CN101287272A - Method and apparatus for implementing voice calling continuous service - Google Patents

Abstract

The invention relates to a method for realizing a voice call continuity service as well as a device and a system thereof. The method of the invention particularly includes that: in an IMS, as to a call issued in a CS domain, an IMS public subscriber identity related with an international ISDN number of a mobile subscriber is obtained by a home subscriber while the international ISDN number is identified by a calling subscriber server and the address of a service session call control function entity of the network where the calling subscriber locates is also obtained according to the IMS public subscriber identity so as to realize the corresponding calling process. Therefore, the method of the invention can determine the address of the service session call control function entity of the calling subscriber by the home subscriber service under the circumstance that a voice call continuity service application server does not obtain the address of the service session call control function entity of the network where the calling subscriber locates, which results in that the call issued by the voice call continuity service application server can be continued.

Description

A kind of method and device of realizing voice call continuity service

Technical field

The present invention relates to communication technical field, relate in particular to a kind of technology that realizes voice call continuity service.

Background technology

IMS (IP Multimedia Subsystem, the subsystem of IP multimedia service) controls and calls out the platform of control for the multimedia that provides based on PS (packet domain), and it can support conversation class and non-conversation class multimedia service.

The evolution process of mobile communications network from the 2G network to 3G network, in one period, CS (circuit domain) network of the IMS network of 3G network and 2G network will and be deposited.Under this pair of net and the application scenarios deposited, network side needs and can the perception user adhere to situation in the registration of two networks, so that as calling out need be linked into the user time, it can select suitable network (CS network or IMS) to carry out route.Simultaneously, network side also needs grappling terminal use's all-calls, so that the user can guarantee the continuity of voice communication service when switching between CS network and IMS network.

In order to satisfy the needs of above-mentioned network side, industry provides a kind of corresponding network architecture at present, in this network architecture, comprise network entity based on IMS, promptly increased a VCC AP (Voice Call Continuity Application Server in the IMS territory, application server for continuity of voice call), the realization framework of described VCC AP as shown in Figure 1, its AS as an IMS territory (application server) specifically comprises with lower module:

The territory conversion functional module, i.e. Domain Transfer Function (DTF), it is connected the calling of grappling speech business with HSS, S-CSCF entity and I-CSCF (inquiry conference call controlled function) entity;

Territory selection function module, be Domain Selection Function, it is connected with the S-CSCF (service conversation Call Control Functional Entity) at HSS (home subscriber server) and calling subscriber place, when calling need be linked into the user, it can select suitable network (CS territory or IMS territory) to carry out route;

CAMEL (mobile application power increase logic) business module, be CAMEL Service (CAMEL Svc), it is connected with the GSM Service Control Function entity, for the calling of CS Client-initiated provides an IMRN (IP multimedia domain, MMD routing number), make calling to forward the IMS territory to from the CS territory and carry out professional grappling;

Circuit domain adaptive functions module, i.e. CS Adaptation Function (CSAF), it provides and I-CSCF, S-CSCF communication interface, and calling out for CS territory Client-initiated provides corresponding adaption function.

In Fig. 1, VCC UE is a terminal with VCC professional ability, it can initiate audio call to the IMS territory by Gm, also can initiate audio call to the CS territory by the A/Iu interface, the bimodulus characteristic that promptly has, to guarantee that VCC UE all can initiate the territory switching flow again from corresponding territory under the environment of CS territory and the switching of IMS territory.

In Fig. 1, described VCC AP is as the application server in an IMS territory, and its function that mainly realizes is exactly to be used for grappling control is carried out in the calling of speech business:

If the audio call that VCC UE initiates by the IMS territory is then called out and can be routed to VCC AP by triggering iFC (initial overanxious rule) on S-CSCF, to realize grappling control.

If VCC UE initiates audio call by the CS territory, then processing procedure comprises as shown in Figure 2:

Step 1: at first, VCC user A initiates a Setup (foundation) message in the CS territory to VMSC (Visited Mobile Switching Center), to make a call, comprises the number of called subscriber B in the described message;

Step 2:VMSC triggers Calling Side CAMEL business after receiving Setup message, sends IDP (initial domain part) message to gsmSCF (GSM Service Control Function entity), and described IDP message comprises calling number and called number;

Step 3:gsmSCF by with the professional decision logic of the interaction triggers of VCC AP unit, whether decision needs to route the call to the IMS territory to realize the VCC business, if decision is routed to the IMS territory, then VCCAP distributes an IMRN (IP multimedia domain, MMD routing number) and returns to gsmSCF;

Step 4:gsmSCF sends CAP Connect (connection of CAMEL application protocol) message and gives VMSC, and described CAP Connect message comprises the purpose route ground number (being the IMRN number) that original called party number (number of called subscriber B) and VCC AP distribute;

Step 5:VMSC sends IAM (calling initial address) message to the MGCF (MGCF entity) in ownership IMS territory, described IAM message comprises numbers of calling and called parties, described calling number is the number of VCC user A, it is a MSISDN (the international integrated services digital network of a mobile subscriber) number, and described called number is the IMRN number;

Step 6:MGCF sends SIP INVITE (session initiation protocol invitation) message according to the IMRN number of called number to the I-CSCF in the corresponding ownership of IMRN IMS territory;

Described SIP INVITE comprises that calling number is that the Mobile Subscriber International ISDN Number and the called number of Tel URI form is the IMRN number of Tel URI form;

Step 7a1,7a2 and 7b:I-CSCF are routed to VCC AP by SIP route criterion;

After step 8,9:VCC AP receive INVITE (call out invite) message, the number of the initial caller VCC user A that obtains according to the IMRN number and the number of called subscriber B, and decision is carried out grappling to this session;

Step 10:VCC AP is as SIP back-to-back user agent (SIP B2BUA), representing calling subscriber A to initiate INVITE to the S-CSCF at A place calls out, wherein, calling number is the Mobile Subscriber International ISDN Number of Tel URI form, be that calling number is that a Mobile Subscriber International ISDN Number adds Tel URI form, and called number is the Mobile Subscriber International ISDN Number of the called subscriber B of Tel URI form;

Step 11: continue the subsequent voice calls flow process.

In realizing process of the present invention, the inventor finds that there is following problem at least in above-mentioned prior art:

In above-mentioned steps 10, if calling subscriber A does not register in the IMS territory, VCC AP can't be known the address of the S-CSCF at calling subscriber A place so, and then cause continuing calling procedure.

Summary of the invention

The embodiment of the invention provides a kind of method and device of realizing voice call continuity service, thereby has guaranteed the address that I-CSCF can obtain the S-CSCF at calling subscriber place, so that calling procedure can be finished smoothly.

The embodiment of the invention provides a kind of method that realizes voice call continuity service, comprising:

The calling of initiating in circuit domain is routed to Internet protocol IP multimedia subsystem, IMS territory;

In the IMS territory, by the mobile subscriber international integrated services digital network ISDN number related IMS public subscriber identification of home subscriber server acquisition with the calling subscriber who makes a call;

Obtain the address of the service conversation Call Control Functional Entity of calling subscriber place network according to described IMS public subscriber identification;

According to the address of the service conversation Call Control Functional Entity that obtains, the calling that the calling subscriber the is initiated operation that continues.

The embodiment of the invention provides a kind of realization application server for continuity of voice call, comprising:

IMS public subscriber identification acquiring unit is used for communicating by letter with home subscriber server, obtains the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num;

The message related to calls transmitting element is used for making a call according to the IMS public subscriber identification information that described IMS public subscriber identification acquiring unit obtains.

The embodiment of the invention provides a kind of inquiry conference call controlled function equipment, comprising:

Service conversation controlling call entity information acquisition unit is used for communicating by letter with home subscriber server, obtains the address of the corresponding service conversation controlling call entity of the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num;

The message related to calls processing unit, the address that is used for the service conversation controlling call entity that obtains according to described service conversation controlling call entity information acquisition unit sends the message related to calls that receives.

The embodiment of the invention provides a kind of home subscriber server, comprising:

IMS public subscriber identification determining unit is used for determining the IMS public subscriber identification related with it according to the calling subscriber's who receives mobile subscriber international ISDN num;

Service conversation controlling call entity determining unit is used for according to the IMS public subscriber identification that receives, and perhaps, according to the IMS public subscriber identification that described IMS public subscriber identification determining unit is determined, determines corresponding service conversation controlling call entity information;

Information transmitting unit is used to send the service conversation controlling call entity information that described service conversation controlling call entity determining unit is determined.

The embodiment of the invention provides a kind of system that realizes voice call continuity service, comprising:

Home subscriber server is used for determining the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num, and the address of the service conversation Call Control Functional Entity of definite IMS public subscriber identification correspondence;

Realize application server for continuity of voice call, be used for communicating by letter and obtain the IMS public subscriber identification related, and make a call according to the IMS public subscriber identification information of obtaining with calling subscriber's mobile subscriber international ISDN num with home subscriber server;

Inquiry conference call controlled entity, receive the calling that realizes that application server for continuity of voice call is sent, and communicate by letter with home subscriber server according to the IMS public subscriber identification in calling out, obtain the address of the service conversation Call Control Functional Entity of this IMS public subscriber identification correspondence, and according to the address of the service conversation Call Control Functional Entity that obtains to the calling that the receives operation that continues.

The embodiment of the invention provides a kind of system that realizes voice call continuity service, comprising:

Home subscriber server is used for determining the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num, and the address of the service conversation Call Control Functional Entity of definite IMS public subscriber identification correspondence;

Realize application server for continuity of voice call, be used to make a call, carrying calling subscriber's mobile subscriber international ISDN num in the calling of initiation;

Inquiry conference call controlled entity, be used for communicating by letter with home subscriber server according to the mobile subscriber international ISDN num of calling out, obtain the address of the pairing service conversation Call Control Functional Entity of IMS public subscriber identification of this mobile subscriber international ISDN num association, and according to the address of the service conversation Call Control Functional Entity that obtains to the calling that the receives operation that continues.

The technical scheme that is provided by the invention described above embodiment as can be seen, because embodiments of the invention obtain IMPU (the IMS Public User ldentity related with user's Mobile Subscriber International ISDN Number (mobile subscriber international ISDN num) by HSS (home subscriber server), and obtain the address of the S-CSCF (service conversation Call Control Functional Entity) of user place network according to user's IMPU the IMS public subscriber identification).Therefore, the realization of the embodiment of the invention can not known under the situation of address of S-CSCF at calling subscriber place at VCC AP, has guaranteed that HSS can find the address of the S-CSCF of caller, handles so that VCC AP can proceed corresponding call.

Description of drawings

The network entity architecture schematic diagram that Fig. 1 provides for prior art based on I MS;

Fig. 2 initiates the subsequenct call business for the user terminal that prior art provides from the CS territory handling process schematic diagram;

One of handling process schematic diagram of the method that Fig. 3 provides for the embodiment of the invention;

Two of the handling process schematic diagram of the method that Fig. 4 provides for the embodiment of the invention;

The specific implementation structural representation one of the device that Fig. 5 provides for the embodiment of the invention;

The specific implementation structural representation two of the device that Fig. 6 provides for the embodiment of the invention.

Embodiment

After calling that the calling subscriber initiates from the CS territory is by voice call continuity service application server VCCAP grappling, VCC AP serves as tripartite controlled function, make a call in the far-end representative of consumer, for this reason, VCC AP need obtain the address of calling subscriber's S-CSCF entity.

In the embodiment of the invention, if VCC AP is not known the address of the S-CSCF entity at calling subscriber place as yet, for example, the calling subscriber does not register in the IMS territory, then VCC AP need be by obtaining the IMPU sign related with calling subscriber's Mobile Subscriber International ISDN Number to HSS, and identify the address of the S-CSCF that obtains its place network according to calling subscriber's IMPU, to proceed the subsequent voice calls business.

Wherein, the described address that obtains the S-CSCF of calling subscriber place network can be by two kinds of schemes realizations.

Implementation one

In this implementation one, VCC AP sets up in the process far-end, specifically can directly adopt the IMPU sign to represent the calling subscriber to make a call as calling number;

For this reason, VCC AP need send request to HSS, with the incidence relation of request acquisition MSISDN and IMPU, specifically can obtain the IMPU of corresponding calling subscriber's MSISDN correspondence by implementation as shown in Figure 3, and this implementation specifically may further comprise the steps:

Step 1:VCC AP sends UDR (user data requests) message to the HSS of calling subscriber's ownership, wherein contains the user ID of Mobile Subscriber International ISDN Number in this message;

After step 2:HSS receives described UDR message, the IPMU of described MSISDN association is returned to VCC AP by UDA (user data is replied) message;

Be specifically as follows: after HSS receives described UDR message,, find its user data that is associated, in described user data, just include the IMPU that MSISDN is associated according to the user ID of the Mobile Subscriber International ISDN Number in the message;

Step 3:VCC AP obtains the IMPU in the message after receiving described UDA message, and directly adopts IMPU as calling subscriber identification, sends to call out to invite the I-CSCF of INVITE to calling subscriber place home network;

After step 4:I-CSCF receives described INVITE, send LIR (location information request) message, wherein include user's IMPU in the LIR message to HSS;

After step 5:HSS receives described LIR message, obtain the S-CSCF address of calling subscriber place network, and return to I-CSCF by LIA (location information answer) message according to IMPU;

Step 6:I-CSCF receives described LIA message, obtains the S-CSCF address in the message, afterwards, and according to the S-CSCF (S-CSCF in the LIA message of promptly receiving) that forwards calling subscriber place network before the INVITE of described S-CSCF address with VCC AP transmission to;

Step 7: continue the subsequent voice calls flow process, realize the subsequenct call business.

In this implementation one, because VCC AP has directly adopted the IMPU related with user MSISDN to make a call, the calling subscriber's of promptly carrying in message related to calls information is IMPU, therefore, the IMPU that also can be chosen on certain entity the calling subscriber of will carry in this message related to calls in network reverts to calling subscriber's MSISDN.

The technical scheme that provides by this implementation one makes not to be known under the situation of S-CSCF address at calling subscriber place at VCC AP, mutual by with HSS, MSISDN according to the CS territory obtains its corresponding IMPU, thereby guaranteed that I-CSCF can be according to the IMPU S-CSCF suitable for VCC user chooses, assurance VCC calls out and can proceed.

Implementation two

In this implementation, adopted the implementation of expansion HSS, so that it can find the information of corresponding S-CSCF address by user's Mobile Subscriber International ISDN Number to the processing of LIR message.

Be that HSS is after receiving LIR message, if search the address failure of S-CSCF entity of calling subscriber's MSISDN correspondence, can continue then to check whether this user ID is the MSISDN in CS territory, if be defined as MSISDN, then continue to search the IMPU that is associated with this MSISDN, and the address of the corresponding S-CSCF of further definite this IMPU, thereby assurance I-CSCF can be known the S-CSCF address of calling subscriber's MSISDN correspondence by HSS.

In this implementation, specifically can carry out the obtaining of address information of described S-CSCF by method shown in Figure 4, specifically may further comprise the steps:

Step 1:VCC AP sends to call out and invites the I-CSCF of INVITE to calling subscriber place home network, and the MSISDN that wherein adopts Tel URI form is as calling number;

After step 2:I-CSCF receives described INVITE, send LIR message, wherein contain the MSISDN of Tel URI form in the LIR message to HSS;

Step 3:HSS receives described LIR message, and finds its corresponding IMPU by the MSISDN as user ID in the message;

After step 4:HSS finds described IMPU, obtain the S-CSCF address of calling subscriber place network, and return to I-CSCF by LIA message according to described IMPU;

After step 5:I-CSCF receives described LIA message, obtain the S-CSCF address in the message, and, still adopt the MSISDN of TelURI form in the described INVITE as calling number according to the S-CSCF (being the S-CSCF in the LIA message) that forwards calling subscriber place network before the INVITE of this S-CSCF address with VCC AP transmission to;

Step 6: continue the subsequent voice calls flow process, realize the subsequenct call business.

In this implementation two, also can carry MSISDN inquiry indication information in the LIR message that sends in the described step 2, in step 3, HSS is directly according to the corresponding IMPU of the inquiry of the MSISDN in the message, and the S-CSCF address of carrying out subsequent operation acquisition MSISDN correspondence with indication; Perhaps, in described step 2, also can send the LIR message of not carrying described MSISDN inquiry indication information, like this, in step 3, HSS then inquires about the IMPU of this MSISDN association after determining directly to inquire corresponding S-CSCF address according to MSISDN, so that carry out the S-CSCF address that subsequent operation obtains the MSISDN correspondence.

This shows, the technical scheme that provides by the embodiment of the invention two can be so that do not know at VCC AP under the situation of S-CSCF address at calling subscriber place yet, I-CSCF can proceed so that VCC calls out according to the calling subscriber at the MSISDN in the CS territory S-CSCF suitable for VCC user chooses.

The embodiment of the invention also provides a kind of realization application server for continuity of voice call, specific implementation structural representation with reference to realization application server for continuity of voice call shown in Figure 5, specifically comprise IMS public subscriber identification acquiring unit and message related to calls transmitting element, wherein

(1) IMS public subscriber identification acquiring unit

This unit is used for communicating by letter with home subscriber server, obtains the IMS public subscriber identification related with calling subscriber's Mobile Subscriber International ISDN Number, and sends to the message related to calls transmitting element;

The concrete processing procedure that described IMS public subscriber identification acquiring unit obtains the IMPU related with calling subscriber's Mobile Subscriber International ISDN Number comprises:

Application server for continuity of voice call sends a request message to home subscriber server, the IMPU that the request acquisition is associated with Mobile Subscriber International ISDN Number; Described home subscriber server returns described IMPU to application server for continuity of voice call;

Perhaps,

The inquiry conference call controlled function entity of calling subscriber place home network sends a request message to HSS, and request obtains the IMPU related with calling subscriber's Mobile Subscriber International ISDN Number; Described HSS returns to described I-CSCF with described IMPU.

(2) message related to calls transmitting element

This unit specifically is used for making a call according to the IMPU information that described IMS public subscriber identification acquiring unit obtains.

The embodiment of the invention also provides a kind of home subscriber server, still with reference to shown in Figure 5, specifically comprises IMS public subscriber identification determining unit, service conversation z z z controlled entity determining unit and information transmitting unit, wherein:

IMS public subscriber identification determining unit is used for determining the IMPU related with it according to the calling subscriber's who receives Mobile Subscriber International ISDN Number;

Service conversation z z z controlled entity determining unit is used for according to the IMPU that receives, and perhaps, the IMPU according to described IMS public subscriber identification determining unit is determined determines corresponding S-CSCF;

Information transmitting unit is used to send the address information of the S-CSCF that described service conversation z z z controlled entity determining unit determines.

The embodiment of the invention also provides a kind of inquiry conference call controlled function equipment, with reference to Fig. 5 and shown in Figure 6, specifically comprises: service conversation z z z controlled entity information acquisition unit and message related to calls processing unit, wherein,

Service conversation controlling call entity information acquisition unit is used for communicating by letter with home subscriber server, obtains the address of the corresponding S-CSCF entity of the IMPU related with calling subscriber's Mobile Subscriber International ISDN Number, and sends the message related to calls processing unit; In this unit, be specifically as follows the address that directly obtains its corresponding S-CSCF entity to HSS with the IMS public subscriber identification, perhaps, also can adopt MSISDN to obtain the address of corresponding S-CSCF entity to HSS, at this moment, specifically find corresponding IMPU number according to MSISDN, determine corresponding S-CSCF address according to the IMPU number more afterwards by HSS;

The message related to calls processing unit, the address that is used for the S-CSCF entity that obtains according to described service conversation controlling call entity information acquisition unit sends the message related to calls that receives.

The embodiment of the invention also provides a kind of system that realizes voice call continuity service, still with reference to shown in Figure 5, specifically comprises home subscriber server, realizes application server for continuity of voice call and inquiry conference call controlled entity:

Home subscriber server is used for determining the IMPU related with calling subscriber's Mobile Subscriber International ISDN Number, and the address of the S-CSCF entity of definite IMPU correspondence;

Realize application server for continuity of voice call, be used for communicating by letter and obtain and the related IMPU of calling subscriber's Mobile Subscriber International ISDN Number, and make a call according to the IMPU that obtains with HSS;

Inquiry conference call controlled entity, receive the calling that realizes that application server for continuity of voice call is sent, and communicate by letter with HSS according to the IMPU in calling out, obtain the address of the S-CSCF entity of this IMPU correspondence, and according to the address of the S-CSCF entity that obtains to the calling of the reception operation that continues.

The embodiment of the invention also provides a kind of system that realizes voice call continuity service, and as shown in Figure 6, its specific implementation structure comprises:

Home subscriber server is used for determining the IMPU related with calling subscriber's Mobile Subscriber International ISDN Number, and the address of the S-CSCF entity of definite IMPU sign indicating number correspondence;

Realize application server for continuity of voice call, be used to make a call, carrying calling subscriber's Mobile Subscriber International ISDN Number in the calling of initiation;

Inquiry conference call controlled entity, be used for communicating by letter with home subscriber server according to the Mobile Subscriber International ISDN Number of calling out, obtain the address of the pairing S-CSCF entity of IMPU of this Mobile Subscriber International ISDN Number association, and according to the address of the S-CSCF entity that obtains to the calling that the receives operation that continues.

In sum, the various specific implementations that the embodiment of the invention provides also can still can guarantee normally carrying out of voice call continuity service so that do not know at VCCAP under the situation of S-CSCF address at calling subscriber place.That is to say that I-CSCF can proceed so that VCC calls out according to the calling subscriber at the MSISDN in the CS territory S-CSCF suitable for VCC user chooses; Perhaps, VCC AP mutual by with HSS obtains its corresponding IMPU according to the MSISDN in CS territory, can be that VCC user chooses suitable S-CSCF according to the IMPU that obtains to guarantee I-CSCF, can proceed so that VCC calls out.

Therefore, the realization of the embodiment of the invention has effectively guaranteed the reliability of voice call continuity service.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present 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 (9)

1, a kind of method that realizes voice call continuity service is characterized in that, comprising:

The calling of initiating in circuit domain is routed to Internet protocol IP multimedia subsystem, IMS territory;

In the IMS territory, by the mobile subscriber international integrated services digital network ISDN number related IMS public subscriber identification of home subscriber server acquisition with the calling subscriber;

Obtain the address of the service conversation Call Control Functional Entity of calling subscriber place network according to described IMS public subscriber identification;

According to the address of the service conversation Call Control Functional Entity that obtains, the calling that the calling subscriber the is initiated operation that continues.

2, method according to claim 1 is characterized in that, the step of the IMS public subscriber identification that described acquisition is related with calling subscriber's mobile subscriber international ISDN num specifically comprises:

Application server for continuity of voice call sends a request message to home subscriber server, and request obtains the IMS public subscriber identification that is associated with the calling subscriber's that comprises mobile subscriber international ISDN num in this request message; Described home subscriber server returns described IMS public subscriber identification to application server for continuity of voice call; Perhaps,

The inquiry conference call controlled function entity of calling subscriber place home network sends a request message to home subscriber server, and request obtains the IMS public subscriber identification that is associated with the calling subscriber's that comprises mobile subscriber international ISDN num in this request message; Described home subscriber server obtains the IMS public subscriber identification related with it according to described calling subscriber's mobile subscriber international ISDN num.

3, method according to claim 2 is characterized in that, the step of the address of the service conversation Call Control Functional Entity of described acquisition calling subscriber place network specifically comprises:

The voice call continuity service application server sends message to the inquiry conference call controlled function entity of calling subscriber place home network, and the calling subscriber identification of described message is the IMS public subscriber identification; After inquiry conference call controlled function entity is received described message, carry out alternately the address of the service conversation Call Control Functional Entity of acquisition calling subscriber place network according to calling subscriber's IMS public subscriber identification and home subscriber server; Perhaps,

Home subscriber server is determined the IMS public subscriber identification related with it according to calling subscriber's mobile subscriber international ISDN num, and the address of the service conversation Call Control Functional Entity corresponding with this IMS public subscriber identification, return to the inquiry conference call controlled function entity of calling subscriber's home network; Described inquiry conference call controlled function entity obtains the address of service conversation Call Control Functional Entity of calling subscriber's mobile subscriber international ISDN num correspondence.

4, method according to claim 3, it is characterized in that, described inquiry conference call controlled function entity also comprises mobile subscriber international ISDN num inquiry indication information according to the calling subscriber's who obtains mobile subscriber international ISDN num in home subscriber server transmission message, inquire about corresponding IMS public subscriber identification with the indication home subscriber server according to the mobile subscriber international ISDN num in the message.

5, a kind of realization application server for continuity of voice call is characterized in that, comprising:

IMS public subscriber identification acquiring unit is used for communicating by letter with home subscriber server, obtains the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num;

The message related to calls transmitting element is used for making a call according to the IMS public subscriber identification information that described IMS public subscriber identification acquiring unit obtains.

6, a kind of inquiry conference call controlled function equipment is characterized in that, comprising:

Service conversation controlling call entity information acquisition unit is used for communicating by letter with home subscriber server, obtains the address of the corresponding service conversation controlling call entity of the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num;

The message related to calls processing unit, the address that is used for the service conversation controlling call entity that obtains according to described service conversation controlling call entity information acquisition unit sends the message related to calls that receives.

7, a kind of home subscriber server is characterized in that, comprising:

IMS public subscriber identification determining unit is used for determining the IMS public subscriber identification related with it according to the calling subscriber's who receives mobile subscriber international ISDN num;

Service conversation controlling call entity determining unit is used for according to the IMS public subscriber identification that receives, and perhaps, according to the IMS public subscriber identification that described IMS public subscriber identification determining unit is determined, determines corresponding service conversation controlling call entity information;

Information transmitting unit is used to send the service conversation controlling call entity information that described service conversation controlling call entity determining unit is determined.

8, a kind of system that realizes voice call continuity service is characterized in that, comprising:

Home subscriber server is used for determining the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num, and the address of the service conversation Call Control Functional Entity of definite IMS public subscriber identification correspondence;

Realize application server for continuity of voice call, be used for communicating by letter and obtain the IMS public subscriber identification related, and make a call according to the IMS public subscriber identification information of obtaining with calling subscriber's mobile subscriber international ISDN num with home subscriber server;

Inquiry conference call controlled entity, receive the calling that realizes that application server for continuity of voice call is sent, and communicate by letter with home subscriber server according to the IMS public subscriber identification in calling out, obtain the address of the service conversation Call Control Functional Entity of this IMS public subscriber identification correspondence, and according to the address of the service conversation Call Control Functional Entity that obtains to the calling that the receives operation that continues.

9, a kind of system that realizes voice call continuity service is characterized in that, comprising:

Home subscriber server is used for determining the IMS public subscriber identification related with calling subscriber's mobile subscriber international ISDN num, and the address of the service conversation Call Control Functional Entity of definite IMS public subscriber identification correspondence;

Realize application server for continuity of voice call, be used to make a call, carrying calling subscriber's mobile subscriber international ISDN num in the calling of initiation;

Inquiry conference call controlled entity, be used for communicating by letter with home subscriber server according to the mobile subscriber international ISDN num of calling out, obtain the address of the pairing service conversation Call Control Functional Entity of IMS public subscriber identification of this mobile subscriber international ISDN num association, and according to the address of the service conversation Call Control Functional Entity that obtains to the calling that the receives operation that continues.

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