CN101106803A - Method and system for switching between independent networks and keeping call continuity - Google Patents
Method and system for switching between independent networks and keeping call continuity Download PDFInfo
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- CN101106803A CN101106803A CNA2006100993081A CN200610099308A CN101106803A CN 101106803 A CN101106803 A CN 101106803A CN A2006100993081 A CNA2006100993081 A CN A2006100993081A CN 200610099308 A CN200610099308 A CN 200610099308A CN 101106803 A CN101106803 A CN 101106803A
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Abstract
The invention discloses a method for switching between independent networks while maintaining call continuity to solve the problem of the prior arts that a user cannot switch between different domains belonging to independent networks while ensuring call continuity. The method includes that a user terminal which has established a call in an circuit exchange CS domain requests for switching the call into an IMS domain, in which the CS domain and the IMS domain belong to two independent networks respectively; a continuous call control functional CCCF entity in the CS domain connects the call into the IMS domain; a SIP session controlling program of the CCCF entity in the IMS domain establishes an IMS session path between the user terminal and the calling terminal; and the user terminal releases CS call after the IMS session path is established. The invention also discloses a communication system.
Description
Technical field
The present invention relates to the call continuity technology of the communications field, relate in particular to the method and system of between separate network, switching and keep call continuity.
Background technology
3G technology is ripe gradually at present, and much commercialization has been dropped in country, area in the whole world.The proposition of IP Multimedia System (IMS) is for mobile network's multimedia service provides a solution.The network configuration that 3G network adopts carrying and control to be separated is supported ATM, IP, many kinds of bearing modes of TDM.
Network is divided into circuit commutative field, IP multimedia domain, MMD and packet-switched domain.Circuit commutative field adopts circuit-switched technology that voice and multimedia service are provided, with the 2G system class seemingly; Packet-switched domain provides IP connectivity for the user, and the user can insert Internet whereby; The IMS territory adopts session initiation protocol SIP to provide IP-based multimedia service as main communication protocol for the user.
Can predict in the near future a user will inevitably run into the problem how to switch between different territories when using the 3G service, using circuit domain call such as the user, but the signal of circuit domain is more weak at present, and the signal in IMS territory is more intense, at this moment preferably speech channel is switched in the IMS territory, thereby obtain better speech quality.Organize business norms and the demand of actively formulating switching speech continuity control between CS territory and the IMS territory at this problem 3GPP.
At present, in 3GPP voice conversation continuity research topic, propose a kind of static state and anchored to the central controlled handover scheme of IMS, its basic thought is, distribute an application server AS as call continuity controlled function (CCCF) at the IMS home domain for the user, all control signalings that relate to this user's circuit domain call and the session of IMS territory are all delivered to this application server carry out grappling, control in the mode of third party control by CCCF and to switch the user and the conversation between end subscriber is connected, and ask control to finish cross-domain switching-that is to say according to the user, be connected with conversation and be divided into two sections on this application server switching the user end subscriber, when the user need carry out cross-domain switching, rebulid its connection by switching the network domains of user after switching to this application server, set up successfully the back and heavily consult to connection at self, make that to be connected enterprising jargon sound mutual new to end subscriber and switching user end subscriber by this application server controls.As shown in Figure 1, in handoff procedure, be accomplished to the replacement (moving commentaries on classics) of two sections sessions between voice conversation continuity VCC user by the control of CCCF entity.
Executive circuit territory process of setting up of signaling and carrying in the VCC handoff procedure of IMS is in the prior art: at first, the CCCF that the initial call Be Controlled of VCC user's circuit domain is routed to its ownership IMS territory carries out grappling, and the VCC user who sets up through the IM-MGW segmentation connects to CS and two sections carryings of IP to end subscriber.If to end subscriber at the PSTN network, then also will be in to distolateral connection through a MGCF at CCCF.
The user switches to the IMS territory from the CS territory process is: when user's decision switches to IMS, if do not carry out the IMS registration as yet, then at first finish the IMS registration; Send a session foundation of carrying initial session information then and ask CCCF, as switching indication, request CCCF execution calls out the current CS that has set up to the operation that switches to IMS with the total service identification of the CCCF that wherein carries; The current service call conversation control function for user's distribution of network is set up session according to user's filter criteria and is asked to route to CCCF; CCCF carries out SIP session that CS calling leg with the user replaces with the IMS calling leg and moves and turn over journey, and the opposite end between the session section on finish by UPDATE or re-INVITE and to move commentaries on classics, 100～200 milliseconds speech interruption will appear in moving commentaries on classics; Complete successfully the SIP session and move signaling and the carrying that is discharged into VCC user's circuit calling leg correspondence after the commentaries on classics.
The process in the follow-up switchback CS of user territory is: terminal is at first in Visited Mobile Switching Center registration (renewal of circuit domain position) when decision needs VCC to switch back CS, utilize the CCCF public service identity to initiate a circuit domain call subsequently, utilize the CCCF public service identity that wherein carries to carry out the process of switching back CS as switching indication request CCCF to CCCF.This circuit domain call is through MGCF and inquire or service call conversation control function is routed to CCCF.The SIP session that CCCF carries out and top described similar IMS calling leg with the user replaces with the CS calling leg is moved and is turned over journey; Complete successfully the SIP session and move signaling and the carrying that is discharged into VCC user's IMS calling leg correspondence after the commentaries on classics.
In existing scheme, all be at user not switching between the same area in same network, can't belong to not switching between the same area and guaranteeing call continuity of separate two networks respectively.
Summary of the invention
The invention provides a kind of method and system of between separate network, switching and keeping call continuity, can't belong to the problem of not switching and guarantee call continuity between the same area of separate two networks respectively to solve subscriber equipment in the prior art.
The invention provides following technical scheme:
A kind of method of switching and keep call continuity between separate network comprises step:
The user terminal requests of having set up calling in A, the circuit switching (CS) territory switches to the IMS territory with calling, and described CS territory and IMS territory belong to two separate networks respectively;
Continuous call controlled function CCCF entity in B, the described CS territory arrives described IMS territory with call proceeding;
CCCF entity control SIP conversation procedure in C, the described IMS territory is set up the IMS speech channel between the distant terminal of described user terminal and conversation, and described user terminal discharges the CS calling after setting up the IMS speech channel.
Described step B comprises:
GMSC in this CS of CCCF entity requests territory in the described CS territory arrives the IMS territory with call proceeding;
Described GMSC is with the controlled function entity of call proceeding signaling plane in the IMS territory;
The controlled function entity of described signaling plane is triggered to CCCF entity in the IMS territory with calling.
Described method further comprises step:
D, the described user terminal requests of carrying out session in the IMS territory will be called out and be switched go back to described CS territory;
The controlled function entity of signaling plane arrives described CS territory with described call proceeding in E, the IMS territory;
CCCF entity control in F, the described CS territory is arrived described user terminal with call proceeding, and this user terminal discharges the IMS speech channel after setting up the CS speech channel.
Described step e comprises:
The controlled function entity of signaling plane is received GMSC in the described CS territory with calling in the IMS territory;
GMSC obtains CCCF entity in the described CS territory by the inquiry CAMEL-Subscription-Information, and calling is triggered to this CCCF entity.
A kind of method of switching and keep call continuity between separate network comprises the steps:
(1) user terminal requests of having set up session in the IMS territory switches to the circuit switching (CS) territory with calling, and described CS territory and IMS territory belong to two separate networks respectively;
(2) the controlled function entity of signaling plane arrives the CS territory with call proceeding in the IMS territory;
(3) control of the continuous call controlled function CCCF entity in the CS territory is arrived described user terminal with call proceeding, and this user terminal discharges the IMS speech channel after setting up calling.
Step (2) comprising:
GMSC in the IMS territory in the controlled function entity requests CS territory of signaling plane arrives described user terminal with call proceeding;
GMSC obtains CCCF entity in the described CS territory by the inquiry CAMEL-Subscription-Information, and calling is triggered to this CCCF entity.
Described method further comprises step:
(4) the described user terminal requests of having set up calling in the CS territory will be called out and be switched go back to described IMS territory;
(5) the continuous call controlled function CCCF entity in the described CS territory with call proceeding to described IMS territory;
(6) the CCCF entity control SIP conversation procedure in the described IMS territory is set up the IMS speech channel between the distant terminal of described user terminal and conversation, and described user terminal discharges the CS calling after setting up the IMS speech channel.
Step (5) comprising:
GMSC in this CS of CCCF entity requests territory in the described CS territory arrives the IMS territory with call proceeding;
Described GMSC is with the controlled function entity of call proceeding signaling plane in the IMS territory;
The controlled function entity of described signaling plane is triggered to CCCF entity in the IMS territory with calling.
A kind of communication system comprises CS territory and IMS territory, and this CS territory and IMS territory belong to two separate communication networks respectively; Have continuous call controlled function CCCF entity in the described CS territory, have CCCF entity and signaling plane controlled function entity in the described IMS territory; When user's request switches to the IMS territory with the calling of having set up in the CS territory, CCCF entity control in the described CS territory is arrived described IMS territory with call proceeding, CCCF entity control SIP conversation procedure in the IMS territory is set up the IMS speech channel between the user, and the control of the CCCF entity in CS territory related entities discharges the CS call resources after setting up the IMS speech channel; Perhaps, user request will have been set up session when switching to the CS territory in the IMS territory, the controlled function entity of signaling plane arrives the CS territory with call proceeding in the IMS territory, continuous call controlled function CCCF entity control in the CS territory is arrived the user with call proceeding, and the CCCF entity control related entities in setting up IMS territory, calling back, CS territory discharges the IMS call resources.
Employing the invention solves to switch between CS territory in two separate networks of user and IMS territory and keeps the continuous problem of speech, (one is CS when the user uses two separate networks simultaneously with two numbers, one is IMS) when serving, in the time of can guaranteeing to switch between two numbers, conversation can not interrupted.
Description of drawings
Fig. 1 is for being accomplished to the schematic diagram of the cross-domain switching of VCC user by user attaching IMS territory (CCCF) control in the prior art;
Fig. 2 is the networking schematic diagram of two separate networks in the embodiment of the invention;
Fig. 3 A is the main flow chart that the user that set up calling in the embodiment of the invention in the CS territory switches to the IMS territory;
Fig. 3 B is that the user switches to the flow chart that returns the CS territory behind the IMS territory in the embodiment of the invention;
Fig. 4 switches to the signaling process figure in IMS territory from the CS territory for user in the embodiment of the invention;
Fig. 5 turns back to the signaling process figure in CS territory from the IMS territory for user in the embodiment of the invention;
Fig. 6 A is the main flow chart that the user that set up the SIP session in the embodiment of the invention in the IMS territory switches to the CS territory;
Fig. 6 B is the main flow chart that the user is switched go back to the IMS territory in the embodiment of the invention;
Fig. 7 switches to the signaling process figure in CS territory from IMS for user in the embodiment of the invention;
Fig. 8 turns back to the signaling process figure in IMS territory from the CS territory for user in the embodiment of the invention.
Embodiment
Consult system shown in Figure 2, wherein CS territory and IMS territory are separate network, and user terminal UE has two numbers that belong to CS territory and IMS territory respectively, use these two numbers can insert CS territory and IMS territory respectively.In the CS territory, can control SCP and finish continuous call controlled function CCCF by business, in the IMS territory, finish continuous call controlled function CCCF by application server AS, MGCF MGCF/ borde gateway controlled function BGCF is used in CS territory and IMS conversion and transmission signaling as the controlled function entity of signaling plane in the IMS territory.
Consult shown in Fig. 3 A, the main processing procedure that the user who has set up calling in the CS territory switches to the IMS territory is as follows:
The user terminal requests in step 300, circuit switching (CS) territory switches to the IMS territory with calling.
Continuous call controlled function CCCF entity in step 305, the CS territory arrives the IMS territory according to routing configuration with call proceeding.
The controlled function entity of signaling plane sends to the CCCF entity with Call Transfer for the INVITE sip message in step 3 10, the IMS territory, sets up the IMS speech channel by CCCF entity control SIP conversation procedure between the distant terminal of described user terminal and conversation.
Consult shown in Fig. 3 B, after the user switched to the IMS territory, the processing procedure of returning the CS territory was as follows:
The controlled function entity of step 350, user terminal requests signaling plane will be called out and switch go back to the CS territory.
The controlled function entity of step 355, signaling plane is triggered to the CS territory with calling.
Consult Fig. 4 (in conjunction with Fig. 2), two numbers of user's dual-mode terminal are respectively A (IMS territory) and B (CS territory), suppose that the user converses with B number and a landline telephone C, and the concrete signaling process that switches to the IMS territory from the CS territory is as follows with calling out:
Step 400, user terminal (CS) send the MAP:USSD operation, and request CCCF calls out switching.
The CCCF functional entity in step 410, CS territory sends the CAP:InitiateCallAttempt operation, and request GMSC is called to user's A number, promptly is established to the calling leg (callleg) in IMS territory on original call basis.
Step 420, GMSC response CAP:InitiateCallAttempt request.
The service control point (SCP) of finishing the CCCF entity function in step 430, the CS territory sends CAP:Continue to GMSC.
Step 440, GMSC require to set up in addition a speech channel to media gateway MGW by sending ISUP:IAM message.
Step 450, MGCF/borde gateway controlled function (MGCF/BGCF) entity send to interrogation-call session control function I-CSCF with the IAM message conversion for the SIP INVITE.
Step 460, I-CSCF pass to S-CSCF with SIP INVITE.
Step 470, S-CSCF pass to SIP INVITE the CCCF functional entity in IMS territory.
The CCCF in step 480, IMS territory finishes whole SIP conversation procedure with the 3PCC function.
Step 490, new IMS speech channel are set up and are finished, the calling that the CCCF functional entity control related network entity in CS territory and terminal discharge the CS territory.
From above-mentioned flow process as can be known, UE find the IMS network can with and request when switching to the number A in IMS territory, switching is by the control of CS territory, rather than is controlled by the IMS territory.
Consult shown in Figure 5ly, after the flow process of above-mentioned Fig. 4, the concrete signaling process that switches back to the CS territory from the IMS territory is as follows with calling out:
Step 500, user terminal (IMS territory) send SIP:REFER, and request MGCF/BGCF entity is transferred to speech channel on user's the B number.
Step 510, MGCF/BGCF entity are triggered to the CS territory to calling by GMSC.
Step 520, GMSC inquire about the CAMEL-Subscription-Information of B to attaching position register HLR.
Step 530, HLR return CAMEL-Subscription-Information to GMSC.
Step 540, GMSC send CAP:InitiateDP message to the CCCF in CS territory.
Step 550, because this calling switches to the IMS territory through the CCCF in CS territory before being, CCCF remains with former call information, so the CCCF functional entity is routed to former calling user's B number again by CAP:InitiateCallAttempt operation requests GMSC.
After step 560, the success of switchback CS territory, related entities in the IMS territory and user terminal (IMS) discharge the speech channel in IMS territory.
Consult shown in Fig. 6 A, the main processing procedure that the user who has set up the SIP session in the IMS territory switches to the CS territory is as follows:
The controlled function entity of step 600, user terminal requests signaling plane switches to the CS territory with calling.
The controlled function entity of signaling plane is triggered to the CS territory with calling in step 605, the IMS territory.
As the SCP controlling call handshaking procedure of CCCF entity, between the distant terminal of user terminal and conversation, set up the CS speech channel in step 610, the CS territory.
Step 615, user terminal discharge the IMS speech channel after successfully setting up the CS speech channel.
Consult shown in Fig. 6 B, on the basis of Fig. 6 A, the main processing procedure that the user switches to the IMS territory is as follows:
The user terminal requests in step 650, circuit switching (CS) territory switches to the IMS territory with calling.
Continuous call controlled function CCCF entity in step 655, the CS territory arrives the IMS territory according to routing configuration with call proceeding.
The controlled function entity of signaling plane sends to the CCCF entity with Call Transfer for the INVITE sip message in step 660, the IMS territory, sets up the IMS speech channel by CCCF entity control SIP conversation procedure between the distant terminal of described user terminal and conversation.
Consult shown in Fig. 7 (in conjunction with Fig. 2), two numbers of user's dual-mode terminal are respectively A (IMS) and B (CS), suppose that the user converses with A number and a landline telephone C.The concrete signaling process that switches to the CS territory from the IMS territory is as follows with calling out:
Step 730, HLR return user's CAMEL-Subscription-Information to GMSC.
Step 740, GMSC send the SCP of CAP:InitiateDP to the CS territory.
After step 770, GMSC obtain roaming number, be routed to called number B by VMSC.
Consult shown in Figure 8ly, on the basis of flow process shown in Figure 7, the concrete signaling process that switches back to the IMS territory from the CS territory is as follows with calling out:
Step 800, user terminal (CS) send the MAP:USSD request and call out switching.
The SCP in step 810, CS territory sends the CAP:InitiateCallAttempt operation, and request GMSC is with the A number of call proceeding to the user.
Step 820, GMSC response CAP:InitiateCallAttempt request.
The SCP in step 830, CS territory sends CAP:Continue to GMSC.
Step 840, GMSC send ISUP IAM message, with the MGCF/BGCF entity of call proceeding to the IMS territory.
Step 850, MGCF/BGCF entity send to the I-CSCF entity with the IAM message conversion for the SIP INVITE.
Step 860, I-CSCF entity pass to the S-CSCF entity with SIP INVITE.
Step 870, S-CSCF entity pass to SIP INVITE the CCCF entity in IMS territory.
Step 880, because this calling switches to the CS territory through the CCCF entity in IMS territory before being, the CCCF entity remains with former call information, so the CCCF entity is operated by SIP:REFER, request MGCF was routed to user's A number again with former calling, upgraded promptly that original session information gets final product on the media gateway.
After step 890, new IMS speech channel were set up and finished, user terminal discharged the calling in CS territory.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. a method of switching and keep call continuity between separate network comprises the steps:
The user terminal requests of having set up calling in A, the circuit switching (CS) territory switches to the IMS territory with calling, and described CS territory and IMS territory belong to two separate networks respectively;
Continuous call controlled function CCCF entity in B, the described CS territory arrives described IMS territory with call proceeding;
CCCF entity control SIP conversation procedure in C, the described IMS territory is set up the IMS speech channel between the distant terminal of described user terminal and conversation, and described user terminal discharges the CS calling after setting up the IMS speech channel.
2. the method for claim 1 is characterized in that, step B comprises:
GMSC in this CS of CCCF entity requests territory in the described CS territory arrives the IMS territory with call proceeding;
Described GMSC is with the controlled function entity of call proceeding signaling plane in the IMS territory;
The controlled function entity of described signaling plane is triggered to CCCF entity in the IMS territory with calling.
3. method as claimed in claim 1 or 2 is characterized in that, this method further comprises step:
D, the described user terminal requests of carrying out session in the IMS territory will be called out and be switched go back to described CS territory;
The controlled function entity of signaling plane arrives described CS territory with described call proceeding in E, the IMS territory;
CCCF entity control in F, the described CS territory is arrived described user terminal with call proceeding, and this user terminal discharges the IMS speech channel after setting up the CS speech channel.
4. method as claimed in claim 3 is characterized in that step e comprises:
The controlled function entity of signaling plane is received GMSC in the described CS territory with calling in the IMS territory;
GMSC obtains CCCF entity in the described CS territory by the inquiry CAMEL-Subscription-Information, and calling is triggered to this CCCF entity.
5. method as claimed in claim 3 is characterized in that, in the step F, according to the call information of preserving, notice GMSC arrives described user terminal with call proceeding by the CCCF entity in the described CS territory.
6. method as claimed in claim 3 is characterized in that, the controlled function entity of described signaling plane is borde gateway controlled function BGCF entity or media gateway controlling MGCF functional entity.
7. method as claimed in claim 3 is characterized in that, by the service control point (SCP) as the CCCF entity in the described CS territory.
8. a method of switching and keep call continuity between separate network comprises the steps:
(1) user terminal requests of having set up session in the IMS territory switches to the circuit switching (CS) territory with calling, and described CS territory and IMS territory belong to two separate networks respectively;
(2) the controlled function entity of signaling plane arrives the CS territory with call proceeding in the IMS territory;
(3) control of the continuous call controlled function CCCF entity in the CS territory is arrived described user terminal with call proceeding, and this user terminal discharges the IMS speech channel after setting up calling.
9. method as claimed in claim 8 is characterized in that, step (2) comprising:
GMSC in the IMS territory in the controlled function entity requests CS territory of signaling plane arrives described user terminal with call proceeding;
GMSC obtains CCCF entity in the described CS territory by the inquiry CAMEL-Subscription-Information, and calling is triggered to this CCCF entity.
10. method as claimed in claim 8 is characterized in that, in the step (3), according to the call information of preserving, notice GMSC arrives described user terminal with call proceeding by the CCCF entity in the described CS territory.
11., it is characterized in that this method further comprises step as claim 8,9 or 10 described methods:
(4) the described user terminal requests of having set up calling in the CS territory will be called out and be switched go back to described IMS territory;
(5) the continuous call controlled function CCCF entity in the described CS territory with call proceeding to described IMS territory;
(6) the CCCF entity control SIP conversation procedure in the described IMS territory is set up the IMS speech channel between the distant terminal of described user terminal and conversation, and described user terminal discharges the CS calling after setting up the IMS speech channel.
12. method as claimed in claim 11 is characterized in that, step (5) comprising:
GMSC in this CS of CCCF entity requests territory in the described CS territory arrives the IMS territory with call proceeding;
Described GMSC is with the controlled function entity of call proceeding signaling plane in the IMS territory;
The controlled function entity of described signaling plane is triggered to CCCF entity in the IMS territory with calling.
13. method as claimed in claim 11 is characterized in that, the controlled function entity of described signaling plane is borde gateway controlled function BGCF entity or media gateway controlling MGCF functional entity.
14. method as claimed in claim 8 is characterized in that, by the service control point (SCP) as the CCCF entity in the described CS territory.
15. a communication system comprises CS territory and IMS territory, this CS territory and IMS territory belong to two separate communication networks respectively; It is characterized in that having continuous call controlled function CCCF entity in the described CS territory, have CCCF entity and signaling plane controlled function entity in the described IMS territory;
When user's request switches to the IMS territory with the calling of having set up in the CS territory, CCCF entity control in the described CS territory is arrived described IMS territory with call proceeding, CCCF entity control SIP conversation procedure in the IMS territory is set up the IMS speech channel between the user, and the control of the CCCF entity in CS territory related entities discharges the CS call resources after setting up the IMS speech channel; Perhaps, user request will have been set up session when switching to the CS territory in the IMS territory, the controlled function entity of signaling plane arrives the CS territory with call proceeding in the IMS territory, continuous call controlled function CCCF entity control in the CS territory is arrived the user with call proceeding, and the CCCF entity control related entities in setting up IMS territory, calling back, CS territory discharges the IMS call resources.
16. communication system as claimed in claim 15 is characterized in that, the CCCF entity in the CS territory is the service control point (SCP).
17., it is characterized in that the CCCF entity in the IMS territory is an application server AS as claim 15 or 16 described communication systems.
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| CN101227677B (en) * | 2008-02-05 | 2011-06-22 | 中兴通讯股份有限公司 | Single wireless channel voice business continuity field switching method |
| WO2011130949A1 (en) * | 2010-04-23 | 2011-10-27 | 中兴通讯股份有限公司 | Method and system for implementing reverse single radio voice call continuity |
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| CN101291534B (en) * | 2008-05-23 | 2012-01-11 | 中兴通讯股份有限公司 | Method for transmission facility to trigger resource control system for guarantee continuity of conversation |
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| WO2011130949A1 (en) * | 2010-04-23 | 2011-10-27 | 中兴通讯股份有限公司 | Method and system for implementing reverse single radio voice call continuity |
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| US9326302B2 (en) | 2010-04-23 | 2016-04-26 | Zte Corporation | Method and system for implementing reverse single radio voice call continuity |
| WO2012027939A1 (en) * | 2010-09-03 | 2012-03-08 | 中兴通讯股份有限公司 | One-number-service calling method and service control point |
| CN102801701A (en) * | 2012-03-25 | 2012-11-28 | 青岛百灵信息科技有限公司 | Application correlator for session initiation protocol (SIP) network and user application network |
| WO2014173347A1 (en) * | 2013-08-28 | 2014-10-30 | 中兴通讯股份有限公司 | Single radio voice call continuity handover configuration method, switching method and device |
| CN104427560A (en) * | 2013-08-28 | 2015-03-18 | 中兴通讯股份有限公司 | Single radio voice call continuity switching configuration method, switching method and device |
| CN104427560B (en) * | 2013-08-28 | 2019-10-25 | 中兴通讯股份有限公司 | Single radio voice call continuity handover configurations method, switching method and equipment |
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