CN101262414A - Domain switch method in continuous voice call service - Google Patents
Domain switch method in continuous voice call service Download PDFInfo
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- CN101262414A CN101262414A CNA2007100797447A CN200710079744A CN101262414A CN 101262414 A CN101262414 A CN 101262414A CN A2007100797447 A CNA2007100797447 A CN A2007100797447A CN 200710079744 A CN200710079744 A CN 200710079744A CN 101262414 A CN101262414 A CN 101262414A
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Abstract
The invention discloses a domain switching method in a voice call continuous service, which comprises the following steps: a VCC application obtains a VDN from a presetting VDN set to distribute the VDN to an IMS dialogue and VCC users are in the active IMS dialogue; VCC users apply the distributed VDN as a called number to make a voice call from a CS domain, requesting the switching of the IMS dialogue to the CS domain, and a call used for making the voice call builds a calling number in request message as the number of users asking for switching; a VMSC triggers a CAMEL service calling process and sends the calling number in the switching request and the VDN to the VCC application; the VCC application determines the IMS dialogue to be switched according to the calling number and the VDN, and distributes corresponding DTF PSI and sends back to the VMSC; the VMSC uses the DTF PSI as the called number and sends a dialogue establishment request to the VCC application; the VCC application determines the IMS dialogue to be switched according to the DTF PSI.
Description
Technical field
The present invention relates to the communications field, and especially, relate to the domain switch method in a kind of voice call continuity service.
Background technology
Utilize IP Multimedia System (IP Multimedia Core Network Subsystem, abbreviation IMS) technology can realize the real-time voice transmission on packet network, provide and circuit domain (Circuit Switched Domain, CS) the similar business of speech business.This business is combined with traditional circuit domain speech business, can provide fixing mobile fused business for the user, to satisfy the growing communication need of user.
For example, at WLAN (wireless local area network) (Wireless Local Area Network, WLAN) occasions such as the Office Area of technology extensive use, focus, family, the user uses and (for example supports circuit domain, the bimodulus or the multimode user terminal equipment of global system for mobile communications (Global System for MobileCommunications, GSM)) and WLAN access way; In the area that has WLAN to cover, insert the WLAN base station by the WLAN mode and carry out voice communication, after the user shifts out the WLAN service area, can roam into the communication of the enterprising lang sound of mobile cellular network again, and can carry out seamless switching by between, vice versa.
Voice call continuity service (Voice Call Continuity, VCC) can support above-mentioned application scenarios, its can control simultaneously the voice communication of CS territory with based on the packet network voice communication of IMS framework, and realize seamless switching between the two, thereby guaranteed the continuity of voice call.
The VCC business has the following advantages: (1) strengthens the indoor wireless service and covers; (2) voice call transfer of the wireless communication networks of a part of circuit mode is come to packet networks such as WLAN, can alleviate the pressure of the Radio Resource of wireless communication networks in the grouping overlay area; (3) provide the multiple business pattern, increase professional income; And (4) can adopt the IMS framework that fused business is provided.
In the IMS territory, introduce VCC and use (VCC Application), control the audio call process of VCC subscriber equipment, and realize the switching between control CS territory and the IMS calling in central controlled mode.
Fig. 1 shows the reference framework of VCC business.As shown in Figure 1, it has increased the VCC application in original IMS framework, whole VCC framework comprises: VCC subscriber equipment 101, VCC application 102, CS territory equipment and IMS equipment, wherein, CS territory equipment comprises Visited Mobile Switching Center (Visited Mobile Switching Centre, VMSC) 107, GMSC (gateway mobile switching center) (Gateway Mobile Switching Centre, GMSC) 108 (being used to the VCC subscriber equipment to provide the CS territory to insert and service); IMS equipment comprises Proxy Call Session Control Function (Proxy Call Session Control Function, P-CSCF) 110, query call conversation control function (Interrogating Call SessionControl Function, I-CSCF) 111, service call conversation control function (Serving CallSession Control Function, S-CSCF) 112, home subscriber server (HomeSubscriber Server, HSS) 113, MGCF (Media GatewayControl Function, MGCF) 114 (be used to the VCC user terminal to provide IMS to insert and service, provide session control for VCC uses simultaneously, functions such as route service).
Comprise also in this framework that VCC uses, this is the control core of VCC business, is used to provide functions such as calling grappling, territory selection, territory switching.
In addition, this framework further comprises: and GSM Service Control Function (GSM ServiceControl Function, gsmSCF) 117, this function is used with VCC and is cooperated, the route that control CS calls out in the territory; And, this framework provide simultaneously with public switch telephone network/Public Land Mobile Nerwork (Public Switched Telephone Network/Public Land MobileNetwork, PSTN/PLMN) 116 with the intercommunication of other IP multi-media networks 115.
As shown in the figure, VCC uses and comprises four functional entitys, can cooperatively interact and finish the VCC business, and these four functional entitys comprise:
(1) mobile network strengthens customized application logic (Customised Application forMobile network Enhanced Logic, CAMEL) service application 103, with the collaborative work of CS adaption function, finish rising of CS territory called for the function that the summation handoff request is routed to the VCC application;
(2) territory selection function (Domain Selection Function, DSF) 105, according to rules such as status of user equipment, user preferences, carrier policy, be one and go into to exhale to select a suitable access way (CS territory or IMS packet domain), and call out the VCC subscriber equipment by selected territory;
(3) the CS adaption function (CS Adaptation Function, CSAF) 104, when the VCC subscriber equipment when exhale in the CS territory, serve as the user agent, set up and the getting in touch of territory handoff functionality;
(4) the territory handoff functionality (Domain Transfer Function, DTF) 106, in calling procedure, according to the request and the switchover policy of VCC subscriber equipment, control the just switching of the calling in communication process between CS territory and IMS.
And the operation flow of VCC comprises registration, rise exhale, exhale eventually, handoff procedure.
Still the continuity that keeps audio call between CS territory and IMS territory when wherein, the territory handoff functionality can make VCC subscriber equipment (UE) switch.For example, when the user carries out session by IMS, subscriber terminal equipment detects the packet radio environment and (for example changes, leave WLAN coverage), can't satisfy the requirement of speech communication, subscriber terminal equipment can utilize VCC territory Handover Number (VCC Domain TransferNumber according to switchover policy, VDN) make a call from the CS territory, request switches to the CS territory from the IMS territory.
Wherein, VDN has two kinds of collocation methods: static configuration method and dynamic assignment method.The static configuration method is pre-configured or by equipment control mode Remote configuration VDN in subscriber equipment; The dynamic-configuration method is to set up session or in registration process or when initiating handoff request, be user's dynamic assignment VDN by network at subscriber equipment, determines the session of user in IMS uniquely according to this VDN.
In the implementation procedure of dynamic assignment method, network is necessary for the dynamic VDN collection of VCC traffic assignments, guarantees to anchor to unique VDN of IMS session distribution that VCC uses for each.In addition can be by configuration CAMEL business datum, making called number is that the handoff request of dynamic VDN is not triggered to the CAMEL business, makes handoff request be routed directly to IMS from VMSC.
Fig. 2 shows the switching flow of dynamic assignment VDN.As shown in Figure 2, may further comprise the steps:
Step S201, UE are in the IMS session of an activation, and anchor to the VCC application;
Step S202, VCC are applied as the IMS session and distribute unique dynamic VDN, set up the corresponding relation between dynamic VDN and the IMS session;
Step S203, UE use the VDN of dynamic assignment to initiate audio call from the CS territory, and request switches to the CS territory from the IMS territory, if UE is not attached to the CS territory, then need carry out CS territory attaching process before making a call;
Step S204, VMSC receives setup requests, according to the CAMEL business configuration, carries out initial call and triggers logic;
Step S205 according to the CAMEL business configuration, is that the calling of dynamic VDN will not trigger the CAMEL business to called number, therefore can directly according to VDN call request be sent to the MGCF of user attaching network;
Step S206, MGCF sends session to I-CSCF and sets up request;
Before can adopting two kinds of different modes of step 307a and 307b with session foundation request, step S207, I-CSCF forward the territory handoff functionality in the VCC application to;
Before directly setting up session and ask, step S207a, I-CSCF forward the territory handoff functionality in the VCC application to;
Step S207b1, I-CSCF forward S-CSCF to before request is set up in session;
Before asking session foundation, step S207b2, S-CSCF forward the territory handoff functionality in the VCC application to;
Step S208, the territory handoff functionality is according to the definite IMS session that will switch of VDN;
Step S209, territory handoff functionality carry out switch logic, the connection of original IMS is switched to and being connected of newly-built CS territory, and discharge original IMS and connect.
From top description as can be seen, the dynamic assignment method is distributed a VDN for each session, UE directly uses dynamic VDN to initiate handoff request from the CS territory, because VDN can identify the IMS session that anchors in the VCC application uniquely, therefore VCC uses and can utilize dynamic VDN to determine the pairing session of this handoff request uniquely, thereby can solve at Chi Qianzhuan, share in the business scenario such as number might there be a plurality of grapplings simultaneously in a user in VCC uses session, and can't determine the problem of the IMS session that will switch by the static allocation method.But, owing in conversation procedure, will take VDN always, can make the mode of dynamic assignment VDN take more number resource, for example, there were 10000 sessions simultaneously in maximum during a VCC used, and therefore will distribute 10000 numbers to use to VCC at least.
As seen through the above analysis, the dynamic assignment method have can unique definite session characteristics, but have the many problems of number resource that take.Yet, do not propose as yet at present to solve the technical scheme that the dynamic assignment method takies the problem of more number resource.
Summary of the invention
Consider the problems referred to above and make the present invention, main purpose of the present invention is to provide the domain switch method in a kind of voice call continuity service.
According to one embodiment of present invention, provide domain switch method in a kind of voice call continuity service.
This method may further comprise the steps: first step, VCC are used to concentrate from default VDN and are obtained VDN and distribute to the IMS session, and wherein, VCC user is in the IMS session of activation; Second step, VCC user uses the VDN of distribution to initiate audio call from the CS territory as called number, request switches to the CS territory with the IMS session, wherein, is used for initiating the user's telephone number that the calling number of the call setup request message of audio call is switched for request; Third step, in response to handoff request, VMSC triggers CAMEL server call process, and calling number in the handoff request and VDN are sent to the VCC application; The 4th step, VCC uses according to calling number and the definite IMS session that will switch of VDN, distributes corresponding D TF PSI and it is returned to VMSC; The 5th step, VMSC uses send session foundation request as called number to VCC with DTF PSI; And the 6th step, VCC uses according to DTF PSI and determines the IMS session that will switch, carries out handoff procedure.
Wherein, before first step, set in advance the VDN collection that is used for the VCC application, wherein, VDN concentrates and comprises one section or a series of VDN, and each VDN can distribute to different VCC users simultaneously.VDN concentrates the number of the VDN that comprises to be not less than a user and allows simultaneous maximum number of sessions.
And in first step, VCC uses the VDN that obtains the unallocated VCC user of giving, and with the VDN notice VCC user who distributes.In addition, in first step, VCC uses the mapping relations between number, VDN and the IMS session of setting up VCC user.
In addition, in third step, VMSC sends to gsmSCF by initial foundation point message with calling number in the handoff request and VDN, and gsmSCF calls the VCC application afterwards, sends calling number and VDN to the VCC application.
In the 4th step, VCC uses DTF PSI is returned gsmSCF, and gsmSCF returns to VMSC by connection message with DTF PSI afterwards, and indication VMSC sends to VCC according to DTF PSI with setup requests and uses.
In addition, after the 6th step, when the IMS conversation end, VCC uses and is released in the VDN that distributes in the first step.
After second step, when the VCC that calling number can be sent to the IMS network of ownership at network used, proceed to following steps: the VCC that step a, VMSC utilize VDN to route the call to the IMS network of ownership used; Step b, VCC use according to calling number and the definite IMS session that will switch of VDN, carry out handoff procedure.
Wherein, when the voice call continuity service that calling number can be sent to the IP Multimedia System network of ownership at network is used, the mobile network strengthens customized application logic business caller process business datum by configuration, Visited Mobile Switching Center is received do not trigger the mobile network when called number is the calling of voice call continuity service territory Handover Number to strengthen the customized application logic business.
In the method, VCC user anchors to the user that VCC uses, can be following any: user, terminal equipment.
By technique scheme of the present invention, can when satisfy the professional demand of switching of call continuity, effectively solve dynamic VDN distribution method and take the many defectives of number resource.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of VCC business;
Fig. 2 is the flow chart that uses dynamic assignment VDN mode to switch to CS from IMS in the correlation technique;
Fig. 3 is the flow chart according to the domain switch method in the voice call continuity service of the embodiment of the invention; And
Fig. 4 is the signaling process figure according to the application example of the domain switch method in the voice call continuity service of the embodiment of the invention.
Embodiment
Embodiments of the invention are described below with reference to accompanying drawings.
In an embodiment of the present invention, provide domain switch method in a kind of voice call continuity service.
As shown in Figure 3, may further comprise the steps according to the domain switch method in the voice call continuity service of the embodiment of the invention: step S302, VCC use to concentrate from default VDN and obtain VDN and distribute to the IMS session, and wherein, VCC user is in the IMS session of activation; Step S304, VCC user uses the VDN of distribution to initiate audio call from the CS territory as called number, request switches to the CS territory with the IMS session, wherein, is used for initiating the user's telephone number that the calling number of the call setup request message of audio call is switched for request; Step S306, in response to handoff request, VMSC triggers CAMEL server call process, and calling number in the handoff request and VDN are sent to the VCC application; Step S308, VCC use according to calling number and the definite IMS session that will switch of VDN, distribute corresponding D TF PSI and it is returned to VMSC; Step S310, VMSC uses send session foundation request as called number to VCC with DTF PSI; And step S312, VCC uses the definite IMS session that will switch according to DTF PSI, carries out handoff procedure.
Wherein, before step S302, set in advance the VDN collection that is used for the VCC application, wherein, VDN concentrates and comprises one section or a series of VDN, and each VDN can distribute to different VCC users simultaneously.And VDN concentrates the number of the VDN that comprises to be not less than a user and allows simultaneous maximum number of sessions.
And in step S302, VCC uses the VDN that obtains the unallocated VCC user of giving, and with the VDN notice VCC user who distributes.Alternatively, the number that VDN concentrates can be distributed to different users or terminal equipment simultaneously, that is to say that same VDN number can be used simultaneously by different users or terminal equipment, but the different IMS session of same user or terminal equipment must be used different VDN.In addition, in step S302, VCC uses the mapping relations between number, VDN and the IMS session of setting up VCC user.
In addition, in step S306, VMSC sends to gsmSCF by initial foundation point message with calling number in the handoff request and VDN, and gsmSCF calls the VCC application afterwards, sends calling number and VDN to the VCC application.
In step S308, VCC uses DTF PSI is returned gsmSCF, and gsmSCF returns to VMSC by connection message with DTF PSI afterwards, and indication VMSC sends to VCC according to DTF PSI with setup requests and uses.
In addition, after step S312, when the IMS conversation end, VCC uses and is released in the VDN that distributes in the first step.
After step S304, when the VCC that calling number can be sent to the IMS network of ownership at network uses, by configuration CAMEL server call process business datum, VMSC is received do not trigger the CAMEL business when called number is the calling of VCC territory Handover Number, carry out following steps: step a this moment, the VCC that VMSC utilizes VDN to route the call to the IMS network of ownership uses; Step b, VCC use according to calling number and the definite IMS session that will switch of VDN, carry out handoff procedure.
In the method, VCC user be anchor to user that VCC uses can be following any: user, terminal equipment.
And,, can also reuse VDN if in same conversation procedure, exist repeatedly from the handoff procedure between IMS and the CS.
Below with reference to the method for instantiation description according to the embodiment of the invention.
Fig. 4 shows according to the signaling process of the domain switch method in the voice call continuity service of the embodiment of the invention in the middle of practical application.Wherein emphasis has been described the process that the dynamic VDN of improved use switches, especially to the processing procedure of dynamic VDN.Dynamic assignment VDN method in the correlation technique anchors to unique VDN of IMS session distribution that VCC uses for each, and be that the IMS session that VCC uses that anchors to for same VCC subscriber terminal equipment distributes different VDN according to the method for present embodiment, and same VDN can be multiplexing by different user or terminal equipment.
In order to guarantee the realization of handoff procedure, with described step S302 is identical before, for the special VDN collection of VCC traffic assignments planning, comprise one section or a series of VDN number at home network, in using, VCC disposes and safeguards this dynamic VDN collection simultaneously.The CAMEL business datum is set simultaneously, and when making VMSC receive VCC user's handoff request, it is professional to the VCC application to trigger CAMEL.
As shown in Figure 4, it specifically may further comprise the steps:
Step S401, subscriber equipment are in the IMS session of an activation, and anchor to the VCC application;
Step S402, VCC uses from dynamic VDN and concentrates the VDN number that obtains unallocated this user of giving, and distributes to this VCC session, sets up the corresponding relation between VCC Subscriber Number, dynamic VDN and the VCC session, and notifying user equipment;
Step S403, subscriber equipment use the VDN of dynamic assignment to initiate audio call from the CS territory, and request switches to CS territory (if UE is not attached to the CS territory, then need carry out CS territory attaching process before making a call) from the IMS territory;
Step S404, VMSC receives setup requests, according to the CAMEL business configuration, carry out initial call and trigger logic, calling number can be sent to (comprising access zone network, intermediate conveyor network) the IMS network of ownership if confirm network, and can be by configuration CAMEL business datum, VMSC is received do not trigger the CAMEL business when called number is the calling of VDN, then directly utilize VDN that handoff request is sent to the MGCF of user attaching network, the processing of this moment jumps directly to step S409;
Step S405, VMSC send the Initial Detection Point request message according to the initial call trigger point to gsmSCF, carry the calling number and the VDN of handoff request in the message;
Step S406, gsmSCF calls the VCC application function, VCC uses according to calling number in the handoff request and VDN, with and the VCC Subscriber Number safeguarded, dynamically the corresponding relation between VDN and the IMS session is determined the IMS session that will switch, distribute DTF PSI, set up and the IMS session corresponding relation that is anchored in the VCC application, and allocation result returned gsmSCF, wherein, VCC application meeting is according to factors such as whether carrier policy, IMS session exist, judge whether to accept this handoff request, if accept the normal flow described in the execution in step S406; Otherwise send refuse information to VMSC by gsmSCF, notice VMSC refusal handoff request;
Step S407, gsmSCF sends connection response to VMSC, comprises DTFPSI in the response, and the VCC that indication VMSC routes the call among the IMS uses;
Step S408, VMSC send to call request according to DTF PSI the MGCF of user attaching network;
Step S409, MGCF sends session to I-CSCF and sets up request;
Before can adopting two kinds of different modes of step 410a and 410b with session foundation request, step S410, I-CSCF forward the territory handoff functionality in the VCC application to;
Before directly setting up session and ask, step S410a, I-CSCF forward the territory handoff functionality in the VCC application to;
Step S410b1, I-CSCF forward S-CSCF to before request is set up in session;
Before asking session foundation, step S410b2, S-CSCF forward the territory handoff functionality in the VCC application to;
Step S411, territory handoff functionality during VCC uses is according to the definite IMS session that will switch of DTF PSI, here, if adopt among the step S404 according to the method for the direct route of VDN, the territory handoff functionality during VCC uses is determined the IMS session that will switch according to calling number in VDN and the handoff request;
Territory handoff functionality during step S412, VCC use is carried out switch logic, switches to and being connected of newly-built CS territory through the connection of original IMS, and discharges original IMS and connect.
When conversation end, VCC uses this user of release this VDN is taken.Equally, if took place repeatedly to switch between IMS and the CS in a conversation procedure, VDN can repeatedly use.
In sum, the present invention is the handoff process of the VCC of IP Multimedia System business from the IMS territory to the CS territory, adopted dynamic VDN number collection can distribute to the method for different VCC subscriber terminal equipments simultaneously, determine unique relationships with the IMS session jointly by VCC Subscriber Number and VDN, make by the unique definite session that will switch of the switching energy of dynamic VDN initiation, have simultaneously and take the few characteristics of number resource, satisfy the demand of call continuity service switch process.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the domain switch method in the voice call continuity service, it is characterized in that, comprise: first step, voice call continuity service is used to concentrate from default voice call continuity service territory Handover Number and is obtained voice call continuity service territory Handover Number and distribute to the IP Multimedia System session, wherein, the voice call continuity service user is in the described IP Multimedia System session of activation;
Second step, described voice call continuity service user uses the described voice call continuity service territory Handover Number of distribution to initiate audio call as called number from circuit domain, request switches to circuit domain with described IP Multimedia System session, wherein, be used for initiating the user's telephone number that the calling number of the call setup request message of audio call is switched for request;
Third step, in response to described handoff request, Visited Mobile Switching Center triggers the mobile network and strengthens customized application logic business caller process, and described calling number in the described handoff request and described voice call continuity service territory Handover Number are sent to described voice call continuity service application;
The 4th step, described voice call continuity service is used according to described calling number and the definite described IP Multimedia System session that will switch of described voice call continuity service territory Handover Number, distribute corresponding territory handoff functionality PSI, and it is returned to described Visited Mobile Switching Center;
The 5th step, described Visited Mobile Switching Center is used send session foundation request as called number to voice call continuity service with described territory handoff functionality PSI; And
The 6th step, voice call continuity service are used the definite described IP Multimedia System session that will switch according to described territory handoff functionality PSI, carry out handoff procedure.
2. domain switch method according to claim 1, it is characterized in that, before described first step, set in advance and be used for the described voice call continuity service territory Handover Number collection that voice call continuity service is used, wherein, described voice call continuity service territory Handover Number is concentrated and is comprised one section or a series of voice call continuity services territory Handover Number, and each voice call continuity service territory Handover Number can be distributed to different voice call continuity service users simultaneously.
3. domain switch method according to claim 2, it is characterized in that described voice call continuity service territory Handover Number is concentrated the number of the described voice call continuity service territory Handover Number that comprises to be not less than a user and allowed simultaneous maximum number of sessions.
4. domain switch method according to claim 1, it is characterized in that, in described first step, the voice call continuity service application is obtained unallocated to described voice call continuity service user's voice call continuity business domains Handover Number, and the described voice call continuity service territory Handover Number that will distribute is notified described voice call continuity service user.
5. domain switch method according to claim 1, it is characterized in that, in described first step, voice call continuity service is used the mapping relations of setting up between described voice call continuity service user's number, described voice call continuity service territory Handover Number and the described IP Multimedia System session.
6. domain switch method according to claim 1, it is characterized in that, in described third step, described Visited Mobile Switching Center sends to described calling number in the described handoff request and described voice call continuity service territory Handover Number as the global system for mobile communications service control function by initial foundation point message, described afterwards call as the global system for mobile communications service control function as described in voice call continuity service use, send described calling number and described voice call continuity service territory Handover Number to described voice call continuity service and use.
7. domain switch method according to claim 6, it is characterized in that, in described the 4th step, described voice call continuity service is used and is returned described territory handoff functionality PSI described as the global system for mobile communications service control function, described afterwards as the global system for mobile communications service control function by connection message with as described in territory handoff functionality PSI return to as described in Visited Mobile Switching Center, indicate described Visited Mobile Switching Center described setup requests to be sent to described voice call continuity service and use according to described territory handoff functionality PSI.
8. according to each described domain switch method in the claim 1 to 7, it is characterized in that, after described the 6th step, when described IP Multimedia System conversation end, described voice call continuity service is used and is released in the described voice call continuity service territory Handover Number that distributes in the described first step.
9. domain switch method according to claim 1, it is characterized in that, after described second step, when the voice call continuity service that described calling number can be sent to the IP Multimedia System network of ownership at network is used, proceed to following steps:
Step a, described Visited Mobile Switching Center utilize described voice call continuity service territory Handover Number to route the call to the described IP Multimedia System voice-over-net call continuity service application of ownership;
Step b, described voice call continuity service use according to described calling number and the definite described IP Multimedia System session that will switch of described voice call continuity service territory Handover Number, carry out handoff procedure.
10. domain switch method according to claim 9, it is characterized in that, when the voice call continuity service that described calling number can be sent to the IP Multimedia System network of ownership at network is used, the mobile network strengthens customized application logic business caller process business datum by configuration, Visited Mobile Switching Center is received do not trigger the mobile network when called number is the calling of voice call continuity service territory Handover Number to strengthen the customized application logic business.
11., it is characterized in that described voice call continuity service user anchors to the user that described voice call continuity service is used according to each described domain switch method in the claim 1 to 10, be following any: user, terminal equipment.
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| CN102088681B (en) * | 2009-12-03 | 2014-11-05 | 华为技术有限公司 | Method, equipment and system for processing voice call continuity service |
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| CN100352295C (en) * | 2005-01-24 | 2007-11-28 | 华为技术有限公司 | Method for realizing IP multi media sub-system conversation falling to circuit switching call |
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| WO2006138736A2 (en) * | 2005-06-15 | 2006-12-28 | Azaire Networks Inc. | Voice call continuity application server between ip-can and cs networks |
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