CN100461972C - Call forwarding method, system and apparatus - Google Patents
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- CN100461972C CN100461972C CNB200710003319XA CN200710003319A CN100461972C CN 100461972 C CN100461972 C CN 100461972C CN B200710003319X A CNB200710003319X A CN B200710003319XA CN 200710003319 A CN200710003319 A CN 200710003319A CN 100461972 C CN100461972 C CN 100461972C
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Abstract
The invention discloses one call front switch method, which comprises the following steps: user belonged S-CSCF receives user as called IMS business call to set the received call set information into call requires to relative AS, wherein, the said AS receives call require from S-CSCF and to judge whether to switch the local call according to the calls; if yes, then switching the call requires to user in the set information. The invention provides one call front switch system, one belonged used servo, one service call dialogue control function part and one IMS business application servo.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of call forwarding method, system and device.
Background technology
IMS (IP Multimedia Subsystem, IP Multimedia System) is a kind of access technology that is independent of, and is used to provide the architectural framework of IP multimedia service.IMS uses SIP (Session Initiation Protocol, session initiation protocol) various types of multimedia services of creating, manage and terminate.Various types of clients can be set up IP communication end to end by IMS, and can obtain needed service quality.Except that session management, the IMS system also provides finishes the necessary function of service (for example registration, safety, charging, carrying control, roaming).We can say that IMS provides the basis of integrated services, it supports speech, data and multimedia service and new application simultaneously.Except being the core with SIP, another important feature of IMS is the extensive adaptability to various access technologies, present 3GPP (3rd Generation PartnershipProject, 3G (Third Generation) Moblie standardization body) IMS of Ti Chuing can support the mobile access way of 2G and 3G, because the independence of IMS and access technology, 3GPP and TISPAN, standardization bodies such as ITU-T all expand the ability of IMS in research, to support to comprise the multiple access technology of fixed network, performance IMS is based on the effect of the general-purpose platform of SIP session, the common core network that structure fixed network and mobile network merge.
See also Fig. 1, this figure is the Organization Chart of IMS, main functional entity comprises S-CSCF (the Service-Call Session Control Function that is used for session control and route service among the IMS, the service call conversation control function parts), HSS (the Home Subscriber Server of centralized management user contracting data, home subscriber server) and the AS (Application Server, application server) that miscellaneous service service is provided.S-CSCF links to each other with HSS by Cx interface, and S-CSCF links to each other by ISC interface with AS, and HSS links to each other by Sh interface with AS.
At present, typical services based on IMS mainly comprises: PoC (Push-to-talk over cellularservice, the push-to-talk of cellular service) professional, IM (Instant Message, instant message) professional, present business, group service and multimedia conferencing etc., wherein PoC service is mainly used in and provides both sides and instant half-duplex voice communications in many ways, instant messaging to be mainly used in the user to send at a high speed message each other.
At present, Call Forwarding mainly comprises following several types, is illustrated respectively below:
1) Call Forwarding on mobile subscriber Not Reachable, when user terminal shutdown, Radio Link is congested or user terminal when exceeding the overlay area, the incoming call of this user terminal of all-calls is all before gone on another number that sets in advance.
2) divert when busy, when user terminal was conversed, other calling meetings of squeezing into went on another number that sets in advance before automatically.
3) Call Forwarding No Reply, when user terminal is in open state, the call through of squeezing into but ring unanswered, incoming call can go on another number that sets in advance before automatically.
4) Call Forwarding Unconditional goes to the number of all-calls user terminal on another number that sets in advance before all.
Call Forwarding in the IMS business (PoC, IM etc.) is by providing this professional AS to realize that for example the Call Forwarding in the PoC service is by being realized by the PoC server.For each IMS business, the Call Forwarding configuration information is kept to be provided among this professional AS, and when a service call was triggered to AS and goes up, AS can determine whether carrying out and how to carry out Call Forwarding according to the Call Forwarding configuration information of preserving above.
See also Fig. 2, this figure is a flow chart of realizing Call Forwarding in the prior art in the IMS business, as seen from the figure, user terminal 1 (UE1) has been initiated a calling to user terminal 2 (UE2), because UE2 is provided with the Call Forwarding configuration information in the AS that business support is provided for it, therefore after this AS receives call request, judging that UE2 satisfies under the situation of Call Forwarding condition, decision is arrived Call Forwarding on the user terminal 3 (UE3), the S-CSCF at UE2 place sends to call request in the home network of UE3 according to the Call Forwarding indication of receiving, below is the detailed description to the specific implementation process of this Call Forwarding:
Step 1-2, UE1 make a call to UE2, and the S-CSCF of UE1 ownership sends call request (SIP INVITE) to the I-CSCF (Interrogation-Call Session Control Function inquires CSCF) of UE2 ownership;
The S-CSCF at the I-CSCF of step 3-4, UE2 ownership inquiry UE2 place from the HSS of UE2 ownership, and the information of the S-CSCF of UE2 ownership is returned to the I-CSCF of UE2 ownership;
The I-CSCF of step 5, UE2 ownership sends call request to the S-CSCF of UE2 ownership;
The S-CSCF of step 6a-6b, UE2 ownership is transmitted to the AS that business support is provided with this call request, and AS inquires UE2 and carried out the Call Forwarding setting in advance, and the current state of definite UE2 satisfies the Call Forwarding condition that is provided with;
Step 7a-7d, AS send the message of carrying out Call Forwarding to UE1;
Step 8, AS insert the sign of the forwarding subscriber UE3 that UE2 is provided with in the call request, this call request are sent to the S-CSCF of UE2 ownership;
The call request that was modified that the S-CSCF of step 9, UE2 ownership will receive sends on the I-CSCF of UE3 ownership;
The S-CSCF of the I-CSCF of step 10-11, UE3 ownership inquiry UE3 ownership from the HSS of UE3 ownership, and the information of the S-CSCF at UE3 place is returned to the I-CSCF of UE3 ownership;
The I-CSCF of step 12a-12b, UE3 ownership sends to UE3 with call request by its S-CSCF;
After step 13a-13h, UE3 receive call request, agree to receive this and call out, and return the response message that a session is carried out to UE1;
Set up session between step 14, UE1 and the UE3.
IMS calls out and is divided into IMS ordinary call and IMS service call, and wherein the IMS ordinary call need not corresponding AS support, can finish in the IMS network, and the IMS service call need be finished under the support that this professional AS is provided.In the prior art, the Call Forwarding configuration information of IMS ordinary call class is stored on the HSS, and the Call Forwarding configuration information of IMS business is to be stored in to provide on this professional AS, because the Call Forwarding configuration information of IMS business and the Call Forwarding configuration information memory location of ordinary call class are inconsistent, therefore are unfavorable for the Call Forwarding configuration information is carried out unified management and maintenance; And owing to being stored on its corresponding AS that the Call Forwarding configuration information of each IMS business is disperseed, the Call Forwarding that different AS provides is provided with interface may be different, every new new business of releasing, just need service server to provide a new Call Forwarding that interface is set, thereby increased the complexity of system.
Summary of the invention
The embodiment of the invention provides call forwarding method, system and device, in order to being stored on its corresponding AS that the Call Forwarding configuration information that solves IMS business different in the prior art is disperseed, be unfavorable for the Call Forwarding configuration information is carried out the problem of unified management and maintenance.
The embodiment of the invention provides a kind of call forwarding method, comprises step:
When user's home service CSCF parts S-CSCF receives with this user to called IMS service call request, the Call Forwarding configuration information of the corresponding described calling that gets access to added to sending to application corresponding server A S in the call request; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF; Described AS receives the call request that S-CSCF sends, and judges whether needs with this Call Forwarding according to the Call Forwarding configuration information of wherein carrying, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information.
The embodiment of the invention provides a kind of Call Forwarding system, comprising:
S-CSCF is used to obtain user's Call Forwarding configuration information, and when receiving with described user to called IMS service call request, the Call Forwarding configuration information of the corresponding described calling of this locality storage is added to sending to corresponding AS in the call request; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF;
AS, be used to receive the call request that S-CSCF sends, judge whether that according to the Call Forwarding configuration information of wherein carrying needs are with this Call Forwarding, if, then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information, otherwise, described call request is sent to described user.
The embodiment of the invention provides a kind of service call conversation control function parts, comprising: the Redirection Information acquisition module is used for obtaining from HSS user's Call Forwarding configuration information; Call processing module is used for when receiving with described user to called IMS service call request, and the Call Forwarding configuration information of this calling of correspondence that the Redirection Information acquisition module is obtained is added to and sent to corresponding AS in the call request.
The embodiment of the invention provides a kind of IMS service application service device, comprising: the call request receiver module is used to receive the call request that S-CSCF sends; Parsing module, dissection process is carried out in the call request that is used for the call request receiver module is received, and parses to call for the Call Forwarding configuration information of carrying in asking; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF;
Judge module, the Call Forwarding configuration information that is used for parsing according to parsing module judges whether needs with this Call Forwarding, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information, otherwise, described call request is sent to described user.
In the embodiment of the invention, the Call Forwarding configuration information of IMS business is stored among the HSS, the S-CSCF of user attaching obtains user's Call Forwarding configuration information from HSS, and in the calling procedure of IMS business, the Call Forwarding configuration information is sent to corresponding AS, by AS Call Forwarding is handled, carry out storage and uniform by Call Forwarding configuration information, the Call Forwarding configuration information of IMS business is carried out maintenance and management thereby made things convenient for to the different IMS business; Further, because the Call Forwarding configuration information is carried out storage and uniform, thus when being provided, new business do not need AS to provide new interface to supply the Call Forwarding setting again.
Description of drawings
Fig. 1 is the Organization Chart of IMS;
Fig. 2 is a flow chart of realizing Call Forwarding in the prior art in the IMS business;
Fig. 3 is the flow chart of call forwarding method in the embodiment of the invention;
Fig. 4 is the flow chart of call forwarding method example one in the embodiment of the invention;
Fig. 5 is the flow chart of call forwarding method example two in the embodiment of the invention;
Fig. 6 is the structured flowchart of service call conversation control function parts in the embodiment of the invention;
Fig. 7 is the structured flowchart of IMS service application service device in the embodiment of the invention.
Embodiment
The embodiment of the invention is by doing storage and uniform and management to the Call Forwarding setting of different IMS business, and in the calling procedure of IMS business, the Call Forwarding configuration information is sent to corresponding AS, by AS Call Forwarding is handled, thereby solved being stored on its corresponding AS that the Call Forwarding configuration information of different IMS business is disperseed in the prior art, be unfavorable for the Call Forwarding configuration information is carried out the problem of unified management and maintenance.
See also Fig. 3, this figure is the flow chart of call forwarding method in the embodiment of the invention, and its main implementation procedure is:
When the S-CSCF of step 21, user attaching receives with this user to called IMS service call request, the type of service of judging this call request by the service identification parameter in the call request (for example, the parameter of PoC service is arranged in the Contact header field of call request, if carry+the g.poc.talkburst parameter in the Contact header field, show that then this call request belongs to PoC service), according to this type of service search local preserve at described the user's and with the corresponding Call Forwarding configuration information of this business.
Described Call Forwarding configuration information is obtained from the HSS of user attaching by the S-CSCF of user attaching.The user can utilize terminal equipment will send at the Call Forwarding configuration information of IMS business among the HSS of network side and store, and is that index is preserved in the professional and corresponding Call Forwarding configuration information of IMS described in the HSS with described user's URI.
If described user successfully registration in IMS, then the S-CSCF of user attaching adopts the mode of Pull (initiatively obtaining) to obtain from the HSS of user attaching and this user-dependent user's service document (service profile) by Cx interface after user registration success, has wherein comprised this user's Call Forwarding configuration information.Preferable, after the S-CSCF of user attaching obtains user's service document, if HSS detects user's service document (the Call Forwarding configuration information that has wherein comprised this user) of this user of self storage be modified after, the mode that can adopt Push (initiatively issue) by Cx interface sends to described user's ownership S-CSCF with amended user's service document, upgrades user's service document of the described user who stores among this S-CSCF with this.
If described user does not register in IMS, then when the I-CSCF of user attaching receives with this user to called IMS service call request, the I-CSCF of user attaching is that described user distributes interim ownership S-CSCF, user's interim ownership S-CSCF obtains from this user's HSS and this user-dependent user's service document (service profile), has wherein comprised this user's Call Forwarding configuration information.
The URI (Uniform resourceidentifier, unified resource sign) and the preceding commentaries on classics type identification that must comprise forwarding subscriber in the described Call Forwarding configuration information are if change the number of times thresholding before the user is provided with.Change number of times and the preceding number of times threshold information that changes before also need comprising in the then described Call Forwarding configuration information.
The S-CSCF of step 22, user attaching carries out business according to described type of service to be triggered, and determines the AS that this calling is corresponding.
The S-CSCF of step 23, user attaching adds the Call Forwarding configuration information in the call request to, sends it to this and calls out corresponding AS.
The call request that the S-CSCF of step 24, AS reception user attaching sends, determine the type of changeing before this according to the preceding commentaries on classics type identification that carries in the Call Forwarding configuration information, if the type of changeing before this is a conditional forwarding, then execution in step 25, if the type of changeing before this is a Call Forwarding Unconditional, then execution in step 26.
Whether step 26, AS judge changes number of times less than the call forward time thresholding before the ticket call in the described Call Forwarding configuration information, if, execution in step 27, otherwise, execution in step 29.
Further specified below by the implementation procedure of two concrete examples call forwarding method in the embodiment of the invention, wherein example one is the implementation procedure of unconditioned call connection in the PoC service, and example two is the implementation procedure of user's divert when busy in the PoC service.
See also Fig. 4, this figure is the flow chart of call forwarding method example one in the embodiment of the invention, and its main implementation procedure is:
Step 31, calling subscriber are initiated the call request of a PoC service to called subscriber's I-CSCF, wherein, the type of this calling from the parameter of the contact header field of call request as can be seen.
Step 32, called subscriber's I-CSCF is by the positional information of Cx interface to the S-CSCF of HSS inquiry called subscriber ownership.
Step 33, called subscriber's I-CSCF sends call request according to the Query Result that step 32 obtains to the S-CSCF of called subscriber's ownership.
After the S-CSCF of step 34, called subscriber's ownership receives call request, according to the type of service of this calling search local preserve at the called subscriber's and with the corresponding Call Forwarding configuration information of PoC service, and carry out PoC service and trigger, the Call Forwarding configuration information that finds is added in the call request.
The S-CSCF of step 35, called subscriber's ownership sends to the AS that PoC service is provided for the called subscriber by ISC interface with the call request of having added the Call Forwarding configuration information.
Step 36, for after the called subscriber provides the AS of PoC service to receive call request, extract the preceding commentaries on classics type identification that carries in the Call Forwarding configuration information, the preceding commentaries on classics type of this example is a Call Forwarding Unconditional, and change number of times in the Call Forwarding configuration information before the ticket call less than the call forward time threshold value, so AS changes to the destination address of call request the URI of the forwarding subscriber that is provided with in the Call Forwarding configuration information.
Step 37a-37c, AS send response message by called subscriber's S-CSCF, I-CSCF to the calling subscriber, and subscriber call should be called out by preceding commentaries on classics.
Step 38, AS send to amended call request called subscriber's S-CSCF.
Step 39, called subscriber's S-CSCF sends call request to forwarding subscriber.
Step 40, calling subscriber and forwarding subscriber are set up PoC session.
See also Fig. 5, this figure is the flow chart of call forwarding method example two in the embodiment of the invention, and its main implementation procedure is:
Step 51, calling subscriber are initiated the call request of a PoC service to called subscriber's I-CSCF, and wherein, this calling is a PoC call business as can be seen from the parameter of the contact header field of call request.
Step 52, called subscriber's I-CSCF is by the positional information of Cx interface to the S-CSCF of HSS inquiry called subscriber ownership.
Step 53, I-CSCF send call request according to the Query Result in the step 52 to the S-CSCF of called ownership;
After the S-CSCF of step 54, called subscriber's ownership receives call request, carrying out business triggers, according to the type of service of this calling search local preserve at the called subscriber's and with the corresponding Call Forwarding configuration information of PoC service, and carry out PoC service and trigger, the Call Forwarding configuration information that finds is added in the call request.
The S-CSCF of step 55, called subscriber's ownership sends to the AS that PoC service is provided for the called subscriber with the call request of having added the Call Forwarding configuration information by ISC interface.
After step 56, AS receive call request, extract the preceding commentaries on classics type identification that carries in the Call Forwarding configuration information, preceding commentaries on classics type in this example is divert when busy, and change number of times in the Call Forwarding configuration information before the ticket call less than the call forward time threshold value, therefore the current state of AS decision inquiry called subscriber sends to the S-CSCF that the called subscriber belongs to call request.
Step 57, AS send to call request the S-CSCF of called subscriber's ownership.
The S-CSCF of step 58, called subscriber's ownership sends call request to the called subscriber.
Step 59, because the called subscriber is in talking state, therefore return the state information of called subscriber busy to S-CSCF.
The S-CSCF of step 60, called subscriber's ownership returns to AS with the state information of called subscriber busy.
After step 61, AS received the state information of called subscriber busy, decision changed to the destination address of call request the URI of the forwarding subscriber that is provided with in the Call Forwarding configuration information.
Step 62a-62c, AS send response message by S-CSCF, the I-CSCF of called subscriber's ownership to the calling subscriber, and subscriber call should be called out by preceding commentaries on classics.
Step 63, AS send to amended call request the S-CSCF of called subscriber's ownership.
The S-CSCF of step 64, called subscriber's ownership sends call request to forwarding subscriber.
Step 65, calling subscriber and forwarding subscriber are set up PoC session.
Corresponding to above-mentioned call forwarding method, the embodiment of the invention further provides a kind of Call Forwarding system, a kind of service call conversation control function parts and a kind of IMS service application service device.
The Call Forwarding system mainly comprises in the embodiment of the invention:
HSS is used to store user's the Call Forwarding configuration information at the IMS business;
S-CSCF, be used for obtaining user's Call Forwarding configuration information from HSS, and when receiving with described user, the Call Forwarding configuration information of this calling of correspondence of this locality storage added to sending to corresponding AS in the call request to called IMS service call request;
AS, be used to receive the call request that S-CSCF sends, judge whether that according to the Call Forwarding configuration information of wherein carrying needs are with this Call Forwarding, if, then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information, otherwise, described call request is sent to described user.
See also Fig. 6, this figure is the structured flowchart of service call conversation control function parts in the embodiment of the invention, and it mainly comprises:
The Redirection Information acquisition module is used for obtaining from HSS user's Call Forwarding configuration information;
Call processing module is used for when receiving with described user to called IMS service call request, and the Call Forwarding configuration information of this calling of correspondence that the Redirection Information acquisition module is obtained is added to and sent to corresponding AS in the call request.
See also Fig. 7, this figure is the structured flowchart of IMS service application service device in the embodiment of the invention, and it mainly comprises:
The call request receiver module is used to receive the call request that S-CSCF sends;
Parsing module, dissection process is carried out in the call request that is used for the call request receiver module is received, and parses to call for the Call Forwarding configuration information of carrying in asking;
Judge module, the Call Forwarding configuration information that is used for parsing according to parsing module judges whether needs with this Call Forwarding, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information, otherwise, described call request is sent to described user.
In the embodiment of the invention, the Call Forwarding configuration information of IMS business is stored among the HSS, the S-CSCF of user attaching obtains user's Call Forwarding configuration information from HSS, and in the calling procedure of IMS business, the Call Forwarding configuration information is sent to corresponding AS, by AS Call Forwarding is handled, carry out storage and uniform by Call Forwarding configuration information, the Call Forwarding configuration information of IMS business is carried out maintenance and management thereby made things convenient for to the different IMS business; Further, because the Call Forwarding configuration information is carried out storage and uniform, thus when being provided, new business do not need AS to provide new interface to supply the Call Forwarding setting again.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. a call forwarding method is characterized in that, comprises step:
When user's home service CSCF parts S-CSCF receives with this user to called IMS service call request, the Call Forwarding configuration information of the corresponding described calling that gets access to added to sending to application corresponding server A S in the call request; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF;
Described AS receives the call request that S-CSCF sends, and judges whether needs with this Call Forwarding according to the Call Forwarding configuration information of wherein carrying, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information.
2. the method for claim 1 is characterized in that, described user registers in IMS, and described Call Forwarding configuration information is obtained from user's HSS after described user registration success by S-CSCF.
3. method as claimed in claim 2 is characterized in that, user's HSS sends to amended Call Forwarding configuration information described user's ownership S-CSCF after the Call Forwarding configuration information that detects the described user who self stores is modified.
4. the method for claim 1, it is characterized in that, described user does not register in IMS, described Call Forwarding configuration information is obtained from this user's HSS by the interim ownership S-CSCF of user, and the interim ownership S-CSCF of user is that described user distributes by the I-CSCF of user attaching when receiving with this user to called IMS service call request.
5. the method for claim 1 is characterized in that, described AS judges whether that according to the Call Forwarding configuration information needs with the detailed process of this Call Forwarding are:
Determine this preceding commentaries on classics type according to the preceding commentaries on classics type identification that carries in the described Call Forwarding configuration information;
If this preceding commentaries on classics type is a Call Forwarding Unconditional, and judges the current state of described user and satisfy the Call Forwarding condition, then described call request is sent to described user;
Otherwise, further judge and whether change number of times in the described Call Forwarding configuration information before the ticket call less than the call forward time thresholding; If change number of times before the ticket call less than described thresholding, add one with changeing number of times before the ticket call in the described Call Forwarding configuration information, and call request sent to the forwarding subscriber that is provided with in the Call Forwarding configuration information, if change before the ticket call number of times greater than, equal described thresholding, stop this calling.
6. a Call Forwarding system is characterized in that, comprising:
S-CSCF is used to obtain user's Call Forwarding configuration information, and when receiving with described user to called IMS service call request, the Call Forwarding configuration information of the corresponding described calling of this locality storage is added to sending to corresponding AS in the call request; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF;
AS is used to receive the call request that S-CSCF sends, and judges whether needs with this Call Forwarding according to the Call Forwarding configuration information of wherein carrying, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information.
7. system as claimed in claim 6 is characterized in that, also comprises:
HSS is used to store user's the Call Forwarding configuration information at the IMS business, and offers S-CSCF.
8. service call conversation control function parts is characterized in that, comprising:
The Redirection Information acquisition module is used for obtaining from HSS user's Call Forwarding configuration information;
Call processing module is used for when receiving with described user to called IMS service call request, and the Call Forwarding configuration information of this calling of correspondence that the Redirection Information acquisition module is obtained is added to and sent to corresponding AS in the call request.
9. an IMS service application service device is characterized in that, comprising:
The call request receiver module is used to receive the call request that S-CSCF sends;
Parsing module, dissection process is carried out in the call request that is used for the call request receiver module is received, and parses to call for the Call Forwarding configuration information of carrying in asking; Described Call Forwarding configuration information is obtained from user's home subscriber server HSS by S-CSCF;
Judge module, the Call Forwarding configuration information that is used for parsing according to parsing module judges whether needs with this Call Forwarding, if then described call request is sent to the forwarding subscriber that writes down in the Call Forwarding configuration information, otherwise, described call request is sent to described user.
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| CN101137097B (en) * | 2007-09-28 | 2011-07-20 | 中兴通讯股份有限公司 | Call late forwarding method in IP multimedia subsystem centralized service |
| CN101252706B (en) * | 2008-04-15 | 2011-08-24 | 中兴通讯股份有限公司 | Method and system for forwarding intelligent call |
| CN106454785A (en) * | 2016-12-14 | 2017-02-22 | 中国联合网络通信集团有限公司 | Call forwarding method and system |
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