CN103916547A

CN103916547A - Method for realizing callback service and calling side server

Info

Publication number: CN103916547A
Application number: CN201210592484.4A
Authority: CN
Inventors: 黄兴; 左俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-12-31
Filing date: 2012-12-31
Publication date: 2014-07-09
Anticipated expiration: 2032-12-31
Also published as: CN103916547B

Abstract

An embodiment of the invention discloses a method for realizing callback service. In the method, after receiving instruction of activating CCBS or CCNR or CCNL service from a calling user, a calling side server starts a call attempt timer and enters a call attempt process. The call attempt process comprises constructing a session invitation message and transmitting to a called user when the time set by the call attempt timer is up and the calling user is in an idle state; receiving a session invitation response message returned by the called user, and if the response message indicates that the called user is still unable to connect, restarting call attempt timer and entering the call attempt process; and connecting the calling user with the called user if the response message indicates that the called user is available. The embodiment of the invention also provides the calling side server. The embodiment of the invention can be used for achieving the CCBS or CCNR or CCNL service only if the calling side server supports the callback service and no cooperation of other network is needed.

Description

A kind of method and Calling Side server of realizing call back service

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method and Calling Side server of realizing call back service.

Background technology

3GPP(The3rd Generation Partnership Project, third generation partner program) TS(Technical Specification, technical specification) 24.642 define CCBS(Completion of Communications to Busy Subscriber, calling back when busy) or CCNR(Completion of Communications by No Reply, nonreply callback) or CCNL(Completion of Communications on Not Logged-in, off-line callback) flow process, realize and in the time of calling user dials called phone busy or nonreply or off-line, can use busy or nonreply or the off-line phone that this business is called out wish to be registered in IMS(IP Multimedia Subsystem, IP Multimedia System) on, automatically monitored the state of called phone by IMS.In the time that called phone is idle, calling subscriber's phone is ring, and now calling subscriber only need mention microphone and can automatically connect the other side.

For above-mentioned callback class business, the implementation method in existing specification, requires Calling Side AS(Application Server, application server) and the degree of coupling of callee side AS higher.If callee side AS does not support call back service, this business cannot realize.Meanwhile, in existing method, higher to the signaling request between Calling Side AS and callee side AS, for example, under the scene of many AS series connection, require the subscription of AS transparent transmission or the notification message etc. of series connection, but in fact a lot of AS cannot support this series of requirement.Also have, at IMS and NGN(Next-Generation Network, next generation network) or 2G (Second Generation, second generation mobile communication technology) network or 3G (Third Generation, third generation mobile technology) under network interworking networking, if opposite end NGN or 2G or 3G do not support this fit system of 3GPP TS24.642, also cannot realize call back service.

Summary of the invention

The invention provides a kind of method and Calling Side server of realizing call back service, only need Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business.

First aspect, provides a kind of method that realizes call back service, and described method comprises: described Calling Side server receives after the instruction that calling subscriber activates calling back when busy or nonreply callback or off-line call back service, starts call attempt timer, enters call attempt flow process; Described call attempt flow process comprises the following steps: in the time reaching the timing of described call attempt timer and determine described calling subscriber in idle condition, build the session invitation message of calling out called subscriber, be sent to described called subscriber; Receive the session invitation response message that described called subscriber returns, if described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer, enter call attempt flow process; If described in the session invitation response message returned show that described called subscriber can connect, and connects described calling subscriber and called subscriber.

In the possible implementation of the first of first aspect, the described session invitation response message of returning shows that described called subscriber still cannot connect and be specially: in the time that described Calling Side server receives calling subscriber and activates call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition; Or, in the time that described Calling Side server receives calling subscriber and activates nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state; Or, in the time that described Calling Side server receives calling subscriber and activates off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

In the possible implementation of the second of first aspect, the described session invitation response message of returning shows that described called subscriber can connect and is specially: in the time that described Calling Side server receives calling subscriber and activates calling back when busy or off-line call back service, described in the session invitation response message returned be described called subscriber's ALERTING message; Or, in the time that described Calling Side server receives calling subscriber and activates nonreply call back service, described in the session invitation response message returned be described called subscriber's offhook message.

In conjunction with the above-mentioned any possible implementation of first aspect, in the third possible implementation of first aspect, at described startup call attempt timer, before entering call attempt flow process, described method also comprises: setting current number of call attempts is 1; After the message of returning the described called subscriber of described reception, before restarting the step of call attempt timer described in execution, described method also comprises: judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, restart the step of call attempt timer described in execution; If not, winding-up flow process.

In conjunction with the first and the possible implementation of the second of first aspect, in the 4th kind of possible implementation of first aspect, at described startup call attempt timer, before entering call attempt flow process, described method also comprises: the number information of preserving described called subscriber; The session invitation message that described structure is called out described called subscriber is specially: build the session invitation message of calling out described called subscriber according to the described called subscriber's who preserves number information.

In conjunction with the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, described session invitation message comprises third party call control 3PCC mark, and described mark is initiated by described Calling Side server for showing described calling.

In conjunction with the above-mentioned any possible implementation of first aspect, in the 6th kind of possible implementation of first aspect, described call attempt flow process also comprises: in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, enter Call Waiting flow process; Described Call Waiting flow process comprises the following steps: restart call attempt timer; Again reach after the timing of described call attempt timer, rejudge described calling subscriber's state, if calling subscriber, in busy state, enters Call Waiting flow process; Otherwise, carry out described structure and call out the step of called subscriber's session invitation message.

In conjunction with the 6th kind of possible implementation of first aspect, in the 7th kind of possible implementation of first aspect, described in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, enter Call Waiting flow process before, described method also comprises: setting current wait number of times is 1; The described state that rejudges described calling subscriber, if calling subscriber is in the time of busy state, before entering Call Waiting flow process, described method also comprises: judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, enter Call Waiting flow process; If not, winding-up flow process.

In conjunction with the above-mentioned any possible implementation of first aspect, in the 8th kind of possible implementation of first aspect, described calling subscriber and described called subscriber are in IP Multimedia System IMS territory in networking; Or described calling subscriber and described called subscriber are between IMS territory in networking; Or, in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

Second aspect, provides a kind of Calling Side server, and described server comprises: call attempt timer; Receiving element, activates the instruction of calling back when busy or nonreply callback or off-line call back service for receiving calling subscriber; Timer start unit, for receiving after described instruction when described receiving element, starts described call attempt timer; Message construction unit, for reaching the timing of described call attempt timer and determining that described calling subscriber when the idle condition, builds the session invitation message of calling out described called subscriber; Transmitting element, for being sent to described called subscriber by described session invitation message; Described receiving element, the session invitation response message of also returning for receiving described called subscriber; First timer is restarted unit, if for described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer, trigger described message construction unit; Session on-unit, if for described in the session invitation response message returned show that described called subscriber can connect, and connects calling subscriber and called subscriber.

In the possible implementation of the first of second aspect, the described session invitation response message of returning shows that described called subscriber still cannot connect and be specially: in the time that described receiving element receives calling subscriber and activates the instruction of call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition; Or, in the time that described receiving element receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state; Or, in the time that described receiving element receives calling subscriber and activates the instruction of off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

In the possible implementation of the second of second aspect, the described message of returning shows that described called subscriber can connect and is specially: in the time that described receiving element receives calling subscriber and activates the instruction of calling back when busy or off-line call back service, described in the session invitation response message returned be the message of described called subscriber's ring; Or, in the time that described receiving element receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber's off-hook.

In conjunction with the above-mentioned any possible implementation of second aspect, in the third possible implementation of second aspect, described server also comprises: number of call attempts setup unit, and before starting described call attempt timer at described timer start unit, setting current number of call attempts is 1; Number of call attempts judging unit, for restarting at described first timer before unit restarts described call attempt timer, judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, trigger described first timer and restart unit; If not, winding-up flow process.

In conjunction with the first and the possible implementation of the second of second aspect, in the 4th kind of possible implementation of second aspect, described server also comprises: memory cell, before starting described call attempt timer at described timer start unit, preserve described called subscriber's number information; The described called subscriber's that described message construction unit is preserved according to described memory cell number information builds described session invitation message.

In conjunction with the 4th kind of possible implementation of second aspect, in the 5th kind of possible implementation of second aspect, described session invitation message comprises third party call control 3PCC mark, and described mark is initiated by described Calling Side server for showing described calling.

In conjunction with the above-mentioned any possible implementation of second aspect, in the 6th kind of possible implementation of second aspect, described server also comprises: wait for start unit, for in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, trigger call attempt wait unit; Described call attempt is waited for unit, for restarting described call attempt timer, reaches after the timing of described call attempt timer, rejudges described calling subscriber's state, waits for unit if calling subscriber in busy state, triggers described call attempt; Otherwise, trigger described message construction unit.

In conjunction with the 6th kind of possible implementation of second aspect, in the 7th kind of possible implementation of second aspect, described wait start unit, also, in the time triggering described call attempt wait unit, setting current wait number of times is 1; Described server also comprises: number of call attempts judging unit, before waiting for that at described call attempt unit restarts described call attempt timer, judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, trigger described call attempt and wait for unit; If not, winding-up flow process.

In conjunction with the above-mentioned any possible implementation of second aspect, in the 8th kind of possible implementation of second aspect, described calling subscriber and described called subscriber are in IP Multimedia System IMS territory in networking; Or described calling subscriber and described called subscriber are between IMS territory in networking; Or, in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

Method and Calling Side server described in the embodiment of the present invention, when calling subscriber calls out called subscriber, run into called subscriber in the time that busy or nonreply or off-line state cause non-answered call, if calling subscriber activates calling back when busy or nonreply callback or off-line call back service, Calling Side startup of server call attempt timer, definite described calling subscriber during in idle condition, Calling Side server at regular intervals section just builds the session invitation message of calling out called subscriber, be initiated to described called subscriber's calling, until called subscriber's free time, and reply corresponding ring response, reinforming calling subscriber answers, thereby set up the call between calling subscriber and called subscriber.

As can be seen here, in the embodiment of the present invention, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, greatly reduce thus the difficulty of calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL service deployment.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 a is the method flow diagram of realizing call back service of the embodiment of the present invention;

Fig. 1 b is the method flow diagram of realizing call back service of the embodiment of the present invention one;

Fig. 2 is the method signaling process figure that realizes call back service of the embodiment of the present invention two;

Fig. 3 is the method signaling process figure that realizes call back service of the embodiment of the present invention three;

Fig. 4 is the method signaling process figure that realizes call back service of the embodiment of the present invention four;

Fig. 5 is the method signaling process figure that realizes call back service of the embodiment of the present invention five;

Fig. 6 is the method signaling process figure that realizes call back service of the embodiment of the present invention six;

Fig. 7 is the method signaling process figure that realizes call back service of the embodiment of the present invention seven;

Fig. 8 is the method signaling process figure that realizes call back service of the embodiment of the present invention eight;

Fig. 9 is the method signaling process figure that realizes call back service of the embodiment of the present invention nine;

Figure 10 is the method signaling process figure that realizes call back service of the embodiment of the present invention ten;

Figure 11 is the structure chart of the Calling Side server of the embodiment of the present invention;

Figure 12 is the equipment structure chart that the embodiment of the present invention realizes the method for call back service.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out to clear, complete description, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of method and Calling Side server of realizing call back service, only need Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business.

With reference to Fig. 1 a, the method flow diagram of realizing call back service providing for the embodiment of the present invention.As shown in Figure 1a, described method can comprise the following steps:

Step S10: Calling Side server receives after the instruction that calling subscriber activates calling back when busy or nonreply callback or off-line call back service, starts call attempt timer, enters call attempt flow process S20.

Described call attempt flow process S20 can comprise the following steps:

S20: in the time reaching the timing of described call attempt timer and determine described calling subscriber in idle condition, described Calling Side server construction is called out called subscriber's session invitation message, is sent to described called subscriber; Described Calling Side server receives the session invitation response message that described called subscriber returns, if described in the session invitation response message returned show that described called subscriber still cannot connect, restart call attempt timer, enter call attempt flow process S20; If described in the session invitation response message returned when described in the message returned show that described called subscriber can connect, and connects calling subscriber and called subscriber.

Described in the embodiment of the present invention in method, when calling subscriber calls out called subscriber, run into called subscriber in the time that busy or nonreply or off-line state cause non-answered call, if calling subscriber activates calling back when busy or nonreply callback or off-line call back service, Calling Side startup of server call attempt timer, definite described calling subscriber during in idle condition, Calling Side server at regular intervals section just builds the session invitation message of calling out called subscriber, be initiated to described called subscriber's calling, until called subscriber's free time, and reply and shown after message that called subscriber can connect, reinforming calling subscriber answers, thereby set up the call between calling subscriber and called subscriber.

As can be seen here, method described in the embodiment of the present invention, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, greatly reduce thus the difficulty of calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL service deployment.

It should be noted that, the described session invitation response message of returning shows that described called subscriber still cannot connect and be specially: in the time that described Calling Side server receives calling subscriber and activates the instruction of call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition; Or, in the time that described Calling Side server receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state; Or, in the time that described Calling Side server receives calling subscriber and activates the instruction of off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

What need to further illustrate is, the described session invitation response message of returning is the message of described called subscriber in nonreply state, be specifically as follows: Calling Side monitoring server is to called subscriber's ring, start timer, in the time of timer expiry, still do not monitor called subscriber's off-hook, now Calling Side server determines that called subscriber is in unresponsive state.

The described session invitation response message of returning shows that described called subscriber can connect and is specially: in the time that described Calling Side server receives calling subscriber and activates the instruction of calling back when busy or off-line call back service, described in the session invitation response message returned be the message of described called subscriber's ring; Or, in the time that described Calling Side server receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber's off-hook.

Further, for fear of occur that call attempt all unsuccessfully causes business to be absorbed in the phenomenon of endless loop always, described in the various embodiments described above of the present invention in method: start call attempt timer in step S10, before entering call attempt flow process, described method can also comprise: setting current number of call attempts is 1.

In step S20, after the message of returning the described called subscriber of described reception, before restarting the step of call attempt timer described in execution, described method also comprises: judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, restart the step of call attempt timer described in execution; If not, winding-up flow process.

In actual applications, described default maximum number of call attempts can be by Calling Side server flexible configuration.Such as, can set described maximum number of call attempts is 10 times.

Further, described in the various embodiments described above of the present invention in method: start call attempt timer in step S10, before entering call attempt flow process, described method can also comprise: the number information of preserving described called subscriber.

In step S20, the session invitation message that described structure is called out described called subscriber is specially: build the session invitation message of calling out described called subscriber according to the described called subscriber's who preserves number information.

Further, in the session invitation message of described Calling Side server construction, carry 3PCC((Third Party Call Control, third party call control) mark, described mark is this time called out and is initiated by Calling Side server for showing.

Further, described in the embodiment of the present invention in method, when entering call attempt flow process, while reaching the timing of described call attempt timer, only definite described calling subscriber under idle state, just can carry out described structure and call out the step of called subscriber's session invitation message; And in the time determining calling subscriber in busy state, Calling Side server enters Call Waiting flow process, concrete, described Call Waiting flow process can comprise: restart call attempt timer; When again reaching after the timing of described call attempt timer, rejudge described calling subscriber's state, if calling subscriber, in busy state, continues to enter Call Waiting flow process; Otherwise, carry out described structure and call out the step of called subscriber's session invitation message.

For fear of occur causing business to be absorbed in the phenomenon of endless loop in busy state because of calling subscriber always, described in the various embodiments described above of the present invention in method: definite described calling subscriber, before busy state enters Call Waiting flow process, described method also comprises: setting current wait number of times is 1.

Wait in flow process at call attempt, when the described state that rejudges described calling subscriber, if calling subscriber is in the time of busy state, before continuing to enter Call Waiting flow process, described method also comprises: judge whether described current wait number of times is less than or equal to default maximum wait number of times, if so, described current wait number of times is added to 1, enter Call Waiting flow process; If not, winding-up flow process.

In actual applications, described default maximum wait number of times can be by Calling Side server flexible configuration.Such as, can set described maximum wait number of times is 10 times.

It should be noted that, in the method described in the various embodiments described above of the present invention, described calling subscriber and described called subscriber can be in IP Multimedia System IMS territory in networkings; Or described calling subscriber and described called subscriber are between IMS territory in networking; Or, in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

Below in conjunction with provided by the invention one preferably embodiment method provided by the invention is described in detail.

With reference to Fig. 1 b, the method flow diagram of realizing call back service providing for the embodiment of the present invention one.As shown in Figure 1, said method comprising the steps of:

Step S101: calling subscriber UE-A initiates to the calling of called subscriber UE-B, called subscriber UE-B is in busy or nonreply or off-line state, Calling Side server, for example O-AS receives the message of called subscriber UE-B in busy or nonreply or off-line state.

Step S102: described Calling Side server O-AS judges whether described calling subscriber UE-A supports calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, if supported, sends information to calling subscriber UE-A, enters step S103; If do not supported, call release, this time end of calling.

Wherein, described information is used for pointing out calling subscriber UE-A to activate CCBS or CCNR or CCNL business.

Step S103: calling subscriber UE-A receives after described information, receive IVR(Interactive Voice Response, interactive voice response) playback, select whether to activate described CCBS or CCNR or CCNL business, if selection activating service sends corresponding activating service according to prompting and indicates to Calling Side server O-AS, and receiving after the successful feedback of activating service, on-hook, enters step S104; If select not activating service, calling subscriber UE-A on-hook, call release, this time end of calling.

Step S104: Calling Side server O-AS receives after the instruction that calling subscriber activates CCBS or CCNR or CCNL business, starts call attempt timer, and to set current number of call attempts be 1, preserves the number information of called subscriber UE-B.

Step S105: when described call attempt timer expiry (being the timing that reaches call attempt timer), Calling Side server O-AS judges that whether described calling subscriber UE-A is in idle condition, if, described Calling Side server O-AS builds the session invitation INVITE of calling out called subscriber UE-A according to the number information of the called subscriber UE-B preserving in step S104, be sent to described called subscriber UE-A, enter step S106; If not, enter step S108.

Wherein, in the INVITE that described Calling Side server O-AS builds, carry the mark of 3PCC.Described 3POC mark shows that this calling initiated by Calling Side server O-AS.

It should be noted that, described call attempt timer expiry is the timing that reaches described call attempt timer.For example, the timing of setting described call attempt timer is 10s, after the described call attempt timer 10s of startup, is described call attempt timer expiry.

Step S106: if the called subscriber UE-B free time, called subscriber UE-B ring, returns to ring response message to Calling Side server O-AS; If called subscriber UE-B still in busy or nonreply or off-line state, returns to busy or nonreply or deferred information to Calling Side server O-AS.

Step S107: described Calling Side server O-AS judges the type of the message that described called subscriber UE-B returns, when the described message of returning during in busy or nonreply or off-line state, enters step S108 for called subscriber UE-B; In the time that the described message of returning is called subscriber UE-B ring, send session invitation INVITE to calling subscriber UE-A, enter step S109.

Step S108: described Calling Side server O-AS judges whether current number of call attempts is less than or equal to default maximum number of call attempts, if, described Calling Side server O-AS adds 1 by described current number of call attempts, and restarts call attempt timer, returns to step S105; If not, call back service failure, described Calling Side server O-AS call release, winding-up flow process.

Step S109: called subscriber UE-B off-hook, answer session; Calling Side O-AS is to MRF(Media Resource Function, media resource function) apply for putting call proceeding prompt tone to called subscriber UE-B.

Step S110: calling subscriber UE-A off-hook, answer session; Calling Side O-AS discharges the playback resource of MRF.

Step S111: calling subscriber UE-A and called subscriber UE-B set up call.

Described in the embodiment of the present invention one in method, when calling subscriber calls out called subscriber, run into called subscriber in the time that busy or nonreply or off-line state cause non-answered call, if calling subscriber activates calling back when busy or nonreply callback or off-line call back service, Calling Side startup of server call attempt timer, definite described calling subscriber during in idle condition, Calling Side server at regular intervals section just builds the session invitation message of calling out called subscriber, be initiated to described called subscriber's calling, until called subscriber's free time, and reply corresponding ring response, reinforming calling subscriber answers, thereby set up the call between calling subscriber and called subscriber.

As can be seen here, method described in the embodiment of the present invention one, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, greatly reduce thus the difficulty of calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL service deployment.

Described in the embodiment of the present invention one in method, in the message that the called subscriber that Calling Side server receives returns, do not need to carry any information about whether supporting call back service, just can realize callback class business.Meanwhile, when called subscriber returns after the message of ring, Calling Side server is just initiated the calling to calling subscriber, waits for to called subscriber's playback prompting simultaneously, and user's business experience is promoted to some extent.

Further, described in the embodiment of the present invention one in method, for avoid occurring that call attempt all unsuccessfully causes business to be absorbed in the phenomenon of endless loop always, set a current number of call attempts number of times, after each call attempt finishes, described current number of call attempts adds 1, after described current number of call attempts reaches default maximum number of call attempts, stop making a call to called subscriber, terminated call flow process.In actual applications, described default maximum number of call attempts can be by Calling Side server O-AS flexible configuration.Such as, can set described maximum number of call attempts is 10 times.

Mention above, 3GPP TS24.642 has defined CCBS or CCNR or tri-kinds of flow processs of CCNL.For these three kinds of call back services, respectively method provided by the invention is described in detail below.

Embodiment bis-:

The method that the embodiment of the present invention two provides is for realizing the CCBS business under networking in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCBS business.

With reference to Fig. 2, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention two.In embodiment bis-, calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

As shown in Figure 2, described method can comprise the following steps:

Step S201 ~ step S205: calling subscriber UE-A initiates call and invites, sends INVITE session invitation message to called subscriber UE-B.

Concrete, this process comprises the following steps:

Step S201: calling subscriber UE-A sends INVITE to IMS Core(IP Multimedia Subsystem Core Network, IP Multimedia System core network), be initiated to the calling of called subscriber UE-B.

Step S202: INVITE is triggered to Calling Side server O-AS by the IMS Core of Calling Side.Described Calling Side server O-AS carries out the Business Processing of calling subscriber UE-A.

Step S203: Calling Side server O-AS handles after the business of calling subscriber UE-A, and call routing is to IMS Core.

Step S204:IMS Core routes the call to the IMS core network of callee side; INVITE is triggered to callee side server T-AS by the IMS core network of callee side, and callee side server T-AS carries out the Business Processing of called subscriber UE-B.

Step 205: callee side server T-AS handles after the business of called subscriber UE-B, and call routing is got back to IMS Core; IMS Core is routed to INVITE called subscriber UE-B again.

It should be noted that, here in order to reduce the size of message in message sequence chart, in Fig. 2, routed path being economized to the routed path that callee side server T-AS is slightly routed directly to called subscriber UE-B(reality is: callee side server T-AS route is returned IMS Core, and IMS Core is routed to called subscriber UE-B again).

Step S206 ~ step S212: callee side server T-AS receives that the 486Busy(user that called subscriber UE-B returns is busy) when response message, described 486Busy response message is sent to Calling Side server O-AS; Described Calling Side server O-AS judges whether to activate CCBS business, if can, prompting calling subscriber UE-A activates CCBS business; Described Calling Side server O-AS receives after the instruction of calling subscriber UE-A activation CCBS, starts call attempt timer.

Concrete, this process comprises the following steps:

Step S206: because called subscriber UE-B converses, called subscriber UE-B is for the INVITE of receiving, sends 486Busy(user busy) response message is to callee side server T-AS, prompting called subscriber busy.

Step S207 ~ 208: callee side server T-AS routes to Calling Side server O-AS by 486Busy response message through IMS Core.

Step S209 ~ 210: Calling Side server O-AS receives after this 486Busy response message, judge whether calling subscriber UE-A opens CCBS business.If calling subscriber has opened CCBS business, Calling Side server O-AS sends 183Session progress(prompting session progress so) message is to calling subscriber UE-A.Calling subscriber UE-A application MRF(Media Resource Function, media resource function) resource carries out IVR(Interactive Voice Response, interactive voice response) playback and collect dialing information.This IVR playback prompting calling subscriber UE-A (for example activates CCBS business, now calling subscriber UE-A can hear " called subscriber busy; activate call back on busy service and request 5 "), now, for example, if calling subscriber UE-A has activated call back on busy service (having dialled button 5) and MRF or O-AS and collected after the information of this button 5, Calling Side server O-AS starts call attempt timer.Now, calling subscriber UE-A can also hear the prompt tone of " supplementary service activates successfully ".Meanwhile, Calling Side server O-AS preserves the number information (in the time of call attempt timer expiry, need to use this number information again to call out called subscriber UE-B) of called subscriber UE-B.

It should be noted that, in above-mentioned steps, do not open CCBS business, call release, winding-up flow process if Calling Side server O-AS judges calling subscriber UE-A.

Further, for example, if but calling subscriber UE-A has opened CCBS business calling subscriber UE-A does not activate call back on busy service (dialing button 5), same call release, this end of calling.

It should be noted that, the default value of described call attempt timer can be generally 10s.

Step S211 ~ 212: discharge after sound, Calling Side server O-AS can send 486Busy response message to IMS Core, is then routed to calling subscriber UE-A.At this moment the calling of calling subscriber UE-A calling called subscriber UE-B is complete, the calling subscriber UE-A free time.

Step S213～step S218: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to called subscriber UE-B.If now called subscriber UE-B is still busy, again return 486Busy response message.

Step S213: after described call attempt timer expiry, Calling Side server O-AS checks the busy-idle condition of calling subscriber UE-A, if calling subscriber UE-A is in busy condition (such as calling subscriber UE-A converses), Calling Side server O-AS restarts call attempt timer so; If calling subscriber UE-A is in idle condition, Calling Side server O-AS takes out the number information of the called subscriber UE-B preserving in step S209 so, constructs an INVITE of calling out called subscriber UE-B, is routed to IMS Core.

It should be noted that the mark of carrying 3POC in the INVITE of Calling Side server O-AS structure in step S213.Described 3POC mark shows that this calling initiated by Calling Side server O-AS.

The INVITE of this call attempt is triggered to callee side server T-AS by step S214:IMS Core.

Step S215: INVITE is routed to called subscriber UE-B by callee side server T-AS.

Step S216: if now called subscriber UE-B is also in call, called subscriber UE-B returns 486Busy response message.

Step S217 ~ 218: callee side server T-AS is routed to Calling Side server O-AS by 486Busy response message through IMS Core.

It should be noted that, in the embodiment of the present invention, when after call attempt timer expiry, create new initial INVITE message by Calling Side server O-AS for called subscriber UE-B, and this INVITE is sent to callee side server T-AS, call out to detect the state of called subscriber UE-B according to this INVITE.If called subscriber UE-B still returns to failure response message for this INVITE request, Calling Side server O-AS can restart call attempt timer again, create new INVITE, initiate new calling, until the calling that Calling Side server O-AS initiates is successfully processed.

Concrete, in the time that the INVITE newly creating is routed to callee side server T-AS by Calling Side server O-AS, described callee side server T-AS possibly cannot judge called subscriber's UE-B busy-idle condition, or called subscriber UE-B is exactly now in the situation of idle condition, and this INVITE may be routed to called subscriber UE-B.

Certainly, in actual applications, for fear of there is all failed situations of call attempt always, the number of times that starts call attempt timer can be by Calling Side server O-AS flexible configuration.Such as, the number of times that can set startup call attempt timer can be configured to 10 times.

Step S219 ~ step S224: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180(ring) response message.

Step S225～step S228: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S229～step S231: called subscriber UE-B off-hook.

Step S232～step S235: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S236～step S237: calling subscriber UE-A off-hook.

Step S238～step S239: Calling Side server O-AS discharges the playback resource of MRF.

Step S240～step S249: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S250: after heavily consulting successfully, calling subscriber UE-A and called subscriber UE-B set up call.

Described in the embodiment of the present invention two, method is for realizing the CCBS business under networking in IMS territory, and now calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

Method described in the embodiment of the present invention two, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS business, greatly reduces thus the difficulty of calling back when busy CCBS service deployment.

Embodiment tri-:

The method that the embodiment of the present invention three provides is for realizing the CCBS business under networking between IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCBS business.

With reference to Fig. 3, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention three.In embodiment tri-, calling subscriber UE-A accesses in IMS core network, called subscriber UE-B does not access in IMS core network, and for example called subscriber UE-B can access the Network at PSTN(Public Switched Telephone, PSTN) or NGN.

As shown in Figure 3, described method can comprise the following steps:

Step S301 ~ step S305: calling subscriber UE-A initiates call and invites, sends INVITE to MGCF(Media Gateway Control Function, MGCF), routed the call to the called subscriber UE-B that is positioned at other territories by MGCF

Step S306 ~ step S312:MGCF receives that the 486Busy(user that called subscriber UE-B returns is busy) when response message, described 486Busy response message is sent to Calling Side server O-AS; Described Calling Side server O-AS judges whether to activate CCBS business, if can, prompting calling subscriber UE-A activates CCBS business; Described Calling Side server O-AS receives after the instruction of calling subscriber UE-A activation CCBS, starts call attempt timer.

Step S313～step S318: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to MGCF, MGCF routes the call to the called subscriber UE-B that is positioned at other territories.If now called subscriber UE-B is still busy, MGCF returns 486Busy failure response message again.

It should be noted that, in the embodiment of the present invention, when after call attempt timer expiry, create new initial INVITE message by Calling Side server O-AS for called subscriber UE-B, and this INVITE is sent to MGCF, call out to detect the state of called subscriber UE-B according to this INVITE.If called subscriber UE-B still returns to failure response message for this INVITE request, Calling Side server O-AS can restart call attempt timer again, create new INVITE, initiate new calling, until the calling that Calling Side server O-AS initiates is successfully processed.

Concrete, in the time that the INVITE newly creating is routed to MGCF by Calling Side server O-AS, described MGCF possibly cannot judge called subscriber's UE-B busy-idle condition, or called subscriber UE-B is exactly now in the situation of idle condition, and this INVITE may be routed to called subscriber UE-B.

Step S319 ~ step S324: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to MGCF.If the now called subscriber UE-B free time, called subscriber UE-B ring, MGCF returns 180(ring) response message.

Step S325～step S328: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S329～step S331: the called subscriber UE-B off-hook that is positioned at other territories.

Step S332～step S335: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S336～step S337: calling subscriber UE-A off-hook.

Step S338～step S339: Calling Side server O-AS discharges the playback resource of MRF.

Step S340～step S349: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S350: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention three, method is for realizing the CCBS business under networking between IMS territory, and now calling subscriber UE-A and called subscriber UE-B access respectively in different IMS core networks.

Method described in the embodiment of the present invention three, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS business, greatly reduces thus the difficulty of calling back when busy CCBS service deployment.

Embodiment tetra-:

The method that the embodiment of the present invention four provides is for realizing the CCBS business under many AS series connection networkings in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCBS business.

With reference to Fig. 4, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention four.In embodiment tetra-, calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

As shown in Figure 4, described method can comprise the following steps:

Step S401 ~ step S407: calling subscriber UE-A initiates call and invites, sends INVITE to called subscriber UE-B.Now, this INVITE has successively passed through Calling Side server O-AS, other AS and tri-servers of callee side server T-AS.

Step S408 ~ step S416: callee side server T-AS receives the 486Busy response message that called subscriber UE-B returns, by 486Busy response message other AS that sent to Calling Side server O-AS(passage in transit).Calling Side server O-AS judges whether to activate CCBS business, if can, prompting calling subscriber UE-A activates CCBS.Described Calling Side server O-AS receives that calling subscriber UE-A activates after the instruction of CCBS, starts call attempt timer.

Step S417～step S426: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send new INVITE to called subscriber UE-B.If now called subscriber UE-B is still busy, again return 486Busy response message.

Step S427 ~ step S436: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180 response messages.

Step S437～step S440: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S441～step S445: called subscriber UE-B off-hook.

Step S446～step S449: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S450～step S451: calling subscriber UE-A off-hook.

Step S452～step S453: Calling Side server O-AS discharges the playback resource of MRF.

Step S454～step S467: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S468: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention four, method is for realizing the CCBS business under many AS series connection networkings in IMS territory, and now calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

Method described in the embodiment of the present invention four, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS business, greatly reduces thus the difficulty of calling back when busy CCBS service deployment.

Embodiment five:

The method that the embodiment of the present invention five provides is for realizing the CCNR business under networking in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNR business.

With reference to Fig. 5, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention five.In embodiment five, calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

As shown in Figure 5, described method can comprise the following steps:

Step S501 ~ step S505: calling subscriber UE-A initiates call and invites, sends INVITE to called subscriber UE-B.

Step S506 ~ step S510: called subscriber UE-B ring, return 180 response messages.

Step S511 ~ step S515: Calling Side server O-AS nonreply timer expiry, Calling Side server O-AS judges whether to activate CCNR business, if can, prompting calling subscriber UE-A activates CCNR business.Described Calling Side server O-AS receives that calling subscriber UE-A activates after the instruction of CCNR, starts call attempt timer.

Step S516 ~ step S524: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to called subscriber UE-B.Called subscriber UE-B ring, return 180 response messages, but called subscriber UE-B does not still have off-hook to answer.

It should be noted that, in the embodiment of the present invention, when after call attempt timer expiry, create new initial INVITE message by Calling Side server O-AS for called subscriber UE-B, and this INVITE is sent to callee side server T-AS, call out to detect the state of called subscriber UE-B according to this INVITE.If called subscriber UE-B still returns to failure response message or called subscriber UE-B nonreply always for this INVITE request, Calling Side server O-AS can restart call attempt timer again, create new INVITE, initiate new calling, until the calling that Calling Side server O-AS initiates successfully processed, till being called subscriber UE-B off-hook and answering.

Step S525 ~ step S530: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180(ring) response message.

Step S531～step S533: called subscriber UE-B off-hook.

Step S534～step S537: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S538～step S541: Calling Side server O-AS sends INVITE to calling subscriber UE-A, and calling subscriber UE-A ring, returns 180 response messages.

Step S542 ~ step S543: calling subscriber UE-A off-hook.

Step S:544～step S545: Calling Side server O-AS discharges the playback resource of MRF.

Step S546～step S555: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S556: after heavily consulting successfully, calling subscriber UE-A and called subscriber UE-B set up call.

Described in the embodiment of the present invention five, method is for realizing the CCNR business under networking in IMS territory, and now calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

Method described in the embodiment of the present invention five, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize nonreply callback CCNR business, greatly reduces thus the difficulty of nonreply callback CCNR service deployment.

Embodiment six:

The method that the embodiment of the present invention six provides is for realizing the CCNR business under networking between IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNR business.

With reference to Fig. 6, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention six.In embodiment six, calling subscriber UE-A accesses in IMS core network, and called subscriber UE-B does not access in IMS core network.

As shown in Figure 6, described method can comprise the following steps:

Step S601 ~ step S605: calling subscriber UE-A initiates call and invites, sends INVITE to MGCF, is routed the call to the called subscriber UE-B that is positioned at other territories by MGCF.

Step S606 ~ step S610: called subscriber UE-B ring, MGCF returns 180 response messages.

Step S611 ~ step S615: Calling Side server O-AS nonreply timer expiry, Calling Side server O-AS judges whether to activate CCNR business, if can, prompting calling subscriber UE-A activates CCNR business.Described Calling Side server O-AS receives that calling subscriber UE-A activates after the instruction of CCNR, starts call attempt timer.

Step S616～step S624: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to MGCF, MGCF routes the call to the called subscriber UE-B that is positioned at other territories.Called subscriber UE-B ring, MGCF returns 180 response messages, but called subscriber UE-B does not still have off-hook to answer.

It should be noted that, in the embodiment of the present invention, when after call attempt timer expiry, create new initial INVITE message by Calling Side server O-AS for called subscriber UE-B, and this INVITE is sent to MGCF, call out to detect the state of called subscriber UE-B according to this INVITE.If called subscriber UE-B for this INVITE request still return to failure response message or called subscriber UE-B and never have off-hook and answer, Calling Side server O-AS can restart call attempt timer again, create new INVITE, initiate new calling, until the calling that Calling Side server O-AS initiates is successfully processed.

Step S625 ~ step S630: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to MGCF.If the now called subscriber UE-B free time, called subscriber UE-B ring, MGCF returns 180(ring) response message.

Step S631～step S633: the called subscriber UE-B off-hook that is positioned at other territories.

Step S634 ~ step S637: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S638 ~ step S641: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S642～step S643: calling subscriber UE-A off-hook.

Step S644～step S645: Calling Side server O-AS discharges the playback resource of MRF.

Step S646～step S655: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S656: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention six, method is for realizing the CCNR business under networking between IMS territory, and now calling subscriber UE-A and called subscriber UE-B access respectively in different IMS core networks.

Method described in the embodiment of the present invention six, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize nonreply callback CCNR, greatly reduces thus the difficulty of nonreply callback CCNR service deployment.

Embodiment seven:

The method that the embodiment of the present invention seven provides is for realizing the CCNR business under many AS series connection networkings in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNR business.

With reference to Fig. 7, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention seven.In embodiment seven, calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

As shown in Figure 7, described method can comprise the following steps:

Step S701 ~ step S707: calling subscriber UE-A initiates call and invites, sends INVITE to called subscriber UE-B.Now, this INVITE has successively passed through Calling Side server O-AS, other AS and tri-servers of callee side server T-AS.

Step S708 ~ step S714: called subscriber UE-B ring, return 180 response messages.

Step S715 ~ step S721: Calling Side server O-AS nonreply timer expiry, Calling Side server O-AS judges whether to activate CCNR business, if can, prompting calling subscriber UE-A activates CCNR business.Described Calling Side server O-AS receives that calling subscriber UE-A activates after the instruction of CCNR, starts call attempt timer.

Step S722～step S736: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send new INVITE to called subscriber UE-B.Called subscriber UE-B ring, return 180 response messages, but called subscriber UE-B does not still have off-hook to answer.

It should be noted that, in the embodiment of the present invention, when after call attempt timer expiry, create new initial INVITE message by Calling Side server O-AS for called subscriber UE-B, and this INVITE is sent to callee side server T-AS, call out to detect the state of called subscriber UE-B according to this INVITE.If called subscriber UE-B for this INVITE request still return to failure response message or called subscriber UE-B and never have off-hook and answer, Calling Side server O-AS can restart call attempt timer again, create new INVITE, initiate new calling, until the calling that Calling Side server O-AS initiates is successfully processed.

Step S737 ~ step S746: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180 response messages.

Step S747 ~ step S751: called subscriber UE-B off-hook.

Step S752 ~ step S755: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S756～step S759: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S760～step S761: calling subscriber UE-A off-hook.

Step S762～step S763: Calling Side server O-AS discharges the playback resource of MRF.

Step S764～step S777: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S778: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention seven, method is for realizing the CCBS business under many AS series connection networkings in IMS territory, and now calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

Method described in the embodiment of the present invention seven, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize nonreply callback CCNR business, greatly reduces thus the difficulty of nonreply callback CCNR service deployment.

Embodiment eight:

The method that the embodiment of the present invention eight provides is for realizing the CCNL business under networking in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNL business.

With reference to Fig. 8, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention eight.In embodiment eight, calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

As shown in Figure 8, described method can comprise the following steps:

Step S801 ~ step S805: calling subscriber UE-A initiates call and invites, sends INVITE to called subscriber UE-B.

Step S806 ~ step S812: callee side server T-AS receives 480(user's off-line that called subscriber UE-B returns) when response message, described 480 response messages are sent to Calling Side server O-AS; Described Calling Side server O-AS judges whether to activate CCNL business, if can, prompting calling subscriber UE-A activates CCNL business; Described Calling Side server O-AS receives after the instruction of calling subscriber UE-A activation CCNL, starts call attempt timer.

Step S813～step S818: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to called subscriber UE-B.If now still off-line of called subscriber UE-B, returns 480 response messages again.

Step S819 ~ step S824: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180(ring) response message.

Step S825～step S828: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S829～step S831: called subscriber UE-B off-hook.

Step S832～step S835: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S836～step S837: calling subscriber UE-A off-hook.

Step S838～step S839: Calling Side server O-AS discharges the playback resource of MRF.

Step S840～step S849: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S850: after heavily consulting successfully, calling subscriber UE-A and called subscriber UE-B set up call.

Described in the embodiment of the present invention eight, method is for realizing the CCNL business under networking in IMS territory, and now calling subscriber UE-A and called subscriber UE-B are all that access is in same IMS core network.

Method described in the embodiment of the present invention eight, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize off-line callback CCNL business, greatly reduces thus the difficulty of off-line callback CCNL service deployment.

Embodiment nine:

The method that the embodiment of the present invention nine provides is for realizing the CCNL business under networking between IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNL business.

With reference to Fig. 9, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention nine.In embodiment nine, calling subscriber UE-A accesses in IMS core network, and called subscriber UE-B does not access in IMS core network.

As shown in Figure 9, described method can comprise the following steps:

Step S901 ~ step S905: calling subscriber UE-A initiates call and invites, sends INVITE to MGCF, is routed the call to the called subscriber UE-B that is positioned at other territories by MGCF.

When step S906 ~ step S912:MGCF receives 480 response message that called subscriber UE-B returns, described 480 response messages are sent to Calling Side server O-AS; Described Calling Side server O-AS judges whether to activate CCNL business, if can, prompting calling subscriber UE-A activates CCNL business; Described Calling Side server O-AS receives after the instruction of calling subscriber UE-A activation CCNL, starts call attempt timer.

Step S913～step S918: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send INVITE to MGCF, MGCF routes the call to the called subscriber UE-B that is positioned at other territories.If now still off-line of called subscriber UE-B, MGCF returns 480 response messages again.

Step S919 ~ step S924: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to MGCF.If the now called subscriber UE-B free time, called subscriber UE-B ring, MGCF returns 180(ring) response message.

Step S925～step S928: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S929～step S931: the called subscriber UE-B off-hook that is positioned at other territories.

Step S932～step S935: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S936～step S937: calling subscriber UE-A off-hook.

Step S938～step S939: Calling Side server O-AS discharges the playback resource of MRF.

Step S940～step S949: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S950: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention nine, method is for realizing the CCNL business under networking between IMS territory, and now calling subscriber UE-A and called subscriber UE-B access respectively in different IMS core networks.

Method described in the embodiment of the present invention nine, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize off-line callback CCNL business, greatly reduces thus the difficulty of off-line callback CCNL service deployment.

Embodiment ten:

The method that the embodiment of the present invention ten provides is for realizing the CCNL business under many AS series connection networkings in IMS territory.The method only needs Calling Side AS to support call back service, in the situation that does not need other network elements to coordinate, just can realize CCNL business.

With reference to Figure 10, the signaling process figure of the method that realizes call back service providing for the embodiment of the present invention ten.In embodiment ten, calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

As shown in figure 10, described method can comprise the following steps:

Step S1001 ~ step S1007: calling subscriber UE-A initiates call and invites, sends INVITE to called subscriber UE-B.Now, this INVITE has successively passed through Calling Side server O-AS, other AS and tri-servers of callee side server T-AS.

Step S1008 ~ step S1016: callee side server T-AS receives 480 response messages that called subscriber UE-B returns, by 480 response messages other AS that sent to Calling Side server O-AS(passage in transit).Calling Side server O-AS judges whether to activate CCNL business, if can, prompting calling subscriber UE-A activates CCNL.Described Calling Side server O-AS receives that calling subscriber UE-A activates after the instruction of CCNL, starts call attempt and starts timer.

Step S1017～step S1026: after described call attempt timer expiry, Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), send new INVITE to called subscriber UE-B.If now still off-line of called subscriber UE-B, returns 480 failure response message again.

Step S1027 ~ step S1036: Calling Side server O-AS starts described call attempt timer again, in the time of call attempt arrival interval time (being call attempt timer expiry), Calling Side server O-AS be checked through calling subscriber UE-A in idle condition (if calling subscriber UE-A is busy, restart call attempt timer), again send INVITE to called subscriber UE-B.If the now called subscriber UE-B free time, called subscriber UE-B ring, returns 180 response messages.

Step S1037～step S1040: Calling Side server O-AS sends INVITE to calling subscriber UE-A.Calling subscriber UE-A ring, returns 180 response messages.

Step S1041～step S1045: called subscriber UE-B off-hook.

Step S1046～step S1049: Calling Side server O-AS applies for putting call proceeding prompt tone to called subscriber UE-B to MRF.

Step S1050～step S1051: calling subscriber UE-A off-hook.

Step S1052～step S1053: Calling Side server O-AS discharges the playback resource of MRF.

Step S1054～step S1065: Calling Side server O-AS sends INVITE to called subscriber UE-B, calling subscriber UE-A and carries out media re-negotiation.

Step S1066: after heavily consulting successfully, calling subscriber UE-A sets up call with the called subscriber UE-B that is positioned at other territories.

Described in the embodiment of the present invention ten, method is for realizing the CCNL business under many AS series connection networkings in IMS territory, and now calling subscriber UE-A and called subscriber UE-B access in same IMS core network.

Method described in the embodiment of the present invention ten, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize off-line callback CCNL business, greatly reduces thus the difficulty of off-line callback CCNL service deployment.

Under the IP Multimedia System IMS providing corresponding to the embodiment of the present invention, Calling Side server is realized the method for call back service, and the embodiment of the present invention also provides a kind of Calling Side server.

With reference to Figure 11, it is the structure chart of the Calling Side server described in the embodiment of the present invention.As shown in figure 11, described server comprises: call attempt timer U10, receiving element U11, timer start unit U12, message construction unit U13, transmitting element U14, first timer are restarted unit U15, session on-unit U16.

Call attempt timer U10, for timing.

Receiving element U11, activates the instruction of calling back when busy or nonreply callback or off-line call back service for receiving calling subscriber.

Timer start unit U12, for receiving after described instruction as described receiving element U11, starts described call attempt timer U10, triggers described message construction unit U13.

Message construction unit U13, in the time reaching the timing of described call attempt timer U10 and determine described calling subscriber in idle condition, builds the session invitation message of calling out described called subscriber.

Transmitting element U14, for being sent to described called subscriber by described session invitation message.

Described receiving element U11, the session invitation response message of returning for receiving described called subscriber.

First timer is restarted unit U15, if for described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer U10, trigger described message construction unit U13.

Session on-unit U16, if for described in the session invitation response message returned show that described called subscriber can connect, and connects calling subscriber and called subscriber.

Calling Side server described in the embodiment of the present invention, adopt the mode of timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, greatly reduce thus the difficulty of calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL service deployment.

It should be noted that, the described session invitation response message of returning shows that described called subscriber still cannot connect and be specially: in the time that described receiving element U11 receives calling subscriber and activates the instruction of call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition; Or, in the time that described receiving element U11 receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state; Or, in the time that described receiving element U11 receives calling subscriber and activates the instruction of off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

The described session invitation response message of returning shows that described called subscriber can connect and is specially: in the time that described receiving element receives calling subscriber and activates the instruction of calling back when busy or off-line call back service, described in the session invitation response message returned be the message of described called subscriber's ring; Or, in the time that described receiving element receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber's off-hook.

Further, described server can also comprise: number of call attempts setup unit and number of call attempts judging unit.

Described number of call attempts setup unit, before starting described call attempt timer U10 at described timer start unit U12, setting current number of call attempts is 1.

Described number of call attempts judging unit, for restarting at described first timer before unit U15 restarts described call attempt timer U10, judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, trigger described first timer and restart unit U15; If not, winding-up flow process.

Further, described server can also comprise: memory cell, before starting described call attempt timer U10 at described timer start unit U12, preserve described called subscriber's number information.

Now, the described called subscriber's that described message construction unit U13 preserves according to described memory cell number information builds described session invitation message.

It should be noted that, described session invitation message comprises mark, and described mark is initiated by described Calling Side server for showing described calling.Concrete, described in be designated third party call control 3PCC mark.

Further, described server can also comprise: wait for start unit and call attempt wait unit.

Described wait start unit, in the time reaching the timing of described call attempt timer U10 and determine described calling subscriber in busy state, triggers call attempt and waits for unit.

Described call attempt is waited for unit, for restarting described call attempt timer U10, reaches after the timing of described call attempt timer, rejudges described calling subscriber's state, waits for unit if calling subscriber in busy state, triggers described call attempt; Otherwise, trigger described message construction unit U13.

Further, described wait start unit, also, in the time triggering described call attempt wait unit, setting current wait number of times is 1.Now, described server can also comprise: number of call attempts judging unit, before waiting for that at described call attempt unit restarts described call attempt timer U10, judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, trigger described call attempt and wait for unit; If not, winding-up flow process.

Further, described receiving element U11, also for receiving the message of described called subscriber in busy or nonreply or off-line state.

Now, described server also comprises business judging unit, for judging whether described calling subscriber supports described calling back when busy or nonreply callback or off-line call back service.

Described transmitting element U14, also, for when the judged result of described business judging unit is when being, sends information to described calling subscriber; Described information is used for pointing out described calling subscriber to activate described calling back when busy or nonreply callback or off-line call back service.

It should be noted that the Calling Side server that the embodiment of the present invention provides is applicable to described calling subscriber and the described called subscriber scene in networking in IP Multimedia System IMS territory; Or, described calling subscriber and the described called subscriber scene in networking between IMS territory; Or, the scene in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

Calling Side server described in the embodiment of the present invention, when calling subscriber calls out called subscriber, run into called subscriber in the time that busy or nonreply or off-line state cause non-answered call, if calling subscriber activates calling back when busy or nonreply callback or off-line call back service, Calling Side startup of server call attempt timer, definite described calling subscriber during in idle condition, Calling Side server at regular intervals section just builds the session invitation message of calling out called subscriber, be initiated to described called subscriber's calling, until called subscriber's free time, and reply corresponding ring response, reinforming calling subscriber answers, thereby set up the call between calling subscriber and called subscriber.

In the embodiment of the present invention, in the message that the called subscriber that Calling Side server receives returns, do not need to carry any information about whether supporting call back service, just can realize callback class business.Meanwhile, when called subscriber returns after the message of ring, Calling Side server is just initiated the calling to calling subscriber, waits for to called subscriber's playback prompting simultaneously, and user's business experience is promoted to some extent.

Further, in the embodiment of the present invention, for avoid occurring that call attempt all unsuccessfully causes business to be absorbed in the phenomenon of endless loop always, set a current number of call attempts number of times, after each call attempt finishes, described current number of call attempts adds 1, after described current number of call attempts reaches default maximum number of call attempts, stop making a call to called subscriber, terminated call flow process.In actual applications, described default maximum number of call attempts can be by Calling Side server O-AS flexible configuration.Such as, can set described maximum number of call attempts is 10 times.

Method and the Calling Side server of above Calling Side server under a kind of IP Multimedia System IMS provided by the present invention being realized to call back service are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.

As shown in figure 12, the another kind providing for the embodiment of the present invention is realized the equipment structure chart of the method for call back service, adopts general-purpose computing system structure, the specifically computer based on processor of computer system.As shown in figure 12, the equipment of the described method that realizes call back service comprises at least one processor 1201, communication bus 1202, memory 1203 and at least one communication interface 1204.

Processor can be a general central processing unit (CPU), microprocessor, ASIC(Application Specific Integrated Circuit) (application-specific integrated circuit, ASIC), or one or more integrated circuit of carrying out for controlling the present invention program's program.

Wherein, described communication bus 1202 can comprise a path, transmission information between said modules.Described communication interface 704, is used the device of any transceiver one class, for in case with other equipment or communication, as Ethernet, wireless access network (RAN), WLAN (wireless local area network) (WLAN) etc.

Computer system also comprises one or more memories, can be read-only memory (read-only memory, ROM) maybe can store the static storage device of the other types of static information and instruction, random access memory (random access memory, or can store the dynamic memory of the other types of information and instruction RAM), also can be EEPROM (Electrically Erasable Programmable Read Only Memo) (Electrically Erasable Programmable Read-Only Memory, EEPROM), read-only optical disc (Compact Disc Read-Only Memory, or other optical disc storage CD-ROM), laser disc storage (comprises compression laser disc, laser dish, laser disc, digital universal laser disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus, or can be used in carry or store the expectation with instruction or data structure form program code and can be by any other medium of computer access, but be not limited to this.These memories are connected with processor by bus.

Wherein, described memory 1203 is for storing the program code of carrying out the present invention program, and the program code of carrying out the present invention program is kept in memory, and controls execution by processor.These program codes specifically can comprise: call attempt timer 1210, receiving element 1211, timer start unit 1212, message construction unit 1213, transmitting element 1214, first timer are restarted unit 1215, session on-unit 1216; Described processor 1201, for carrying out the unit of described memory 1203 storages, in the time that said units is carried out by described processor 1201, is achieved as follows function:

Call attempt timer 1210, for timing.

Receiving element 1211, activates the instruction of calling back when busy or nonreply callback or off-line call back service for receiving calling subscriber.

Timer start unit 1212, for receiving after described instruction when described receiving element 1211, starts described call attempt timer 1210.

Message construction unit 1213, in the time reaching the timing of described call attempt timer 1210 and determine described calling subscriber in idle condition, builds the session invitation message of calling out described called subscriber.

Transmitting element 1214, for being sent to described called subscriber by described session invitation message.

Described receiving element 1211, the session invitation response message of returning for receiving described called subscriber.

First timer is restarted unit 1215, if for described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer 1210.

Session on-unit 1216, if for described in the session invitation response message returned show that described called subscriber can connect, and connects calling subscriber and called subscriber.

Optionally, described equipment can also comprise: number of call attempts setup unit and number of call attempts judging unit.

Described number of call attempts setup unit, before starting described call attempt timer 1210 at described timer start unit 1212, setting current number of call attempts is 1.

Described number of call attempts judging unit, for restarting at described first timer before unit 1215 restarts described call attempt timer 1210, judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, trigger described first timer and restart unit 1215; If not, winding-up flow process.

Optionally, described server can also comprise: memory cell, before starting described call attempt timer 1210 at described timer start unit 1212, preserve described called subscriber's number information.

Now, the described called subscriber's that described message construction unit 1213 is preserved according to described memory cell number information builds described session invitation message.

Optionally, described equipment can also comprise: wait for that start unit and call attempt wait for unit.

Described wait start unit, in the time reaching the timing of described call attempt timer 1210 and determine described calling subscriber in busy state, triggers call attempt and waits for unit.

Described call attempt is waited for unit, for restarting described call attempt timer 1210, reaches after the timing of described call attempt timer, rejudges described calling subscriber's state, waits for unit if calling subscriber in busy state, triggers described call attempt; Otherwise, trigger described message construction unit 1213.

Further, described wait start unit, also, in the time triggering described call attempt wait unit, setting current wait number of times is 1.Now, described server can also comprise: number of call attempts judging unit, before waiting for that at described call attempt unit restarts described call attempt timer 1210, judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, trigger described call attempt and wait for unit; If not, winding-up flow process.

Optionally, described receiving element 1211, also for receiving the message of described called subscriber in busy or nonreply or off-line state.

Described transmitting element 1214, also, for when the judged result of described business judging unit is when being, sends information to described calling subscriber; Described information is used for pointing out described calling subscriber to activate described calling back when busy or nonreply callback or off-line call back service.

The description of interaction flow between above-mentioned each unit in specifically can reference method embodiment, repeats no more here.

In the present embodiment, the described equipment of realizing call back service is applicable to described calling subscriber and described called subscriber scene in networking in IP Multimedia System IMS territory; Or, described calling subscriber and the described called subscriber scene in networking between IMS territory; Or, the scene in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

The equipment of realizing call back service providing by the present embodiment, adopt the mode of Calling Side server timing call attempt, whether obtain called subscriber in idle state, callee side server is detected to the processing procedure of called subscriber condition and transfer to Calling Side server, reduce the coupling between Calling Side server and callee side server, thus the range of application of broaden business.Described in the embodiment of the present invention, method only needs Calling Side server to support call back service, in the situation that does not need other network elements to coordinate, just can realize calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL business, greatly reduce thus the difficulty of calling back when busy CCBS or nonreply callback CCNR or off-line callback CCNL service deployment.

It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is and the difference of other embodiment.Especially,, for apparatus embodiments, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, the implementation of each unit concrete function is referring to the part explanation of embodiment of the method.Apparatus embodiments described above is only schematic, can or can not also wherein physically to separate as the unit of separating component explanation, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in multiple network element.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skill in the art, in the situation that not paying creative work, are appreciated that and implement.

The possible implementation that one of ordinary skill in the art will appreciate that various aspects of the present invention or various aspects can be embodied as system, method or computer program.Therefore, the possible implementation of each aspect of the present invention or various aspects can adopt complete hardware implementation example, complete implement software example (comprising firmware, resident software etc.), or the form of the embodiment of integration software and hardware aspect, is all referred to as " circuit ", " module " or " system " here.In addition, the possible implementation of each aspect of the present invention or various aspects can adopt the form of computer program, and computer program refers to the computer readable program code being stored in computer-readable medium.

Computer-readable medium can be computer-readable signal media or computer-readable recording medium.Computer-readable recording medium is including but not limited to electronics, magnetic, optics, electromagnetism, infrared or semiconductor system, equipment or device, or aforesaid appropriately combined arbitrarily, as random access memory (RAM), read-only memory (ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

Processor in computer reads the computer readable program code being stored in computer-readable medium, makes processor can carry out the function action specifying in the combination of in flow chart each step or each step; Generation is implemented in the device of the function action specifying in each piece of block diagram or each combination.

Claims

1. a method that realizes call back service, is characterized in that, described method comprises:

Described Calling Side server receives after the instruction that calling subscriber activates calling back when busy or nonreply callback or off-line call back service, starts call attempt timer, enters call attempt flow process;

Described call attempt flow process comprises the following steps:

In the time reaching the timing of described call attempt timer and determine described calling subscriber in idle condition, build the session invitation message of calling out called subscriber, be sent to described called subscriber;

Receive the session invitation response message that described called subscriber returns, if described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer, enter call attempt flow process; If described in the session invitation response message returned show that described called subscriber can connect, and connects described calling subscriber and called subscriber.

2. method according to claim 1, is characterized in that, described in the session invitation response message returned show that described called subscriber still cannot connect and be specially:

In the time that described Calling Side server receives calling subscriber and activates call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition;

Or, in the time that described Calling Side server receives calling subscriber and activates nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state;

Or, in the time that described Calling Side server receives calling subscriber and activates off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

3. method according to claim 1, is characterized in that, described in the session invitation response message returned show that described called subscriber can connect and be specially:

In the time that described Calling Side server receives calling subscriber and activates calling back when busy or off-line call back service, described in the session invitation response message returned be described called subscriber's ALERTING message;

Or, in the time that described Calling Side server receives calling subscriber and activates nonreply call back service, described in the session invitation response message returned be described called subscriber's offhook message.

4. according to the method described in claims 1 to 3 any one, it is characterized in that, at described startup call attempt timer, before entering call attempt flow process, described method also comprises: setting current number of call attempts is 1;

After the message of returning the described called subscriber of described reception, before restarting the step of call attempt timer described in execution, described method also comprises: judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, restart the step of call attempt timer described in execution; If not, winding-up flow process.

5. according to the method described in claims 1 to 3 any one, it is characterized in that, at described startup call attempt timer, before entering call attempt flow process, described method also comprises: the number information of preserving described called subscriber;

The session invitation message that described structure is called out described called subscriber is specially: build the session invitation message of calling out described called subscriber according to the described called subscriber's who preserves number information.

6. method according to claim 5, is characterized in that, described session invitation message comprises third party call control 3PCC mark, and described mark is initiated by described Calling Side server for showing described calling.

7. according to the method described in claim 1 to 6 any one, it is characterized in that, described call attempt flow process also comprises: in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, enter Call Waiting flow process;

Described Call Waiting flow process comprises the following steps:

Restart call attempt timer;

Again reach after the timing of described call attempt timer, rejudge described calling subscriber's state, if calling subscriber, in busy state, enters Call Waiting flow process; Otherwise, carry out described structure and call out the step of called subscriber's session invitation message.

8. method according to claim 7, it is characterized in that, described in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, enter Call Waiting flow process before, described method also comprises: setting current wait number of times is 1;

The described state that rejudges described calling subscriber, if calling subscriber is in the time of busy state, before entering Call Waiting flow process, described method also comprises: judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, enter Call Waiting flow process; If not, winding-up flow process.

9. according to the method described in claim 1 to 8 any one, it is characterized in that, described calling subscriber and described called subscriber are in IP Multimedia System IMS territory in networking;

Or described calling subscriber and described called subscriber are between IMS territory in networking;

Or, in the networking of described calling subscriber and described called subscriber multiserver series connection in IMS territory.

10. a Calling Side server, is characterized in that, described server comprises:

Call attempt timer;

Receiving element, activates the instruction of calling back when busy or nonreply callback or off-line call back service for receiving calling subscriber;

Timer start unit, for receiving after described instruction when described receiving element, starts described call attempt timer;

Message construction unit, for reaching the timing of described call attempt timer and determining that described calling subscriber when the idle condition, builds the session invitation message of calling out described called subscriber;

Transmitting element, for being sent to described called subscriber by described session invitation message;

Described receiving element, the session invitation response message of also returning for receiving described called subscriber;

First timer is restarted unit, if for described in the session invitation response message returned show that described called subscriber still cannot connect, restart described call attempt timer, trigger described message construction unit;

Session on-unit, if for described in the session invitation response message returned show that described called subscriber can connect, and connects calling subscriber and called subscriber.

11. Calling Side servers according to claim 10, is characterized in that, described in the session invitation response message returned show that described called subscriber still cannot connect and be specially:

In the time that described receiving element receives calling subscriber and activates the instruction of call back on busy service, described in the session invitation response message returned be the message of described called subscriber in busy condition;

Or, in the time that described receiving element receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber in nonreply state;

Or, in the time that described receiving element receives calling subscriber and activates the instruction of off-line call back service, described in the session invitation response message returned be the message of described called subscriber in off-line state.

12. Calling Side servers according to claim 10, is characterized in that, described in the message returned show that described called subscriber can connect and be specially:

In the time that described receiving element receives calling subscriber and activates the instruction of calling back when busy or off-line call back service, described in the session invitation response message returned be the message of described called subscriber's ring;

Or, in the time that described receiving element receives calling subscriber and activates the instruction of nonreply call back service, described in the session invitation response message returned be the message of described called subscriber's off-hook.

13. according to claim 10 to the Calling Side server described in 12 any one, it is characterized in that, described server also comprises:

Number of call attempts setup unit, before starting described call attempt timer at described timer start unit, setting current number of call attempts is 1;

Number of call attempts judging unit, for restarting at described first timer before unit restarts described call attempt timer, judge whether described current number of call attempts is less than or equal to default maximum number of call attempts, if, described current number of call attempts is added to 1, trigger described first timer and restart unit; If not, winding-up flow process.

14. according to claim 10 to the Calling Side server described in 12 any one, it is characterized in that, described server also comprises:

Memory cell, before starting described call attempt timer at described timer start unit, preserves described called subscriber's number information;

The described called subscriber's that described message construction unit is preserved according to described memory cell number information builds described session invitation message.

15. Calling Side servers according to claim 14, is characterized in that, described session invitation message comprises third party call control 3PCC mark, and described mark is initiated by described Calling Side server for showing described calling.

16. according to claim 10 to the Calling Side server described in 15 any one, it is characterized in that, described server also comprises:

Wait for start unit, in the time reaching the timing of described call attempt timer and determine described calling subscriber in busy state, trigger call attempt wait unit;

Described call attempt is waited for unit, for restarting described call attempt timer, reaches after the timing of described call attempt timer, rejudges described calling subscriber's state, waits for unit if calling subscriber in busy state, triggers described call attempt; Otherwise, trigger described message construction unit.

17. Calling Side servers according to claim 16, is characterized in that,

Described wait start unit, also, in the time triggering described call attempt wait unit, setting current wait number of times is 1;

Described server also comprises:

Number of call attempts judging unit, before waiting for that at described call attempt unit restarts described call attempt timer, judge whether described current wait number of times is less than or equal to default maximum wait number of times, if, described current wait number of times is added to 1, trigger described call attempt and wait for unit; If not, winding-up flow process.

18. according to claim 10 to the Calling Side server described in 17 any one, it is characterized in that, described calling subscriber and described called subscriber are in IP Multimedia System IMS territory in networking;