further, second user terminal can by the CS network hang up and first user terminal between session, promptly suspend the Media Stream between second user terminal and first user terminal and keep its carrying.Like this, if this calling transfer failure, the Media Stream before can recovering between second user terminal and first user terminal.
There are a kind of two user terminals to set up the method for session by AS-B in the prior art, fail safe in order to guarantee to converse between two users in this method, dialogue between the user need be passed through AS-B, and AS-B handles this dialogue, as the station address information of carrying in this dialogue is handled.In the method for present embodiment, can adopt this method.Then, in the described method of present embodiment, owing to comprise the address of first user terminal and the 3rd user terminal in the call transfer service request, therefore VCCAS can obtain the address of first user terminal and the 3rd user terminal from the call transfer service request that second user terminal is sent, and arrives AS-B thereby send the message that comprises this first user terminal address or the 3rd user terminal address in follow-up step.
Step 302:VCCAS generates calling transfer message according to the call transfer service request, and send this message via AS-B to first user terminal.
In this step, VCCAS is according to the call transfer service request of receiving, generation comprises the calling transfer message of the 3rd user terminal address and first user terminal address and this message is sent to AS-B, and AS-B preserves the address of the 3rd user terminal in the calling transfer message.As previously mentioned, VCCAS can obtain the address of first user terminal and the address of the 3rd user terminal in this step from the call transfer service request of receiving.Afterwards, VCCAS sends to first user terminal with described calling transfer message via AS-B.
Concrete, the calling transfer message of generation can be REFER message, comprises RequestURI, Referred to, Referred by, these fields of Replaces.Wherein, Refer to head is filled to the address of the 3rd user terminal, is the 3rd user terminal with the destination address that shows this time calling transfer.
After AS-B receives calling transfer message, the address of the 3rd user terminal in this message is preserved, and generation calling transfer session identification (Uniform Resouce Identity, URI), this URI is covered the message header of calling transfer message, promptly cover the address of the 3rd user terminal, afterwards this message is sent to first user terminal, and this message header belongs to privately owned URI (Private URI), realized like this shielding address between the 3rd user terminal, ensured the safety of network to first user terminal.Simultaneously, AS-B may reside in the follow-up link, thereby can realize chargeing.
When second user terminal carry out be inquiry type calling transfer the time, there is Dialog21 between VCCAS and the 3rd user terminal, there is Dialog22 between the VCCAS and second user terminal, then in this step, can also comprise the information that identifies Dialog21 in the calling transfer message that generates, Dialog21 be can be made as the Replaces message header in the REFER message, Dialog21 and Dialog22 discharged to be implemented in to notify when call transfer service is finished in the subsequent step.In sum, as adopting REFER message, a then wherein each field can for:
Request?URI：UE-A
Referred?to：UE-C
Referred?by：UE-B
Replaces：Dialog21
Before this step, further, can hang up the session between second user terminal and the 3rd user terminal, promptly suspend the Media Stream between second user terminal and the 3rd user terminal and keep its carrying, like this, if this calling transfer failure, the Media Stream before can recovering between second user terminal and the 3rd user terminal.Concrete, can be that VCCAS replaces renewal (Update) message in second user terminal transmission Session Initiation Protocol or heavily invites (Re-INVITE) message to the three user terminals, to notify the session between the hang-up of the 3rd user terminal and second user terminal.
Step 303: after the calling transfer message that first user terminal is received, transmission is set up conversation request and is arrived the 3rd user terminal through AS-B, to set up the session between first user terminal and the 3rd user terminal.
In this process, first user terminal sends and sets up conversation request to the three user terminals, and this is set up conversation request and at first sends to AS-B.This sets up conversation request can be INVITE, and then according to the calling transfer message of receiving, the URI in this INVITE is aforesaid calling transfer session identification URI, is Private URI, and the Replaces message header is Dialog21.After AS-B receives this message, utilize the 3rd user terminal address of storage, behind the address covering URI with the 3rd user terminal this message is sent to the 3rd user terminal.The message that the 3rd user terminal response is received is set up session conversing with first user terminal, thereby is realized calling transfer.Like this, first user terminal is first user terminal being connected between AS-B to the three user terminals with dialogue between the 3rd user terminal, no longer through equipment such as VCCAS, the MGCF of second user terminal ownership, MSC, and MSC, the MGW of the carrying between first user terminal and the 3rd user terminal by belonging to separately, the connection of equipment such as VCCAS has so just realized the simplification of route.
This method can also comprise that step 304:VCCAS discharges respectively and first user terminal and and second user terminal between dialogue.
As previously mentioned, because first user terminal and second user terminal are set up session and are conversed before this method, have Dialog11 and Dialog12, in this process, Dialog11 between the VCCAS release and first user terminal, the Dialog12 between release and the MGCF.And then the session between second user terminal and first user terminal discharges thereupon, is specially MGCF and disconnects first user terminal through the carrying between the MGW and second user terminal thereupon, has promptly discharged the MSC of second user terminal ownership.
When second user terminal carry out be inquiry type calling transfer the time, there is Dialog21 between VCCAS and the 3rd user terminal, there is Dialog22 between the VCCAS and second user terminal, then in this step, the Dialog21 of Replaces message header in the INVITE that the 3rd user terminal is received according to abovementioned steps, discharge and VCCAS between Dialog21, and discharge Dialog22 between VCCAS and the MGCF, thereby discharge the dialogue between second user terminal and the 3rd user terminal.And then MGCF disconnects the 3rd user terminal by the session between the MGW and second user terminal thereupon, promptly discharges the carrying between the 3rd user terminal and second user terminal.
After carrying out above-mentioned steps 301 to 304, routing condition as shown in Figure 4.As seen, route results is, to be signaling 401 between first user terminal and the AS-B and signaling 402, the first user terminals between the 3rd user terminal and the AS-B directly link to each other with carrying between the 3rd user terminal in dialogue between first user terminal and the 3rd user terminal, for carrying 403.This result has simplified route, has reduced the delay between first user terminal and the 3rd user terminal, has improved link-quality and has improved resource utilization ratio.
Below introduce the process of inquiry type calling transfer in detail.
Fig. 5 shows the entire flow of an embodiment of inquiry type calling transfer.
Step 501: set up session between second user terminal and first user terminal and converse, AS-B and VCCAS add signaling link.First user terminal is Dialog11 by the signaling link between AS-B and VCCAS, and the signaling link between VCCAS and MGCF is Dialog12.
This step is that calling transfer begins preceding second user terminal and first user terminal is set up the normal calling procedure of conversation.
Step 502: second user terminal is by the session between the hang-up of CS network and first user terminal.
In this step, second user terminal hang up by the CS network and first user terminal between session, promptly suspend the Media Stream between second user terminal and first user terminal and keep its carrying.
This step is that second user terminal is carried out in the calling transfer process, setting up before session converses with the 3rd user terminal, hangs up the session between second user terminal and first user terminal.As previously mentioned, this step is owing to having hung up session, if this calling transfer is failed the Media Stream before can recovering between second user terminal and first user terminal.
Step 503: set up session between second user terminal and the 3rd user terminal, AS-B and VCCAS add signaling link.
The 3rd user terminal by AS-B and VCCAS and between signaling link be Dialog21, the signaling link between VCCAS and MGCF is Dialog22.
Step 504: second user terminal makes a call the transfer service request to VCCAS.
This step is that second user terminal is by session initiation protocol (Session Initial Protocol, SIP) message, unstructured supplementary data traffic (Unstructured Supplementary Services Date, USSD) message or Short Message Service (Short Messenger Service, SMS) etc. mode sends, and can be NOTIFY among the SIP as this message.
VCCAS receives echo reply message 200OK after this message.
Step 505: hang up the session between second user terminal and the 3rd user terminal.
In this step, can be to replace second user terminal to send UPDATE message or Re-INVITE message to the three user terminals by VCCAS, with notify between the 3rd user terminal hang up and second user terminal between session, promptly suspend the Media Stream between second user terminal and the 3rd user terminal and keep its carrying.
As previously mentioned, this step if this calling transfer is failed, can be recovered the Media Stream between second user terminal and the 3rd user terminal owing to hung up session.
Step 506:VCCAS replaces second user terminal to send REFER message to AS-B.
This message is calling transfer message, and the message header Refer-to in this message is filled to the address of the 3rd user terminal.Calling transfer is carried out in this message indication, and the address of the 3rd user terminal is the address of the 3rd user terminal.And the Replaces message header in this message is Dialog21.
Step 507:AS-B receives REFER message, the address of wherein the 3rd user terminal is preserved, and generate calling transfer session identification URI, and this URI is write among the message header Refer-to, sends to first user terminal.
This URI is privately owned (Private) URI.Like this, first user terminal can not known the address of the 3rd user terminal, plays guaranteeing role for network security.In addition, AS-B may reside in the follow-up link, is convenient to charge.Replaces message header in this message is Dialog21.
Step 508: the first user terminal echo reply message 202Accepted.
This message arrives VCCAS via AS-B.
Step 509: first user terminal sends sets up conversation request to AS-B.This step is first user terminal initiates to set up the first step from conversation request to the 3rd user terminal.This message can be INVITE, and the URI that comprises in this message is the calling transfer session identification URI of abovementioned steps, is Private URI.The Replaces message header of this message is Dialog21, will discharge dialogue between the 3rd user terminal and second user terminal to notify the 3rd SS later step.
Step 510:AS-B will set up the address that URI in the conversation request changes to the 3rd user terminal, again this request be sent to the 3rd user terminal, with notify the 3rd user terminal set up and first user terminal between session.
Step 511: to first user terminal, can converse by indication via AS-B for the 3rd user terminal transmission 200OK message.
Step 512: first user terminal returns the ACK response message.
Like this, setting up session between first user terminal and the 3rd user terminal converses.
Step 513: first user terminal sends NOTIFY to VCCAS, and indicating call shifts successfully.VCCAS returns the 200OK response message.
Step 514:VCCAS sends BYE message to first user terminal, the Dialog11 between the dismounting and first user terminal.First user terminal returns the 200OK response message.
Step 515:VCCAS sends BYE message to user MGCF, the Dialog12 between dismounting and the MGCF.MGCF returns the 200OK response message.
After this step, the signaling between MGCF disconnection and the MSC discharges the carrying between second user terminal and first user terminal.
Step 516: the 3rd user terminal is according to the Replaces head in the INVITE of receiving in the step 509, and promptly the Dialog21 in this Replaces head sends BYE message to VCCAS, to discharge the link Dialog21 between VCCAS and the 3rd user terminal.VCCAS to MGCF, discharges Dialog22 with the BYE message forwarding.MGCF sends the 200OK response message to VCCAS, and is before forwarded to the 3rd user terminal.Afterwards, the MGCF disconnection is connected with second user terminal, discharges the carrying between second user terminal and the 3rd user terminal.
Below introduce the process of blind transition of calling transfer in detail.
Fig. 6 shows the entire flow of an embodiment of blind transition of calling transfer.
Step 601: set up session between second user terminal and first user terminal and converse, AS-B and VCCAS add signaling link.First user terminal is Dialog11 by the signaling link between AS-B and VCCAS, and the signaling link between VCCAS and MGCF is Dialog12.
This step is that calling transfer begins preceding second user terminal and first user terminal is set up the normal calling procedure of conversation.
Step 602: second user terminal is by the session between the hang-up of CS network and first user terminal.
In this step, second user terminal hang up by the CS network and first user terminal between session, promptly suspend the Media Stream between second user terminal and first user terminal and keep its carrying.
This step is that second user terminal is carried out in the calling transfer process, setting up before session converses with the 3rd user terminal, hangs up the session between second user terminal and first user terminal.As previously mentioned, this step is owing to having hung up session, if this calling transfer is failed the Media Stream before can recovering between second user terminal and first user terminal.
Step 603: second user terminal makes a call the transfer service request to VCCAS.
This step is that second user terminal is by session initiation protocol (Session Initial Protocol, SIP) message, unstructured supplementary data traffic (Unstructured Supplementary Services Date, USSD) message or Short Message Service (Short Messenger Service, SMS) etc. mode sends, and can be NOTIFY among the SIP as this message.
VCCAS receives echo reply message 200OK after this message.
Step 604:VCCAS replaces second user terminal to send REFER message to AS-B.
This message is calling transfer message, and the message header Refer-to in this message is filled to the address of the 3rd user terminal.Calling transfer is carried out in this message indication, and the address of the 3rd user terminal is the address of the 3rd user terminal.
Step 605:AS-B receives REFER message, the address of wherein the 3rd user terminal is preserved, and generate calling transfer session identification URI, and this URI is write among the message header Refer-to, sends to first user terminal.
This URI is Private URI.Like this, first user terminal can not known the address of the 3rd user terminal, plays guaranteeing role for network security.In addition, AS-B may reside in the follow-up link, is convenient to charge.
Step 606: the first user terminal echo reply message 202Accepted.
This message arrives VCCAS via AS-B.
Step 607: first user terminal sends sets up conversation request to AS-B.This step is first user terminal initiates to set up the first step from conversation request to the 3rd user terminal.This message can be INVITE, and the URI that comprises in this message is the calling transfer session identification URI of abovementioned steps, is Private URI.
Step 608:AS-B will set up the address that URI in the conversation request changes to the 3rd user terminal, again this request be sent to the 3rd user terminal, with notify the 3rd user terminal set up and first user terminal between session.
Step 609: to first user terminal, can converse by indication via AS-B for the 3rd user terminal transmission 200OK message.
Step 610: first user terminal returns the ACK response message.
Like this, setting up session between first user terminal and the 3rd user terminal converses.
Step 611: first user terminal sends NOTIFY to VCCAS, and indicating call shifts successfully.VCCAS returns the 200OK response message.
Step 612:VCCAS sends BYE message to first user terminal, the Dialog11 between the dismounting and first user terminal.First user terminal returns the 200OK response message.
Step 613:VCCAS sends BYE message to user MGCF, the Dialog12 between dismounting and the MGCF.MGCF returns the 200OK response message.
After this step, the signaling between MGCF disconnection and the MSC discharges the carrying between second user terminal and first user terminal.
It more than is the method that the present invention realizes call transfer service.The present invention also provides a kind of system that realizes call transfer service.Below introduce an embodiment of this system.
Fig. 7 shows the block diagram of this system embodiment.
As shown in the figure, this system comprises: first user terminal 71 that carries out calling transfer, second user terminal 72, the 3rd user terminal 73, the moving exchanging center MSC 74 of second user terminal ownership, media gateway MGW 75, media gateway controlling unit MGCF76, voice call continuous server VCCAS77, application server AS-B78.
Wherein,
MSC links to each other with MGCF with MGW respectively, the signaling when being used to handle second user terminal and first user terminal and carrying out session with the 3rd user terminal and the exchange of carrying.
MGW links to each other with MSC, MGCF, first user terminal and the 3rd user terminal respectively, the encoding and decoding conversion of carrying when being used to finish second user terminal by MSC and first user terminal with the 3rd user terminal session.
MGCF links to each other with MGW with MSC, VCCAS respectively, is used to provide the connection of described MSC to the signaling of VCCAS, and the carrying of control MGW.
VCCAS links to each other with AS-B with MGCF respectively, is used to the session relevant with second user terminal that continue, and receives the call transfer service request that second user terminal is sent, and generates calling transfer message and sends to first user terminal via AS-B.
Further, VCCAS also is used for the session between inquiry type calling transfer hang-up second user terminal and the 3rd user terminal.
Further, VCCAS also be used to discharge and first user terminal between dialogue, and discharge and second user terminal between dialogue.
First user terminal is used for by the session between AS-B foundation and the 3rd user terminal.
AS-B links to each other with VCCAS, first user terminal and the 3rd user terminal respectively, is used for shielding the address that VCCAS is dealt into the calling transfer message of first user terminal, and manages the session of setting up between first user terminal and the 3rd user terminal.
Concrete, described second user terminal has the decision package 721 of transfer, the type of this calling transfer that is used to make a strategic decision, and the type comprises inquiry type and blind transition.
Concrete, described VCCAS comprises contiguous unit 771, Transfer Message generation unit 772 and transfer agent unit 773, wherein,
Transfer Message generation unit 772 links to each other with contiguous unit 771, be used for obtaining the address of first user terminal and the 3rd user terminal, and generate the calling transfer message that comprises this address according to the call transfer service request that second user terminal that contiguous unit 771 receives is sent.
And described VCCAS further comprises session hang-up unit 774 and session releasing unit 775, wherein,
Session is hung up unit 774 and is linked to each other with contiguous unit 771, is used for hanging up by the session between the contiguous unit 771 and second user terminal in inquiry type calling transfer, and hangs up by the session between contiguous unit 771 and the 3rd user terminal.
Among the embodiment of native system, second user terminal and first user terminal are set up session when initial, and when second user terminal carried out calling transfer, second user terminal sent the call transfer service request to voice calls call continuity server VCCAS; VCCAS generates calling transfer message according to the call transfer service request of receiving, this message sends to first user terminal through application server AS-B; First user terminal is according to the calling transfer message of receiving, by the session of AS-B foundation with the 3rd user terminal; Discharge the session relevant with second user terminal.
The process of the embodiment specific implementation calling transfer of native system and the content class in the previous methods seemingly do not repeat them here.
By above embodiment as seen, method of the present invention, system and voice call continuous server can be realized call transfer service, and the carrying of session between first user terminal and the 3rd user terminal directly is connected, signaling connects through AS-B, thereby simplified route, and then improved resource utilization ratio, and reduced delay, improved link-quality.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (16)
1. method that realizes call transfer service, first user terminal and second user terminal are set up session when initial, it is characterized in that second user terminal carries out calling transfer and comprises:
A. second user terminal sends the call transfer service request to voice call continuous server;
B. voice call continuous server is according to the call transfer service request of receiving, generation comprises the calling transfer message of described first user terminal and the 3rd user terminal address, and this message is sent to described first user terminal behind the application server shielded address;
C. first user terminal is according to the session of the calling transfer message of receiving by application server foundation and described the 3rd user terminal;
Calling transfer message sent to first user terminal realize behind the application server shielded address among the described step B by following mode:
Calling transfer message is sent to application server, application server is preserved the 3rd user terminal address in the calling transfer message of receiving, generate the calling transfer session identification, and after covering the 3rd user terminal address in the described calling transfer message with this calling transfer session identification, send the message to first user terminal;
The foundation of first user terminal is realized by following mode with the session of the 3rd user terminal among the described step C:
First user terminal initiates to set up conversation request to application server according to the calling transfer message received, and application server sends to the 3rd user terminal with this request after covering calling transfer session identification in this request with the 3rd user terminal address of preservation;
The 3rd user terminal is according to the conversation request of receiving of setting up, by the session of application server foundation with first user terminal.
2. the method for claim 1 is characterized in that, further comprises before the described steps A:
Second user terminal is by the session between the circuit-domain network hang-up and first user terminal.
3. method as claimed in claim 2 is characterized in that, when carry out be inquiry type calling transfer the time, described second user terminal hang up and the session step of first user terminal and described steps A between further comprise:
After setting up the session between second user terminal and the 3rd user terminal and carry out one section conversation by voice call continuous server, hang up the session between second user terminal and the 3rd user terminal.
4. method as claimed in claim 3 is characterized in that, the session between described hang-up second user terminal and the 3rd user terminal is realized by following mode:
Voice call continuous server by the mode that sends updating message or heavily invite message to the 3rd user terminal notify the 3rd user terminal hang up and second user terminal between session.
5. the method for claim 1 is characterized in that, voice call continuous server is realized by following mode according to the call transfer service request generation calling transfer message of receiving among the described step B:
Voice call continuous server is according to receiving the call transfer service request, generation comprises the calling transfer message of the message header of the dialogue between sign voice call continuous server and the 3rd user terminal, and described dialogue belongs to the session between second user terminal and the 3rd user terminal.
6. method as claimed in claim 5 is characterized in that, described step C also comprises:
According to setting up the sign voice call continuous server that comprises in the conversation request and the message header of the dialogue between the 3rd user terminal, discharge the dialogue in the session between the 3rd user terminal and second user terminal.
7. method as claimed in claim 6 is characterized in that, described step C also comprises:
Discharge the relevant bearer in the session between the 3rd user terminal and second user terminal.
8. the method for claim 1 is characterized in that, described step C also comprises:
Dialogue between the voice call continuous server release and first user terminal, and the dialogue between the release and second user terminal, described two dialogues belong to the session between first user terminal and second user terminal.
9. a system that realizes call transfer service comprises first user terminal that carries out calling transfer, second user terminal, and the 3rd user terminal, the mobile switching centre of second user terminal ownership, voice call continuous server, application server, wherein,
Voice call continuous server is used to continue second user terminal respectively and the session between first user terminal and the 3rd user terminal;
Signaling when described mobile switching centre is used to handle second user terminal and first user terminal and carries out session with the 3rd user terminal and the exchange of carrying;
It is characterized in that, when second user terminal and first user terminal are set up session and are carried out calling transfer:
Voice call continuous server also is used to receive the call transfer service request that second user terminal is sent, generate the calling transfer message that comprises first user terminal and the 3rd user terminal address according to this request, and this message is sent to first user terminal through application server according to described first user terminal address;
First user terminal is used for by the session between application server foundation and the 3rd user terminal;
Application server is used for shielding the address that voice call continuous server is dealt into the calling transfer message of first user terminal, and manages the session of setting up between first user terminal and the 3rd user terminal.
10. system as claimed in claim 9 is characterized in that, described second user terminal has the transfer decision package, the type of this calling transfer that is used to make a strategic decision, and the type comprises inquiry type and blind transition.
11. system as claimed in claim 9 is characterized in that, described voice call continuous server comprises:
Contiguous unit is used for by application server second user terminal that continues, and by application server continue first user terminal and the 3rd user terminal;
The Transfer Message generation unit is used for obtaining according to the call transfer service request that second user terminal that contiguous unit receives is sent the address of first user terminal and the 3rd user terminal, generates the calling transfer message that comprises this address.
The transfer agent unit, the calling transfer message that is used for generating sends to first user terminal via application server.
12. system as claimed in claim 11 is characterized in that, described voice call continuous server further comprises:
Hang up the unit, be used for hanging up by the session between the contiguous unit and second user terminal, and hang up by the session between contiguous unit and the 3rd user terminal in inquiry type calling transfer.
13. system as claimed in claim 11 is characterized in that, described voice call continuous server further comprises:
Releasing unit is used to discharge the dialogue between the contiguous unit and first user terminal, and discharges the dialogue between the contiguous unit and second user terminal.
14. a voice call continuous server of realizing call transfer service is characterized in that, comprises contiguous unit, Transfer Message generation unit and transfer agent unit, wherein,
Contiguous unit is used for by application server second user terminal that continues, and by application server continue first user terminal and the 3rd user terminal;
The Transfer Message generation unit is used for obtaining according to the call transfer service request that second user terminal that contiguous unit receives is sent the address of first user terminal and the 3rd user terminal, generates the calling transfer message that comprises this address;
The transfer agent unit, the calling transfer message that is used for generating sends to first user terminal via application server.
15. voice call continuous server as claimed in claim 14 is characterized in that, described voice call continuous server further comprises:
Hang up the unit, be used for hanging up by the session between the contiguous unit and second user terminal, and hang up by the session between contiguous unit and the 3rd user terminal in inquiry type calling transfer.
16. voice call continuous server as claimed in claim 15 is characterized in that, described voice call continuous server further comprises:
Releasing unit is used to discharge the dialogue between the contiguous unit and first user terminal, and discharges the dialogue between the contiguous unit and second user terminal.
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