CN100493255C

CN100493255C - A system and method for realizing the call service based on voice service continuity

Info

Publication number: CN100493255C
Application number: CNB2006100546247A
Authority: CN
Inventors: 段小琴; 朱东铭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-02-07
Filing date: 2006-02-07
Publication date: 2009-05-27
Anticipated expiration: 2026-02-07
Also published as: CN101018400A

Abstract

The provided system and method for calling business based on dialogue business continuity comprises: an application server with IMS-NeDS function generates indication message for direct succeeding the calling to the called terminal when determining it requires to transmit the calling from IMS domain to CS domain and succeed to the called terminal, and enables network device in system clear decide whether this calling is anchored in IMS domain. This invention prevents repeated route cycle for calling, and improves calling success ratio.

Description

A kind of system and method for the realization call business based on phone service continuity

Technical field

The present invention relates to the network communications technology field, be specifically related to a kind of system and method for the realization call business based on phone service continuity.

Background technology

From 3GPP R5 (3rd Generation Partnership Project, 3rd Generation Partnership Project) stage, UMTS (universal mobile telecommunications system) core net is divided into CS (circuit switching), PS (packet switching) and three subsystems of IMS (IP Multimedia System).

CS territory (Circuit Switched Domain, circuit commutative field) is used for providing to the user connection of Circuit Service.The CS territory mainly comprises: MSC (MSC Server/CS-MGW, Mobile Switch CenterServer/CS-Media GateWay, Mobile Switching Center Server/circuit domain-media gateway), GMSC (Gateway MSC, gateway MSC) and IWF (InterWorking Function, IWF).Wherein, MSC finishes the exchange and the signaling controlled function of circuit switched type business; GMSC is the MSC that finishes mobile subscriber's routing addressing function in a certain network, can close with MSC if set up separately; IWF and MSC are closely related, finish the signaling translation function between PLMN (public land mobile net) and ISDN (integrated services digital network), PSTN (public telephone switching network), PDN (Packet Data Network packet data network), thereby the realization network interworking, the concrete function of IWF is closely related with the kind of professional and network.

PS territory (Packet Switched Domain, packet-switched domain) be used for providing to the user connection of packet-type business, the PS territory mainly comprises: GSN (GPRS Support Node), BG (borde gateway), HLR/AuC (Home Location Register/authentication center), VLR (VLR Visitor Location Register), EIR (equipment identity register), MSC etc.Wherein, GSN comprises SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node), and is used to finish the transmission of Packet Service user's grouping bag; SGSN provides being connected of core net and wireless access system BSS, RNS, finishes the functions such as mobile management, session management of multicomponent data business, with management MS moving and communication service in the mobile network; GGSN is the interface between mobile communication system and other public data network, and simultaneously, GGSN also has the function of inquiring position information.In addition, SGSN and GGSN all provide charge information.BG be used to finish two between GPRS network intercommunication, guarantee the fail safe of network interworking.HLR is used to finish the management of user contracting data and positional information, user contracting data such as MSISDN, IMSI, PDP ADDRESS, signatory telecommunication service and supplementary service and the professional scope of application thereof etc., positional information such as MSRN, MSC/VLR number, SGSN number, GMLC etc.AUC is mainly used in storage user's authentication arithmetic and key.VLR is used to handle the various data messages of visitor.EIR is used to store customer equipment identification IMEI information.

IMS is a subsystem that is superimposed upon in the WCDMA network that increases in the 3GPP R5 stage on the existing packet domain, adopt the bearer path of packet domain for its upper strata control signaling and media delivery, and introduce Session Initiation Protocol as professional control protocol, utilize simple, the easy expansion of SIP, media combination characteristics easily, by business control is separated with carrying control, provide abundant multimedia service.Major function entity among the IMS comprise functions such as control user registration, session control conversation control entity CSCF, provide miscellaneous service logic control function application server AS, manage the home subscriber server HSS of user contracting data concentratedly and be used to realize MGCF/IM-MGW (MGCF) with the circuit switching net interconnecting.The user is by current location agent node P-CSCF access IMS, and session and professional triggering control reach with the business control of AS and then finished by the home domain service node S-CSCF of its registered place alternately.

The IMS framework of 3GPP standard definition has solved the roam charge that the required solution of multimedia service is provided under the IP carrying comprehensively, QoS (service quality), but the problems of operation that safety guarantee etc. are crucial, its framework and thinking have obtained industry and have generally acknowledged, 3GPP2, TISPAN has all carried out the definition of corresponding IP multi-media network framework and business system with the 3GPP model as basis and reference, 3GPP has also begun to insert and UMTS intercommunication such as I-WLAN (Interworking of WLAN at WLAN (WLAN (wireless local area network)), the WLAN intercommunication), fixed broadband inserts IMS such as FBI (Fixed Broadband access to IMS, fixed broadband inserts IMS) and towards the all-IP net such as the AIPN subject studies such as (All-IP Network complete IP networks) of multiple access technology, the user can signatory insert IMS by single multimode terminal or polytype different terminals via the Access Network of different access technologies according to it, with what obtain to unify, the multimedia service that comprises VoIP (Voice over IP, IP-based voice) business etc.

At present, 3GPP has proposed a kind of calling controlling schemes of static anchor point (IMS control static anchoring) of IMS control, to solve in two territories, as the problem of switching between CS territory and the IMS territory.The core concept of this scheme is, distribute one to have (CallContinuity Control Function at the IMS home domain for the user as CCCF, the call continuity controlled function) AS (Application Server, application server), for from the CS territory or the IMS territory initiate all will be sent to this AS with this user-dependent call/session and carry out grappling control (Anchoring control).Like this, follow-uply no matter take place between CS territory to the territory in IMS territory to switch or the IMS territory takes place switches between the territory in CS territory, all the call/session of grappling is carried out follow-up switching controls and handle by this AS.

Just can in call path, insert an anchor point AS very easily for session control mode among the IMS itself session is controlled, promptly make session be toggled to AS by definition iFC (initial Filter Criteria, initial filter standard or norm).

And in call path, insert an anchor point AS not too easily for the calling control mode in CS territory itself, and therefore, the calling of initiating at the CS territory is toggled to the process of anchor point AS, and the 3GPP standard has been described multiple implementation at present, wherein:

The initial call of initiating when being the CS territory for Calling Side, promptly for Calling Side VMSC (VisitedMobile Switch Center, Visited Mobile Switching Center) receiving the calling of initiating behind the call setup message of UE, can route the call to anchor point AS by control of network side route and the control of end side route.The control of network side route, promptly use CAMEL (mobile network strengthens the logical client application) scheme to route the call to anchor point AS, the control of end side route, promptly use USSD (Unstructured SupplementaryService Data unstructured supplementary data traffic) and SIP Notify (Session Initial ProtocolNotify, " notice " operation of session initiation protocol) and Prefix (prefix) scheme to route the call to anchor point AS.

The initial call of initiating when being the CS territory for callee side, the GMSC that is called home network is after receiving the calling that comes from Calling Side, according to the calling that GMSC initiates after to the called party information analysis, can use CAMEL scheme, signaling catching scheme, static routing scheme to route the call to anchor point AS based on the NeDS scheme of HSS.

Adopt the control procedure of the cross-domain switching of VCC (phone service continuity) user that static anchor point scheme finishes to be described below in conjunction with 1 pair in accompanying drawing.

Among Fig. 1, when calling is initially set up, as the calling of UE (A) initiation at UE (B), then this calling is inserted an anchor point AS by gsmSCF or the AS with NeDS function in the call path of Calling Side UE (A), and this AS enables B2BUA (back-to-back user agent) function and is divided into AS in order to the calling with Calling Side and stops section and AS and initiate sections two sections.AS termination section is the call leg between UE (A)-AS, and AS initiation section is the call leg between the AS-UE (B).

In follow-up calling procedure, UE (A ') detect when switching condition satisfies between the territory, wish that will the current calling of carrying out switching to UE (A ') from UE (A) carries out follow-up calling and control, at this moment, UE (A ') carry out new calling of AS initiation that grappling is controlled at current calling, AS is after receiving this calling, judge in the time of to carry out switching between the territory, then AS initiates the new calling of initiating of UE (A ') and AS section to continue, discharge the calling of AS termination section then, like this, under the control of anchor point AS, make continuing that UE (A ') and same UE (B) carried out calling out to discharge the call leg between previous UE (A)-AS, finished UE (A) to the switching between the UE (A ').

Above-mentionedly this grappling control is carried out in calling, and the function of carrying out hand-off process between the territory when switch taking place is called CCCF (Call continuity Control Function, the call continuity controlled function) function, under static anchor point scheme, the entity with CCCF function is an AS in the IMS territory.

The UE here (A) can be the terminal in CS territory, and UE (A ') can be the terminal in IMS territory, switches to the calling of UE (A ') by UE (A), the same calling that has realized user A from the CS territory to the call continuity the IMS territory.

Above-mentionedly the function route to anchor point AS is called out in initial CS territory be called CS-NeDS (Network DomainSelection, selection function between the territory) function.The entity that has the NeDS function in the CS territory can be gsmSCF, or is HSS, or is VCC-SRF; In addition, when the calling of callee side has been anchored on the IMS territory, function for the selection of follow-up called continued network is called the IMS-NeDS function, requirement can be according to the user at the CS/IMS login state in the VCC problem of 3GPP at present, user's business, subscription data, strategy/preference that operator and user are provided with, and currently whether there is an ongoing calling in certain territory, and " the called continued network routing decision information " such as IP Access Network abilities that inserts IMS, comprehensively judge with the decision called continued network and select, so that better professional impression to be provided, as guaranteeing the higher success rate that is routed to the called subscriber, selection can provide the mode of more high quality or lower rate etc.The entity that has the IMS-NeDS function in the IMS territory can be an AS.Routing decision entity gsmSCF in the CS territory can be arranged in same physical entity with the routing decision entity A S in the IMS territory.

The logic function of CS-NeDS and IMS-NeDS as shown in Figure 2.

Among Fig. 2, dotted line is represented to come from the IMS territory from the calling at callee side, and solid line is represented to come from the CS territory at the calling of callee side.

For " VCC " service contracting user, when its during as the called subscriber, calling will be always be routed to earlier among the AS with CCCF function in its ownership IMS territory to carry out above-mentioned grappling, then, further determine to be routed to the mode of terminal called again according to above-mentioned " called continued network routing decision information " comprehensive judgement as the NeDS IMS Part among Fig. 2 by IMS-NeDS (the called continued network selection function in IMS territory), as judgement is directly to be routed to terminal called in current IMS territory, and still forwarding the CS territory to from current IMS territory is routed to terminal called again.

Calling at callee side comes from the CS territory, when call out routed to the grappling that the AS that has the CCCF function in the IMS territory calls out after, judge calling by IMS-NeDS according to " called continued network routing decision information " and need route to the process that continues in the CS territory as shown in Figure 3.

Among Fig. 3, in step 1, in the CS territory or the calling initiated of PSTN, or the calling at CS territory user of transmitting from the IMS territory, in carrying out called routing procedure, when the MSISDN of the called party information in calling out belonged to the CS territory, calling routed to the called subscriber and belongs to GMSC in the CS territory.

Carry out information interaction to step 2, GMSC with other network elements, based on the CAMEL scheme, or signaling catching scheme, or static routing scheme, or based on the CS-NeDS scheme of HSS, called number in calling out is revised as IMRN (IMS Routeing Number, IMS territory routing number), belongs to and carry out grappling in the IMS territory to realize routing the call to the called subscriber.

Route the call to MGCF in the IMS territory to step 3, GMSC according to IMRN.

Send INVITE to step 4, MGCF to I-CSCF, the called party information Requested-URI in this INVITE is the TEL URI form of called IMRN.

Inquire about routing iinformation according to the Requested-URI in the INVITE to HSS to step 5, I-CSCF, obtain the S-CSCF address information of this IMRN correspondence in the IMS territory.

Will talk about the S-CSCF that routes to the IMRN correspondence, i.e. S-CSCF1 to step 6, I-CSCF according to the route information query result.

Session is triggered among the AS with CCCF function according to iFC (initial Filter Criteria initial filter standard or norm) to step 7, S-CSCF1.

Transmit this INVITE to step 8, S-CSCF1 to AS with CCCF function.

To step 9, AS with CCCF function grappling control is carried out in the session that receives, promptly trigger B2BUA (back-to-back user agent) function, the session that termination is fallen to receive, then, initiate the new session at former called party information, the called party information Requested-URI in this new session has former called User ' the s URI that the AS of CCCF function parses from IMRN.Then, send at former called INVITE to I-CSCF.

Inquire about routing iinformation according to the Requested-URI in the INVITE to HSS to step 10, I-CSCF, obtain the S-CSCF address information that this former called subscriber registers in the IMS territory.

Will talk about the S-CSCF that routes to former called subscriber's correspondence, i.e. S-CSCF2 to step 11, I-CSCF according to Query Result.

Session is triggered among the AS with IMS-NeDS function according to iFC (initial Filter Criteria initial filter standard or norm) to step 12, S-CSCF2.

Transmit INVITE to step 13, S-CSCF2 to AS with IMS-NeDS function.

To step 14, AS with IMS-NeDS function is according to " called continued network routing decision information ", be that the called subscriber is at the CS/IMS login state, user's business, subscription data, strategy/preference that operator and user are provided with, and currently whether there is an ongoing calling in certain territory, and the IP Access Network ability that inserts IMS, this calling of making a strategic decision out need continue from the CS territory to called, then construct CSRN (the CS Routing Number of Tel-URI form based on former called party information, CS territory routing number), and to I-CSCF send INVITE at CSRN.

Is that the CSRN of Tel-URI form sends INVITE to MGCF to step 15, I-CSCF according to the Requested-URI in the INVITE.

Send IAM message to step 16, MGCF to GMSC, the called party information in the IAM message is CSRN.Follow-up GMSC routes the call to callee side and continues.

In above-mentioned flow process, the IMS-NeDS function can be integrated in independent setting the among the AS, is triggered and routes the call to the AS with IMS-NeDS function by S-CSCF with the ISC interface between the AS according to iFC by S-CSCF and carry out follow-up called continued network routing decision.

In addition, the IMS-NeDS function also can concentrate among the same AS together with the CCCF function, promptly in step 8, when the AS with CCCF function receives Requested-URI when being the INVITE of IMRN, calling is carried out after the grappling, and recover former called party information in the calling according to IMRN, then, trigger the IMS-NeDS function, determine the mode of call proceeding by IMS-NeDS according to " called continued network routing decision information " to terminal called, when IMS-NeDS this calling of making a strategic decision out need continue from the CS territory to called,, and send INVITE at CSRN to I-CSCF then based on the CSRN of former called party information structure Tel-URI form.At this moment, need skip

step

9,10,11,12 and 13 among Fig. 3.

In the above-mentioned steps 2, GMSC carries out information interaction with other network elements, and the process that the called number in calling out is revised as IMRN can comprise following several implementation:

1, when GMSC carries out information interaction with gsmSCF, the concrete processing procedure that called number in will calling out based on the CAMEL scheme is revised as IMRN is: need the contract CSI service of CAMEL of VCC user, at GMSC when HSS obtains roaming number, obtain T-CSI information, GMSC triggers the CAMEL business according to T-CSI then, send IDP to gsmSCF, issue CONNECT by gsmSCF called number is revised as IMRN, follow-up GMSC routes to the IMS territory according to IMRN.

2, when GMSC carries out information interaction with VCC-SRF, the concrete processing procedure that called number in will calling out based on the signaling catching scheme is revised as IMRN is: at GMSC when HLR sends SRI message and obtains roaming number, this message is by the VCC-SRF intercept process, by VCC-SRF IMRN is returned to GMSC as roaming number, follow-up GMSC routes to the IMS territory according to IMRN.

3, the concrete processing procedure that the called number during GMSC will call out based on the static routing scheme is revised as IMRN is: GMSC directly is modified as IMRN with called number MSISDN, routes to the IMS territory.

4, when GMSC carries out information interaction with the HSS with CS-NeDS function, the concrete processing procedure that called number in will calling out based on the CS-NeDS scheme of HSS is revised as IMRN is: GMSC uses called number MSISDN to obtain roaming number to HSS, HSS with CS-NeDS function returns as roaming number IMRN to GMSC, follow-up GMSC routes to the IMS territory according to IMRN.

From the design of present voice business continuity as can be known, GMSC in network receives the incoming call at the called subscriber from the CS territory, and GMSC is based on the static routing scheme, or based on the CS-NeDS scheme of HSS calling is sent in the IMS territory of this user attaching after an AS with CCCF function carries out grappling control, trigger the IMS-NeDS function, determine the mode of call proceeding by IMS-NeDS according to " called continued network routing decision information " to terminal called, as directly in current IMS territory, being routed to terminal called, after forwarding the CS territory to from current IMS territory for another example, be routed to terminal called again.When calling out when need forward the CS territory to from current IMS territory and being routed to terminal called again, the MGCF of calling meeting from the IMS territory is forwarded to the GMSC in the circuit domain.At this moment, GMSC can not judge this calling and carry out grappling in the IMS territory, and do not need to route to once more the IMS territory, like this, GMSC may be once again based on the static routing scheme, or will call out another route based on the CS-NeDS scheme of HSS and go back to the IMS territory, caused calling out from process CS to the normal anchoring treatment in IMS territory, when getting back to the CS territory from the IMS territory again and continuing, can't be routed to terminal called from CS, feasible calling routes to the route circulation repeatedly in IMS territory again from the CS territory, finally cause the failure of calling out.

Summary of the invention

The objective of the invention is to, a kind of system and method for the realization call business based on phone service continuity is provided, make the network equipment clearly judge this calling and whether in the IMS territory, carried out anchoring treatment by calling out the indication information that directly is routed to terminal called, thereby it is clear and definite to make call proceeding arrive the processing procedure of terminal called, prevent the circulating phenomenon of calling out of route repeatedly, realized improving the purpose of call successful rate.

For achieving the above object, the system of a kind of realization call business based on phone service continuity provided by the invention comprises:

Be arranged at generation indication information module and the connecting module that is arranged in the network equipment in the application server with IMS-NeDS function;

Generation indication information module in the described application server is used for: be forwarded to the CS territory from the IMS territory when being routed to terminal called again determine calling out needs according to called continued network routing decision information, generation will be called out the indication information that directly is routed to terminal called;

Connecting module in the network equipment is used for: after detecting described indication information, execution will be called out the handling process that directly is routed to terminal called.

Described connecting module is: the GMSC functional module that is arranged in described application server;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, obtain called subscriber's MSISDN, as will calling out the indication information that directly is routed to terminal called, and the call signaling that will carry called subscriber's MSISDN is sent to the GMSC functional module in the application server with called subscriber's MSISDN;

GMSC functional module in the described application server is after the calling that receives the MSISDN that carries the called subscriber, ask called subscriber's roaming number MSRN according to the MSISDN in calling out to HSS, and route the call to the VMSC/VLR of the current registration of called subscriber according to the MSRN that request obtains, send call setup message by VMSC/VLR to the called subscriber, with call proceeding to terminal called.

Described connecting module is arranged in GMSC;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce CSRN based on called subscriber MSISDN, with CSRN as calling out the indication information that directly is routed to terminal called, and transferring to MGCF by the call signaling INVITE that S-CSCF will carry CSRN, the call signaling IAM that will carry CSRN by MGCF transfers to the connecting module of GMSC;

After the called party information of the connecting module of GMSC in the IAM that determines its reception is CSRN, from CSRN, parse called subscriber's MSISDN, ask called subscriber's roaming number MSRN according to MSISDN to HSS, and route the call to the VMSC/VLR of the current registration of called subscriber according to the MSRN that request obtains, send call setup message by VMSC/VLR to the called subscriber, with call proceeding to terminal called.

Described connecting module is arranged in HSS;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce CSRN based on called subscriber MSISDN, with CSRN as calling out the indication information that directly is routed to terminal called, and transferring to MGCF by the INVITE that S-CSCF will carry CSRN, the call signaling IAM that will be carried CSRN by MGCF transfers to GMSC;

GMSC directly sends the SRI that carries CSRN to HSS;

After connecting module among the HSS is judged called party information among the SRI and is CSRN, from CSRN, parse MSISDN, according to the VMSC/VLR of the current registration of this MSISDN addressing called subscriber, and obtain called subscriber's roaming number MSRN from the VMSC/VLR of the current registration of called subscriber;

Connecting module among the HSS is back to GMSC with MSRN;

GMSC routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN;

VMSC/VLR sends call setup message to the called subscriber, with call proceeding to terminal called.

Described connecting module is: the GMSC functional module that is arranged in MGCF;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce CSRN based on called subscriber MSISDN, CSRN as will calling out the indication information that directly is routed to terminal called, and is transferred to GMSC functional module among the MGCF by the call signaling INVITE that S-CSCF will carry CSRN;

After GMSC functional module among the MGCF determines that the called party information of the INVITE of its reception is CSRN, from CSRN, parse MSISDN, and triggering GMSC function, ask called subscriber's roaming number MSRN according to the MSISDN in calling out to HSS, and route the call to the VMSC/VLR of the current registration of called subscriber according to the MSRN that request obtains, send call setup message by VMSC/VLR to the called subscriber, with call proceeding to terminal called.

The method of the realization call business based on phone service continuity provided by the invention comprises:

A, the application server with IMS-NeDS function are forwarded to the CS territory when being routed to terminal called again determining to call out needs according to called continued network routing decision information from the IMS territory, generation will be called out the indication information that directly is routed to terminal called;

The network equipment in b, the system is after detecting described indication information, and execution will be called out the handling process that directly is routed to terminal called.

Described step b comprises:

The network equipment in the system obtains called subscriber's MSISDN after detecting described indication information, and asks called subscriber's roaming number MSRN according to MSISDN to HSS;

The MSRN that the described network equipment obtains according to request routes the call to the VMSC/VLR of the current registration of called subscriber;

The described network equipment is: the integrated application server of GMSC function, and will call out the indication information that directly is routed to terminal called and be: the MSISDN that is carried at the called subscriber in the called party information of the call signaling that integrated GMSC function sends;

Described step a comprises:

Application server with IMS-NeDS function need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, producing called party information is the call signaling of called subscriber's MSISDN, and send described call signaling to self GMSC function, to trigger the GMSC function of himself.

Described step b comprises:

Called party information in the call signaling that GMSC function in the described application server receives according to AS obtains called subscriber's MSISDN, and sends the SRI that carries MSSIDN to HSS;

HSS is according to the VMSC/VLR of the current registration of MSISDN addressing called subscriber among the SRI, and obtains called subscriber's roaming number MSRN from the VMSC/VLR of the current registration of called subscriber;

HSS is back to MSRN the AS with GMSC function;

AS with GMSC function routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN;

The described indication information that directly is routed to terminal called of will calling out is: based on the CSRN of called subscriber MSISDN formation, and described step a comprises:

Application server with IMS-NeDS function need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce CSRN based on called subscriber MSISDN, and to send called party information to S-CSCF be the call signaling of CSRN, the call signaling that will be carried CSRN by S-CSCF transfers to MGCF, and the call signaling IAM that will be carried CSRN by MGCF transfers to GMSC.

The described network equipment is GMSC, and described step b comprises:

After the called party information of GMSC in the IAM that determines its reception is CSRN, from CSRN, parse called subscriber's MSISDN, and send the SRI that carries MSISDN to HSS;

HSS is back to GMSC with MSRN;

The described network equipment is HSS, and described step b comprises:

GMSC sends the SRI that carries CSRN to HSS;

After the called party information of HSS in determining SRI is CSRN, from CSRN, parse MSISDN, and according to the VMSC/VLR of the current registration of this MSISDN addressing called subscriber, and obtain called subscriber's roaming number MSRN from the VMSC/VLR of the current registration of called subscriber;

HSS is back to GMSC with MSRN;

Described connecting module is: integrated GMSC functional module among the MGCF, and will call out the indication information that directly is routed to terminal called and be: the CSRN that constitutes based on called subscriber MSISDN;

Described step a comprises:

Application server with IMS-NeDS function need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce CSRN based on called subscriber MSISDN, and to send called party information to S-CSCF be the call signaling of CSRN, and the call signaling that will be carried CSRN by S-CSCF transfers to MGCF.

Described step b comprises:

After the called party information of MGCF in determining the call signaling of its reception is CSRN, from CSRN, parse MSISDN, and trigger the GMSC function of himself integrated setting, MSISDN is sent to HSS by SRI;

HSS is back to MSRN the MGCF with GMSC function;

MGCF with GMSC function routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN, sends call setup message by VMSC/VLR to the called subscriber, with call proceeding to terminal called.

Application server with IMS-NeDS function is forwarded to the CS territory when being routed to terminal called again determining to call out needs according to called continued network routing decision information from the IMS territory, producing called party information is the call signaling of called subscriber's MSISDN, and send described call signaling to self GMSC function, to trigger himself integrated GMSC function;

Described GMSC function is by obtaining called subscriber's roaming number MSRN alternately with HSS;

The GMSC function is routed to terminal called route the call to the VMSC/VLR of the current registration of called subscriber according to described MSRN after.

Application server with IMS-NeDS function is forwarded to the CS territory when being routed to terminal called again determining to call out needs according to called continued network routing decision information from the IMS territory, produce CSRN based on called subscriber MSISDN, and to send called party information to S-CSCF be the call signaling of CSRN;

The INVITE that S-CSCF will carry CSRN transfers to MGCF, and the call signaling IAM that will be carried CSRN by MGCF transfers to GMSC;

When the called party information of GMSC in determining IAM is CSRN, parses called subscriber's MSISDN according to the constituted mode of CSRN, and carry out and to call out the handling process that directly is routed to terminal called.

GMSC sends the SRI that carries CSRN to HSS;

HSS is after called party information is CSRN in determining SRI, parses called subscriber's MSISDN according to the constituted mode of CSRN, and returns called subscriber's roaming number MSRN to GMSC;

GMSC is routed to terminal called route the call to the VMSC/VLR of the current registration of called subscriber according to MSRN after.

Application server with IMS-NeDS function is forwarded to the CS territory when being routed to terminal called again determining to call out needs according to called continued network routing decision information from the IMS territory, produce CSRN based on called subscriber MSISDN, and to send called party information to S-CSCF be the call signaling of CSRN, and the INVITE that will be carried CSRN by S-CSCF transfers to the MGCF with GMSC function;

When the called party information of MGCF in determining the INVITE of its reception is CSRN, parse called subscriber's MSISDN according to the constituted mode of CSRN, producing called party information is the call signaling of called subscriber's MSISDN, and send described call signaling to self GMSC function, to trigger himself integrated GMSC function;

Described GMSC function is by obtaining called subscriber's roaming number MSRN alternately with HSS, and is routed to terminal called route the call to the VMSC/VLR of the current registration of called subscriber according to described MSRN after.

Description by technique scheme as can be known, the present invention need be forwarded to the CS territory from the IMS territory when being routed to terminal called again by making application server with IMS-NeDS function determining calling, generation will be called out the indication information that directly is routed to terminal called, make the network equipment clearly judge this calling and whether in the IMS territory, carried out anchoring treatment according to calling out the indication information directly be routed to terminal called, it is clear and definite to make call proceeding arrive the processing procedure of terminal called, has prevented the circulating phenomenon of calling out of route repeatedly; The invention provides the circulating phenomenon of route repeatedly that methods for preventing is called out, as by integrated GMSC function in application server, carry out by the GMSC among the AS and will call out the handling process that directly is routed to terminal called with IMS-NeDS function; For another example by making application server produce CSRN with predetermined prefix with IMS-NeDS function, make multiple network equipment in the system all can clearly judge this calling and whether in the IMS territory, carried out anchoring treatment, and the present invention triggers the network equipment that will call out the handling process that directly is routed to terminal called and can be provided with flexibly according to concrete network demand; Thereby realized improving the purpose of call successful rate by technical scheme provided by the invention.

Description of drawings

Fig. 1 is the control procedure schematic diagram that adopts the cross-domain switching of VCC user that static anchor point scheme finishes;

Fig. 2 is the logic function schematic diagram of CS-NeDS and IMS-NeDS;

Fig. 3 is that IMS-NeDS of the prior art judges the flow chart that calling need route to the CS territory and continue;

Fig. 4 is that the IMS-NeDS of the embodiment of the invention judges the flow chart one that calling need route to the CS territory and continue;

Fig. 5 is that the IMS-NeDS of the embodiment of the invention judges the flowchart 2 that calling need route to the CS territory and continue;

Fig. 6 is that the IMS-NeDS of the embodiment of the invention judges the flow chart 3 that calling need route to the CS territory and continue.

Embodiment

In the static anchor point scheme of continuity service of voice service, the present invention proposes a kind of system and method that prevents the route circulation, in technical scheme of the present invention, for the incoming call that comes from the CS territory at the called subscriber, by making application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling with IMS-NeDS function, generation will be called out the indication information that directly is routed to terminal called, make the network equipment in the system can identify calling and whether in the IMS territory, carried out grappling control, make the network equipment directly proceed to called terminal processes to the calling of having carried out grappling control, as when the network equipment in the said system is GSMC, if then GMSC does not receive the indication information that directly is routed to terminal called with calling out, then determine to call out and in the IMS territory, to carry out grappling control, at this moment, GMSC can route the call to the AS with CCCF function in the IMS territory, to carry out grappling control; If GMSC receives the indication information that directly is routed to terminal called with calling out, then determine to call out in the IMS territory, to have carried out grappling control, at this moment, GMSC directly routes the call to callee side and continues.As can be seen, technical scheme provided by the invention is effectively avoided the route circulating phenomenon called out from foregoing description, thereby the calling of having avoided causing owing to the route circulating phenomenon can't normally be routed to called subscriber's phenomenon.

The system of the realization call business based on phone service continuity provided by the invention mainly comprises: be arranged at the generation indication information module in the application server with IMS-NeDS function and be arranged at connecting module in the network equipment.

Have generation indication information module in the IMS-NeDS function application server and be mainly used in definite calling and need be forwarded to the CS territory from the IMS territory when being routed to terminal called again, generation will be called out the indication information that directly is routed to terminal called.Having generation indication information module among the AS of IMS-NeDS function in the IMS territory can judge calling according to " called continued network routing decision information " and whether need to forward the CS territory to from current IMS territory and be routed to terminal called again, when determining calling and need forward the CS territory to from current IMS territory and be routed to terminal called again, AS with IMS-NeDS function can produce and will call out the indication information that directly is routed to terminal called, then, connecting module in the network equipment sends the calling that carries this indication information, indication information can embody by the called party information in the call signaling, as is set to called party information of CSRN etc.Here " called continued network routing decision information " can for: the called subscriber is at the CS/IMS login state, user's business, subscription data, strategy/preference that operator and user are provided with, currently whether there is an ongoing calling in certain territory, and the IP Access Network ability etc. that inserts IMS.

Connecting module in the network equipment is mainly used in: for the calling that receives, comprise in the called party information in detecting calling that application server with IMS-NeDS function produces will call out the indication information that directly is routed to terminal called after, execution will be called out the handling process that directly is routed to terminal called.The handling process that directly is routed to terminal called of will calling out that connecting module is carried out mainly comprises following process:

Connecting module detect that AS with IMS-NeDS function produces will call out the indication information that directly is routed to terminal called after, obtain called subscriber's MSISDN, and MSISDN is sent to HSS by SRI, HSS is addressed to the VMSC/VLR of the current registration of called subscriber according to the MSISDN among the SRI, and obtain called subscriber's roaming number MSRN from the VMSC/VLR of the current registration of called subscriber, HSS is back to connecting module in the network equipment with MSRN, connecting module in the network equipment routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN, VMSC/VLR sends call setup message to the called subscriber, calls out and is continued to terminal called.

Connecting module can be arranged in the different network equipment of system, when connecting module is positioned at the different network equipments, has and cooperate between the AS of IMS-NeDS function and the connecting module that to realize calling out the concrete handling process that directly is routed to terminal called incomplete same.Be example with several concrete situations below, system of the present invention is described in detail.

Example 1, connecting module are arranged in the application server with IMS-NeDS function, and promptly connecting module is to have GMSC functional module integrated in the application server of IMS-NeDS function.

After having generation indication information module among the AS of IMS-NeDS function in the IMS territory and can determining calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", then produce and will call out the indication information that directly is routed to terminal called, this indication information can be the called party information based on called subscriber's MSISDN.After producing above-mentioned indication information, produce the connecting module of indication information module to the integrated setting of the AS with IMS-NeDS function self, be that the GMSC functional module sends call signaling such as the INVITE of called party information for called subscriber's MSISDN, to trigger the GMSC functional module of himself integrated setting.

After the GMSC functional module that has integrated setting among the AS of IMS-NeDS function in the IMS territory receives the call signaling that carries called subscriber MSISDN, according to the called party information MSISDN in the call signaling, send MAP message Send Routeing Info (SRI) operation to HSS, wherein, carry MSISDN among the SRI.

HSS receives SRI, and be addressed to the VMSC/VLR of the current registration of called subscriber according to the MSISDN among the SRI, HSS sends Provide Roaming Number (PRN) operation to VLR then, roaming number MSRN with the request called subscriber, VLR distributes roaming number MSRN for the called subscriber, and called subscriber's roaming number MSRN is back to HSS.HSS is back to MSRN the GMSC functional module among the AS that has the IMS-NeDS function in the IMS territory.This GMSC functional module routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN, after the calling that the GMSC functional module route of VMSC/VLR in receiving AS come, send call setup message to the called subscriber, at this moment, call proceeding is to terminal called.

Example 2, connecting module are arranged in GMSC.

After the AS that has the IMS-NeDS function in the IMS territory can determine calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", then produce and to call out the indication information that directly is routed to terminal called, promptly produce CSRN with predetermined prefix based on called subscriber MSISDN, then, AS with IMS-NeDS function is the call signaling of CSRN to S-CSCF transmission called party information, at this moment, called party information in the call signaling can be the form of " predetermined prefix+MSISDN ", also can be alternate manner, as the CSRN that generates based on pre-defined algorithm etc.The predetermined prefix here is a special prefix.The INVITE that AS will carry CSRN transfers to S-CSCF, the INVITE that S-CSCF will carry CSRN transfers to MGCF, obtain CSRN in the called party information of MGCF from INVITE, and CSRN is transferred to the connecting module that is arranged in GMSC by call signaling IAM.The constituted mode of the called number of the connecting module among the GMSC in determining call signaling IAM message is when having the CSRN of special prefix, judge this calling and in the IMS territory, carried out anchoring treatment, at this moment, connecting module among the GMSC parses MSISDN according to the constituted mode of CSRN, then, send the SRI operation to HSS, wherein, carry MSISDN among the SRI.After HSS receives the SRI of GMSC transmission, be addressed to the VMSC/VLR of the current registration of called subscriber according to the MSISDN among the SRI, HSS sends PRN to VLR, roaming number MSRN with the request called subscriber, VLR distributes roaming number MSRN for the called subscriber, and called subscriber's roaming number MSRN is back to HSS.The connecting module of HSS in GMSC returns roaming number MSRN.Connecting module among the GMSC routes the call to VMSC/VLR according to MSRN, and VMSC sends call setup message to the called subscriber, and call proceeding is to terminal called.

Example 3, connecting module are arranged in HSS.

After the AS that has the IMS-NeDS function in the IMS territory can determine calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", what then produce will call out the indication information that directly is routed to terminal called, as produce CSRN based on called subscriber MSISDN with predetermined prefix, at this moment, called party information in the calling is the form of " predetermined prefix+MSISDN ", and the predetermined prefix here is a special prefix.Certainly, above-mentioned indication information information also can be alternate manner, as the CSRN that generates based on pre-defined algorithm etc.The INVITE that AS will carry CSRN transfers to S-CSCF, and the INVITE that S-CSCF will carry CSRN transfers to MGCF, obtains CSRN in the called party information of MGCF from INVITE, and CSRN is transferred to GMSC by call signaling IAM.

GMSC is sent to the SRI that carries CSRN the connecting module that is arranged in HSS after receiving the call signaling IAM that carries CSRN.After connecting module among the HSS is determined called party information among the SRI and is CSRN according to special prefix, from CSRN, parse MSISDN, connecting module among the HSS is addressed to the VMSC/VLR of the current registration of called subscriber according to MSISDN, HSS sends PRN to VLR, roaming number MSRN with the request called subscriber, VLR distributes roaming number MSRN for the called subscriber, and called subscriber's roaming number MSRN is back to connecting module among the HSS.Connecting module among the HSS returns roaming number MSRN to GMSC.GMSC routes the call to VMSC/VLR according to MSRN, and VMSC sends call setup message to the called subscriber, and call proceeding is to terminal called.

Example 4, connecting module are arranged in the MGCF that is integrated with the GMSC functional module, and promptly connecting module is a GMSC functional module integrated among the MGCF.

After the AS that has the IMS-NeDS function in the MS territory can determine calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", what then produce will call out the indication information that directly is routed to terminal called, promptly produce the CSRN with predetermined prefix based on called subscriber MSISDN.The predetermined prefix here is a special prefix.The INVITE that AS will carry CSRN transfers to S-CSCF, and at this moment, the called party information in the INVITE is the form of " predetermined prefix+MSISDN ".Certainly, the called party information in the above-mentioned INVITE also can be alternate manner, as the CSRN that generates based on pre-defined algorithm etc.The INVITE that S-CSCF will carry CSRN transfers to MGCF, MGCF determines called party information in the INVITE of its reception and is CSRN according to the prefix special prefix in the called party information in the INVITE of its reception after, from CSRN, parse MSISDN, and triggering connecting module function, promptly trigger the GMSC function that is integrated in himself, send MAP message SRI operation to HSS, wherein, carry MSISDN among the SRI.After HSS receives the SRI of the MGCF transmission that is integrated with the GMSC function, be addressed to the VMSC/VLR of the current registration of called subscriber according to the MSISDN among the SRI, HSS sends PRN to VLR, roaming number MSRN with the request called subscriber, VLR distributes roaming number MSRN for the called subscriber, and called subscriber's roaming number MSRN is back to HSS.The connecting module of HSS in MGCF returns roaming number MSRN.GMSC functional module among the MGCF routes the call to the VMSC/VLR of the current registration of called subscriber according to MSRN, and VMSC sends call setup message to the called subscriber, and call proceeding is to terminal called.

Be example with several situations about having below, in conjunction with the accompanying drawings method provided by the invention be described.

Method one: the roaming number in the direct acquisition cuicuit of the AS in IMS territory territory.

In the method one, has the integrated GMSC function that realizes circuit domain that is provided with among the AS of IMS-NeDS function, at this moment, when the AS that has the IMS-NeDS function in the IMS territory determines calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", connecting module to self integrated setting, be that the GMSC functional module sends the call signaling of called party information for called subscriber's MSISDN, to trigger the GMSC function of himself integrated setting, after the GMSC functional module receives the call signaling that carries called subscriber MSISDN, send SRI according to the called party information MSISDN in the call signaling to HSS, wherein, carry MSISDN among the SRI, HSS sends PRN according to MSISDN to VMSC/VLR, obtain called subscriber's MSRN, in follow-up implementation procedure, each network entity will be called out according to MSRN and route to callee side via VMSC and continue.

Concrete realization flow as shown in Figure 4.

Step 1 among Fig. 4 is to step 13, and is identical to step 13 with step 1 among Fig. 3, specifically can no longer be repeated in this description at this referring to the description in the background technology.

To step 14, have an IMS-NeDS function AS according to " called continued network routing decision information ", be that the called subscriber is at the CS/IMS login state, user's business, subscription data, strategy/preference that operator and user are provided with, and currently whether there is an ongoing calling in certain territory, and the IP Access Network ability that inserts IMS, this calling of making a strategic decision out need continue from the CS territory when called, generation will be called out the indication information that directly is routed to terminal called, and this indication information can be the called party information based on called subscriber's MSISDN.After producing above-mentioned indication information, the AS with IMS-NeDS function is to the connecting module of self integrated setting, and promptly to send called party information be the call signaling of called subscriber's MSISDN to the GMSC functional module, to trigger the GMSC function of himself integrated setting.After the GMSC functional module that has integrated setting among the AS of IMS-NeDS function in the IMS territory receives the call signaling that carries called subscriber MSISDN, according to the called party information MSISDN in the call signaling, send MAP message Send Routeing Info (SRI) operation to HSS, wherein, carry MSISDN among the SRI.

After receiving the SRI that AS with GMSC function sends to step 15, HSS, be addressed to the VMSC/VLR of the current registration of user according to the MSISDN among the SRI, send PRN to VLR, VLR distributes roaming number MSRN and returns to HSS.

Return roaming number MSRN to step 16, HSS to AS with GMSC function.

Route the call to VMSC/VLR to step 17, AS with GMSC function according to MSRN.

Send call setup message to step 18, VMSC to the called subscriber, call proceeding is to terminal called.

In step 14, AS with GMSC function is except the function that sends routing information that realizes circuit domain GMSC, can also realize other function of circuit domain GMSC, as trigger called subscriber CAMEL business, realize called subscriber's Call Forwarding Unconditional business etc., with avoid calling out directly get from the IMS territory roaming number call out be routed to directly that terminal called causes can't circuits for triggering territory called service, lost the traffic performance of circuit domain.Its concrete implementation procedure is consistent with the processing of existing GMSC.

Method two: constitute according to special number, come call identifying whether in the IMS territory, to carry out anchoring treatment.

Called number in the mode of GMSC employing static routing directly will be called out is modified as IMRN to realize that routing the call to the called subscriber belongs under the situation of carrying out grappling in the IMS territory, and the present invention can come call identifying whether to carry out grappling by the constituted mode of judging CSRN in GMSC in the IMS territory.

When the AS with IMS-NeDS function need continue from the CS territory when called according to " called continued network routing decision information " this calling of making a strategic decision out, AS with IMS-NeDS function is based on former called party information structure CSRN, here the constituted mode of CSRN is " special prefix+former called party information ", when GMSC receives the call signaling of MGCF forwarding, special prefix according to the called number front, it is CSRN that GMSC can identify this called number, like this, GMSC can judge this calling and carry out anchoring treatment in the IMS territory, at this moment, GMSC can not carry out the operation of step 2 among Fig. 3, be that called number during GMSC will not call out is revised as IMRN, but parse MSISDN according to the constituted mode of CSRN, then, send SRI to HSS, HSS sends PRN according to MSISDN to VMSC/VLR, obtain called subscriber's MSRN, in follow-up implementation procedure, each network entity will be called out according to MSRN and route to callee side via VMSC and continue.

Concrete realization flow as shown in Figure 5.

Step 1 among Fig. 5 is to step 16, and is identical to step 16 with step 1 among Fig. 3, specifically can no longer be repeated in this description at this referring to the description in the background technology.

Is CSRN to step 17, GMSC according to the constituted mode of the called number in the call signaling IAM message, judging this calling judges carried out anchoring treatment in the IMS territory, this moment, GMSC parsed MSISDN according to the constituted mode of CSRN, trigger then then and send SRI, comprise MSISDN among the SRI to HSS.

After receiving the SRI that GMSC sends to step 18, HSS, be addressed to the VMSC/VLR of the current registration of user according to the MSISDN among the SRI, send PRN to VLR, VLR distributes roaming number MSRN and returns to HSS.

Return roaming number MSRN to step 19, HSS to GMSC.

Route the call to VMSC/VLR to step 20, GMSC according to MSRN

Send call setup message to step 21, VMSC to the called subscriber, call proceeding is to terminal called.

Route the call to the called subscriber with realization and belong to when carrying out grappling in the IMS territory when adopting called number in calling out based on the CS-NeDS scheme of HSS to be modified as IMRN, method two can come call identifying whether to carry out grappling by the constituted mode of judging CSRN in HSS in the IMS territory, promptly when GMSC receives the incoming call of MGCF forwarding, send SRI according to the called number CSRN in the call signaling to HSS, comprise MSISDN among the SRI, HSS is after receiving SRI, special prefix according to the called number front, it is CSRN that HSS can identify this called number, then can judge this calling and in the IMS territory, carry out anchoring treatment, then the constituted mode according to CSRN parses MSISDN, send PRN according to MSISDN to VMSC/VL, obtain called subscriber's MSRN, return MSRN to GMSC then, follow-up GMSC will call out according to MSRN and route to callee side via VMSC and continue.

Method three: the roaming number in the direct acquisition cuicuit of the MGCF in IMS territory territory.

Among the MGCF in the IMS territory under the situation of the GMSC function of integrated realization circuit domain, when the AS that has the IMS-NeDS function in the IMS territory determines calling and need forward the CS territory to from current IMS territory and be routed to terminal called again according to " called continued network routing decision information ", then construct the CSRN of Tel-URI form based on former called party information, here the constituted mode of CSRN is " special prefix+former called party information ", and to the INVITE of I-CSCF transmission at CSRN.I-CSCF is that the CSRN of Tel-URI form sends INVITE to MGCF according to the Requested-URI in the INVITE, when MGCF receives the INVITE of I-CSCF forwarding, constituted mode according to Requested-URI is CSRN for " special prefix+former called party information " identifies this called number, then can judge this calling and in the IMS territory, carry out anchoring treatment, at this moment, MGCF triggers the GMSC function from self integrated setting, constituted mode according to CSRN parses MSISDN, then, send SRI to HSS, HSS sends PRN according to MSISDN to VMSC/VL, obtain called subscriber's MSRN, follow-up will the calling according to MSRN routes to callee side via VMSC and continues.

Concrete realization flow as shown in Figure 6.

Step 1 among Fig. 6 is to step 15, and is identical to step 15 with step 1 among Fig. 6, specifically can no longer be repeated in this description at this referring to the description in the background technology.。

To the constituted mode of step 16, the Requested-URI of MGCF in determining its INVITE that receives during for " special prefix+former called party information ", identifying this called number is CSRN, thereby judge this calling and in the IMS territory, carried out anchoring treatment, at this moment, MGCF triggers the GMSC function of himself integrated setting, promptly the constituted mode according to CSRN parses MSISDN, sends SRI to HSS then.

After receiving the SRI that MGCF with GMSC function sends to step 17, HSS, be addressed to the VMSC/VLR of the current registration of user according to the MSISDN among the SRI, send PRN to VL, VLR distributes roaming number MSRN and returns to HSS.

Return roaming number MSRN to step 18, HSS to MGCF with GMSC function.

Route the call to VMSC/VLR to step 19, MGCF with GMSC function according to MSRN.

Send call setup message to step 20, VMSC to the called subscriber, call proceeding is to terminal called.

In step 16, have among the MGCF of GMSC function except the function that sends routing information that realizes circuit domain GMSC, can also realize other function of circuit domain GMSC, as trigger called subscriber CAMEL business, realize called subscriber's Call Forwarding Unconditional business etc., with avoid calling out directly get from the IMS territory roaming number call out be routed to directly that terminal called causes can't circuits for triggering territory called service, lost the traffic performance of circuit domain.Its concrete implementation procedure is consistent with the processing of existing GMSC.

In the description of the foregoing description, when indication information is not when having the CSRN of predetermined prefix, as long as it is CSRN that connecting module can identify called party information, can determine calling and in the IMS territory, carry out anchoring treatment, its specific implementation process is not described in detail at this.

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, and the claim of application documents of the present invention comprises these distortion and variation.

Claims

1, a kind of system of the realization call business based on phone service continuity, it is characterized in that described system comprises: be arranged at generation indication information module and the connecting module that is arranged in the network equipment in the application server with selection function IMS-NeDS function between IP Multimedia System-territory;

Generation indication information module in the described application server is used for: be forwarded to the circuit switching (CS) territory from IP Multimedia System IMS territory when being routed to terminal called again determine calling out needs according to called continued network routing decision information, generation will be called out the indication information that directly is routed to terminal called;

2, the system of a kind of realization call business based on phone service continuity as claimed in claim 1, it is characterized in that, the described network equipment is: described application server, and connecting module is: the gateway MSC GMSC functional module that is arranged in described application server;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, obtain called subscriber's the international comprehensive service digital net number MSISDN of travelling carriage, as will calling out the indication information that directly is routed to terminal called, and the call signaling that will carry called subscriber's MSISDN is sent to the GMSC functional module in the application server with called subscriber's MSISDN;

GMSC functional module in the described application server is after the calling that receives the MSISDN that carries the called subscriber, ask called subscriber's roaming number MSRN according to the MSISDN in calling out to HSS, and route the call to the Visited Mobile Switching Center/VLR Visitor Location Register VMSC/VLR of the current registration of called subscriber according to the MSRN that request obtains, send call setup message by VMSC/VLR to the called subscriber, with call proceeding to terminal called.

3, the system of a kind of realization call business based on phone service continuity as claimed in claim 1 is characterized in that the described network equipment is: GMSC;

Generation indication information module in the described application server need be forwarded to the CS territory from the IMS territory when being routed to terminal called again in definite calling, produce circuit commutative field routing number CSRN based on called subscriber MSISDN, with CSRN as calling out the indication information that directly is routed to terminal called, and inviting INVITE to transfer to media network controlled function entity MGCF by the call signaling that service call session control function entity S-CSCF will carry CSRN, the call signaling initial address message IAM that will carry CSRN by MGCF transfers to the connecting module of GMSC;

4, the system of a kind of realization call business based on phone service continuity as claimed in claim 1 is characterized in that the described network equipment is: home subscriber server HSS;

GMSC directly sends the transmission routing iinformation SRI that carries CSRN to HSS;

Connecting module among the HSS is back to GMSC with MSRN;

5, the system of a kind of realization call business based on phone service continuity as claimed in claim 1 is characterized in that the described network equipment is: MGCF, and described connecting module is: the GMSC functional module that is arranged in MGCF;

6, a kind of method of the realization call business based on phone service continuity is characterized in that, comprising:

7, the method for a kind of realization call business based on phone service continuity as claimed in claim 6 is characterized in that described step b comprises:

8, as the method for claim 6 or 7 described a kind of realization call business based on phone service continuity, it is characterized in that, the described network equipment is: the integrated application server AS of GMSC function, and will call out the indication information that directly is routed to terminal called and be: the MSISDN that is carried at the called subscriber in the called party information of the call signaling that integrated GMSC function sends;

Described step a comprises:

9, the method for a kind of realization call business based on phone service continuity as claimed in claim 8 is characterized in that described step b comprises:

HSS is back to MSRN the AS with GMSC function;

10, as the method for claim 6 or 7 described a kind of realization call business based on phone service continuity, it is characterized in that, the described indication information that directly is routed to terminal called of will calling out is: based on the CSRN of called subscriber MSISDN formation, and described step a comprises:

11, the method for a kind of realization call business based on phone service continuity as claimed in claim 10 is characterized in that the described network equipment is GMSC, and described step b comprises:

HSS is back to GMSC with MSRN;

12, the method for a kind of realization call business based on phone service continuity as claimed in claim 10 is characterized in that the described network equipment is HSS, and described step b comprises:

GMSC sends the SRI that carries CSRN to HSS;

HSS is back to GMSC with MSRN;

13, as the method for claim 6 or 7 described a kind of realization call business based on phone service continuity, it is characterized in that, the described network equipment is: the integrated MGCF of GMSC function, and will call out the indication information that directly is routed to terminal called and be: the CSRN that constitutes based on called subscriber MSISDN;

Described step a comprises:

14, the method for a kind of realization call business based on phone service continuity as claimed in claim 13 is characterized in that described step b comprises:

HSS is back to MSRN the MGCF with GMSC function;

15, a kind of method of the realization call business based on phone service continuity is characterized in that, comprising:

16, a kind of method of the realization call business based on phone service continuity is characterized in that, comprising:

17, a kind of method of the realization call business based on phone service continuity is characterized in that, comprising:

GMSC sends the SRI that carries CSRN to HSS;

18, a kind of method of the realization call business based on phone service continuity is characterized in that, comprising: