CN102420802A - Method and system for accessing circuit switch domain call through visited IMS (IP Multimedia System) access point - Google Patents
Method and system for accessing circuit switch domain call through visited IMS (IP Multimedia System) access point Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1016—IP multimedia subsystem [IMS]
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- H—ELECTRICITY
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- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
- H04M7/1225—Details of core network interconnection arrangements
- H04M7/123—Details of core network interconnection arrangements where the packet-switched network is an Internet Protocol Multimedia System-type network
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- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
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Abstract
The invention discloses a method for accessing a circuit switch domain call through a visited IMS (IP Multimedia System) access point, comprising the following steps: a mobile switch center (MSC) or user equipment (UE) inquiries a service continuity and centralization application server (SCCAS) the visited IMS (IP Multimedia System) control point (VICP) information of a calling subscriber, or obtains the VICP information according to a number or an identifier of the calling subscriber, and the MSC or the UE transmits a calling message via the VICP corresponding to the VICP information. The invention also discloses a system for accessing the circuit switch domain call through the visited IMS access point, which is used for implementing the method. According to the invention, when the UE initiates a call at a CS (Circuit Switch) domain, the access capability of a visited ISM can be used, so that occupation to CS long-distance link resources is reduced to a certain extent.
Description
Technical Field
The invention relates to a technology that a Circuit Switching (CS) domain call is accessed through an IP Multimedia Subsystem (IMS) access point of a visit place, in particular to a method and a system that the Circuit switching domain call is accessed through the IMS access point of the visit place.
Background
An IP Multimedia Subsystem (IMS, IP Multimedia Core Network Subsystem) is an IP-based Network architecture proposed by the third Generation Partnership Project (3 GPP), which constructs an open and flexible service environment, supports Multimedia applications, and can provide rich Multimedia services for users.
In the IMS service system, the control layer and the service layer are separated, the control layer does not provide specific services, and only provides necessary functions of triggering, routing, charging and the like for the service layer.
The service triggering and Control functions in the Control layer are performed by a Call Session Control Function (CSCF). The call session control functions mainly include: three types of Proxy call session control function entities (P-CSCF), inquiry call session control function entities (I-CSCF), and Serving call session control function entities (S-CSCF), wherein S-CSCF functions are necessary and I-CSCF is optional.
The service layer is composed of a series of Application Servers (AS), which can provide specific service services, and the AS may be an independent entity or may exist in the S-CSCF.
And the control layer (S-CSCF) controls service triggering according to the subscription information of the user, calls the service on the AS and realizes the service function.
The end-to-end Equipment in the session is called User Equipment (UE) and is responsible for interaction with the UE User. The UE has multiple ways to access the network, including accessing the network through a Packet Switched (PS) domain of 3GPP, or accessing the network through a PS domain of other non-3 GPP, or even accessing the network through a Circuit Switched (CS) domain, and so on. When an IMS subscriber accesses and originates a call in the CS domain, its call signaling needs to be routed to the IMS domain to which the subscriber belongs, thereby providing services to the subscriber.
Fig. 1 is a flow chart of an existing IMS user at CS origination, and as shown in fig. 1, describes an application scenario in which an IMS user equipment UE-1 calls a UE-2 in a CS domain, and includes the following steps:
in step 101, UE-1 calls UE-2 in CS domain, for example, sends a SETUP (SETUP) message of CS signaling with number A of UE-2 as the called party.
Step 102, a call message arrives at a Mobile Switching Center (MSC), and the MSC requests an IMS routing number from a home Network, that is, from a Service Continuity and convergence Application Server (SCC AS), for example, sends a request message IN an Intelligent Network (IN) manner or a camel (managed Application for Mobile Network enhanced logic) manner, and carries a number a.
Step 103, the request message reaches the SCC AS, which returns the IMS routing number B, where the number B points to the SCC AS.
In step 104, the MSC redirects the call to number B, that is, the call is sent by using number B as the called party, such as an Initial Address Message (IAM) or INVITE Message for sending CS signaling.
Step 105, since the number B is the number of the home network, the CS signaling is routed to a Media Gateway Control Function (MGCF) of the home network, the MGCF translates the CS signaling into the IMS signaling and forwards the IMS signaling, and the IMS call message finally reaches the SCC AS through the route of the CSCF.
In step 106, since the number B is a redirection number allocated for the number a, the SCC AS may obtain the number a through the called number B.
In step 107, the SCC AS redirects the received call message to number a of UE-2 and forwards it.
Step 108-109, UE-2 answers the call and returns the response message of IMS, for example, sends '200 OK' message, and the message reaches MGCF through CSCF and SCC AS.
Step 110-111, MGCF translates IMS response Message into response Message of CS signaling, such as response Message (ANM) or "200 OK", and then forwards to MSC.
Step 111, MSC sends the response message to UE-1.
In this regard, a call is established between UE-1 and UE-2, wherein the CS media path is connected from the visited network of UE-1 to the home network of UE-1.
The prior art has the disadvantage that even if the visited network of the UE-1 has the IMS network access capability, the call initiated by the UE-1 in the CS domain does not use the IMS network access capability of the visited network of the UE-1, thereby occupying the long-distance link resource of the CS.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for accessing a circuit switched domain call through a visited IMS access point, which can perform call access on a call initiated in a CS domain through the visited IMS access point.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for accessing a circuit switched domain call through a visited IMS access point, comprising:
MSC or UE inquires the Visited IMS Control Point (VICP) information of the calling user from SCC AS, or obtains the VICP information according to the number or identification of the calling user; and the MSC or the UE sends a calling message through the VICP corresponding to the VICP information.
Preferably, the number of the calling party carries the VICP information, or the identification of the calling party includes the VICP information.
Preferably, the VICP information is a VICP number, and/or a VICP identifier, and/or an index for finding the VICP.
Preferably, the querying the SCC AS for the VICP information of the calling user specifically includes:
the MSC sends the number or the identification information of the calling party in an intelligent network mode or a CAMEL mode, or the MSC or the UE sends the number or the identification information of the calling party by using an IMS signaling, and after the number or the identification information of the calling party reaches the SCC AS, the SCC AS determines the VICP information of the calling party according to the number or the identification information of the calling party and returns the VICP information to the MSC or the UE.
Preferably, the querying, by the UE, the VICP information of the calling user from the SCC AS specifically includes:
the UE sends a message to the SCC AS by using IMS signaling, wherein the message passes through the VICP;
and after the message reaches the SCC AS, the SCC AS returns the information of the VICP to the UE.
Preferably, the sending, by the MSC or the UE, the call message through the VICP corresponding to the VICP information specifically includes:
the MSC or the UE sends a calling message which takes the VICP number or the identification as a target, or sends a calling message which requires to pass through the VICP;
and after receiving the call message, the VICP forwards the call message.
Preferably, after receiving the call message, the SCC AS determines that the target of the call message is the VICP, and redirects the call message by the SCC AS to use the called subscriber number or identifier.
Preferably, the VICP is an Access Transfer Control Function (ATCF), a P-CSCF, an Interworking Border Control Function (IBCF), or an MSC having an IMS Access Function.
A circuit switched domain call is through visiting the system that the place IMS cut-in inserts, including MSC, VICP and SCC AS; wherein,
the MSC is used for inquiring the VICP information of the calling user from the SCC AS, or obtaining the VICP information according to the number or the identification of the calling user, and sending a calling message through the VICP corresponding to the VICP information;
and the VICP is used for forwarding the call message.
Preferably, the system further includes a UE, configured to query the SCC AS for the VICP information of the calling user, or obtain the VICP information according to the number or the identifier of the calling user, and send a call message through the VICP corresponding to the VICP information.
Preferably, the SCC AS is configured to, after receiving the call message, redirect the call message to a called subscriber number or identifier when determining that the target of the call message is the VICP.
Preferably, the MSC further sends the number or the identification information of the calling party in an intelligent network manner or a CAMEL manner, or the MSC or the UE sends the number or the identification information of the calling party by using an IMS signaling;
after the number or identification information of the calling user reaches the SCC AS, the SCC AS further determines the VICP information of the calling user according to the number or identification information of the calling user and returns the VICP information to the MSC or the UE.
Preferably, the VICP is an ATCF, or a P-CSCF, or an IBCF, or an MSC with IMS access function.
In the invention, MSC or UE inquires the VICP information of a calling user from SCC AS, or obtains the VICP information according to the number or identification information of the calling user, and the MSC or UE sends a calling message through the VICP corresponding to the VICP information. In the invention, when the UE initiates a call in the CS domain, the access capability of the IMS of the visited place can be used, and the occupation of CS long-distance link resources is reduced to a certain extent.
Drawings
Fig. 1 is a flow chart of an existing IMS subscriber at CS origination;
fig. 2 is a flowchart of a first embodiment of a method for accessing a circuit switched domain call through a visited IMS access point according to the present invention;
fig. 3 is a flowchart of a second embodiment of the method for accessing a circuit switched domain call through a visited IMS access point according to the present invention;
fig. 4 is a flowchart of a third embodiment of a method for accessing a circuit switched domain call through a visited IMS access point according to the present invention;
fig. 5 is a flowchart of a fourth embodiment of the method for accessing a circuit switched domain call through a visited IMS access point according to the present invention.
Detailed Description
The basic idea of the invention is that MSC or UE inquires the VICP information of the calling user from SCC AS, or obtains the VICP information according to the number or identification information of the calling user, and the MSC or UE sends the calling message through the VICP corresponding to the VICP information.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
Example one
Fig. 2 is a flowchart of a first embodiment of a method for accessing a circuit switched domain call through a visited IMS access point, as shown in fig. 2, in this example, a calling user equipment is UE-1, a called user equipment is UE-2, wherein a user of UE-1 is an IMS user, a call to UE-2 is initiated through a CS domain, and an MSC does not support IMS signaling. The method for accessing the circuit switched domain call through the visited IMS access point specifically includes the following steps:
step 201, UE-1 calls UE-2 in CS domain, for example, sends SETUP message of CS signaling with number A of UE-2 as called; here, the network where the UE-1 is located is a visited network, and if the UE-1 does not roam, the visited network is the home network of the UE-1.
Step 202, a SETUP message of the call arrives at the MSC, and the MSC requests an IMS routing number from the SCC AS of the calling subscriber, for example, sends a request message requesting the IMS routing number IN an IN manner or a CAMEL manner, where the request message carries the number a of the UE-2 and the number or identifier (for example, the international mobile terminal identifier IMSI or the international mobile equipment IMEI identifier) of the UE-1.
Step 203, after receiving the request message of the IMS routing number, the SCC AS allocates an IMS routing number B for the call according to the number or identifier of the UE-1, and sends the IMS routing number B to the MSC; the number B points to the VICP.
Step 204, after receiving IMS routing number B, MSC redirects the current call to number B, that is, number B is called to send a call message to the VICP to which number B points, for example, IAM message or INVITE message of sending CS signaling to the VICP to which VICP number B points, since number B is a number pointing to the VICP, CS signaling is routed to the VICP, if the call message sent to the VICP by MSC is IAM message, the message is converted into INVITE message by MGCF, and then forwarded to the VICP to which number B points, and if the call message sent by MSC is INVITE message, it can be directly sent to the VICP to which number B points.
In step 205, the VICP sends the call message to the home network of the calling subscriber, for example, sends an INVITE message of IMS signaling, where the INVITE message targets number B.
Step 206, after the CSCF receives the call message sent by the VICP, the CSCF routes the call message to the SCC AS according to the setting of the existing protocol, and since the number B is a redirect number allocated for the number a, the SCC AS can obtain the number a and/or the called user identifier associated with the number a through the called number B according to the prior art.
Step 207, the SCC AS redirects the received call message to the number a or identity of the UE-2 according to the prior art, and forwards the received call message.
And 208-209, the UE-2 answers the call and returns an answer message of the IMS, for example, a '200 OK' message is sent, and the '200 OK' message reaches the VICP through the CSCF and the SCC AS.
In step 210, the VICP forwards the response message to the MSC, for example, sends a "200 OK" message, and if the MSC sends an IAM message, the IAM message is translated into an ANM message by the MGCF, and then sent to the MSC.
In step 211, the MSC sends the response message to the UE-1.
Therefore, the UE-1 and the UE-2 establish a call. In the invention, the CS media path is only in the visit network of the UE-1, so that CS long-distance link resources are not occupied.
Example two
Fig. 3 is a flowchart of a second embodiment of the method for accessing a circuit switched domain call through a visited IMS access point, as shown in fig. 3, in the application scenario of this example, an MSC supports IMS signaling, and number information of UE-1 includes VICP information (for example, a prefix part of a number of UE-1 can be used to index a VICP), and IMS user equipment UE-1 calls UE-2 in a CS domain. The method for accessing the circuit switched domain call through the visited IMS access point specifically includes the following steps:
before the following call processing procedure starts, the MSC may obtain the number and/or identification of the VICP according to the VICP information (e.g., the prefix part of the number information as described above) included in the number or identification (e.g., global resource identification URI) information of UE-1.
Step 301, UE-1 calls UE-2 in CS domain, for example, sending SETUP message of CS signaling with number a of UE-2 as called;
step 302, the call request arrives at the MSC, and if the MSC has not acquired the number and/or identifier of the VICP, the MSC acquires the number and/or identifier of the VICP according to the VICP information (such as the number information prefix part mentioned above) included in the number or identifier information of UE-1;
step 303, the MSC converts the call message of the CS signaling into a call message of the IMS signaling, and redirects to the VICP according to the obtained number or identifier of the VICP, for example, sends an INVITE message with the VICP number or identifier as a target, where the INVITE message carries called number a, i.e., the number of UE-2, or requires the call message to pass through the VICP, for example, adds the number or identifier of the VICP in a Route header field of the call message;
step 304-305, the VICP redirects the call to the UE-2, namely the UE-2 is used AS a target to send an INVITE message, and the call message INVITE message is routed to the CSCF and the SCC AS and finally reaches the UE-2;
step 306-308, the UE-2 answers the call, returns an answer message of the IMS, for example, sends a "200 OK" message, the "200 OK" message passes through the CSCF and the SCC AS, and is forwarded by the VICP, and finally reaches the MSC;
in step 309, the MSC sends the response message to the UE-1.
Therefore, the UE-1 and the UE-2 establish a call. In the invention, the CS media path is only in the visit network of the UE-1, so that CS long-distance link resources are not occupied.
EXAMPLE III
Fig. 4 is a flowchart of a third embodiment of a method for accessing a circuit switched domain call through a visited IMS access point, as shown in fig. 4, in this example, a calling user equipment is UE-1, a called user equipment is UE-2, wherein a user of UE-1 is an IMS user, a call to UE-2 is initiated through a CS domain, and an MSC supports IMS signaling. The method for accessing the circuit switched domain call through the visited IMS access point specifically includes the following steps:
step 401, UE-1 calls UE-2 in CS domain, for example, sends SETUP message of CS signaling with number A of UE-2 as called; here, the network where the UE-1 is located is a visited network, and if the UE-1 does not roam, the visited network is the home network of the UE-1.
Step 402, the SETUP message of the call reaches the MSC, the MSC sends the call message of the IMS to the home network of the UE-1, the call message is the number a of the UE-2, which carries the number or identifier of the UE-1, and the call message reaches the SCC AS via the CSCF.
Step 403, after receiving the call message, the SCC AS determines the VICP according to the number or identifier of the UE-1, and requests the MSC to resend the call message, so that the call message passes through the VICP, for example, a "305 UseProxy" message that sends the IMS signaling, where the message carries the number or identifier of the VICP.
In step 404, after receiving the re-sending call message, the MSC re-sends the call message and requests the call message to pass through the VICP, for example, putting the number or identifier of the VICP into the Route header field of the call message.
In step 405, the VICP sends the call message to the home network of the calling subscriber, for example, forwards the call message, and the message reaches the SCC AS via the CSCF.
At step 406, the SCC AS forwards the received call message.
Step 407-408, UE-2 answers the call and returns an answer message of IMS, for example, sends a "200 OK" message, and the "200 OK" message reaches the VICP through CSCF and SCC AS.
At step 409, the VICP forwards the reply message to the MSC, such as sending a "200 OK" message.
In step 410, the MSC sends a response message to the UE-1.
Therefore, the UE-1 and the UE-2 establish a call. In the invention, the CS media path is only in the visit network of the UE-1, so that CS long-distance link resources are not occupied.
Example four
Fig. 5 is a flowchart of a fourth embodiment of the method for accessing a circuit switched domain call through a visited IMS access point, as shown in fig. 5, in this example, a calling user equipment is UE-1, a called user equipment is UE-2, wherein the user of UE-1 is an IMS user, and a media connection with UE-2 is established through a CS domain. The method for accessing the circuit switched domain call through the visited IMS access point specifically includes the following steps:
step 501, UE-1 requests the SCC AS of the calling user in the IMS domain for the called number of the subsequent CS call, which carries the actual called number and/or identifier of the subsequent CS call, such AS an INVITE message for sending an IMS signaling; here, the network where the UE-1 is located is a visited network, and if the UE-1 does not roam, the visited network is the home network of the UE-1.
Step 502, the INVITE request message of IMS passes through the VICP (since the VICP is an IMS access point), and the VICP forwards the request message to the SCC AS of the calling user.
Step 503-step 504, after receiving the request message, the SCC AS learns that the request message passes through the VICP, and then allocates a called number B of a subsequent CS call to the call, and sends the called number B to the UE through the VICP; the number B points to the VICP, and the SCC AS may also assign a called number C for subsequent CS calls, the number C pointing to the SCCAS.
Step 505, if SCC AS performs the operation of allocating number B, UE-1 calls called number B in CS domain, such AS a SETUP message for sending CS signaling, if not, UE-1 obtains number B of VICP according to VICP information (such AS the aforementioned number information prefix part) included in the number or identifier (such AS URI) information of UE-1, and calls called number B in CS domain.
In step 506, the SETUP message for the call arrives at the MSC, which forwards the call to the VICP.
In step 507, the VICP forwards the call to the SCC AS.
In step 508, the SCC AS redirects the received call message to the number a or identity of the UE-2 according to the prior art, and forwards the received call message.
Step 509-step 510, UE-2 answers the call and returns an answer message to IMS, for example, sends a "200 OK" message, and the "200 OK" message reaches the VICP through CSCF and SCC AS.
In step 511, the VICP forwards the response message to the MSC, for example, sends a "200 OK" message, and if the MSC sends an IAM message, the IAM message is translated into an ANM message by the MGCF, and then sent to the MSC.
In step 512, the MSC sends the response message to UE-1.
Therefore, the UE-1 and the UE-2 establish a call. In the invention, the CS media path is only in the visit network of the UE-1, so that CS long-distance link resources are not occupied.
In the present invention, the VICP in the first, second, third and fourth embodiments is specifically an ATCF, or a P-CSCF, or an IBCF, or an MSC having an IMS access function.
The invention also discloses a system for accessing the circuit switching domain call through the visited IMS access point, which comprises an MSC, a VICP, a UE and an SCC AS, wherein the network elements have the following functions, are slightly different from the corresponding network elements in the existing network, and are described in detail below.
The MSC or the UE is used for inquiring the VICP information of the calling user from the SCC AS, or obtaining the VICP information according to the number or the identification information of the calling user, and sending a calling message through the VICP corresponding to the VICP information.
The VICP is used for forwarding the call message.
And the SCC AS is used for redirecting the call message to a called subscriber number or an identifier when the target of the call message is determined to be the VICP after the call message is received.
The MSC further sends the calling number or the identification information in an intelligent network mode or a CAMEL mode, or the MSC or the UE sends the calling number or the identification information by using an IMS signaling; after the calling number or the identification information reaches the SCC AS, the SCC AS further determines the VICP information of the calling user according to the calling number information and returns the VICP information to the MSC or the UE.
The VICP is ATCF, P-CSCF, IBCF or MSC with IMS access function.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (13)
1. A method for accessing a circuit switched domain call through a visited IMS access point, the method comprising:
a Mobile Switching Center (MSC) or User Equipment (UE) inquires a Service Continuity and Centralization Application Server (SCCAS) about Visited IMS Control Point (VICP) information of a calling subscriber, or obtains the VICP information according to the number or the identification of the calling subscriber; and the MSC or the UE sends a calling message through the VICP corresponding to the VICP information.
2. The method of claim 1, wherein the number of the calling party carries the VICP information, or wherein the identification of the calling party includes the VICP information.
3. The method according to claim 1 or 2, wherein the VICP information is a VICP number, and/or a VICP identifier, and/or an index for finding a VICP.
4. The method of claim 1, wherein the MSC or the UE querying the SCC AS for the VICP information of the calling subscriber specifically is:
the MSC sends the number or the identification information of the calling party in an intelligent network mode or a CAMEL mode, or the MSC or the UE sends the number or the identification information of the calling party by using an IMS signaling;
and after the number or the identification information of the calling user reaches the SCC AS, the SCC AS determines the VICP information of the calling user according to the number or the identification information of the calling user and returns the VICP information to the MSC or the UE.
5. The method of claim 1, wherein the UE querying the SCC AS for the VICP information of the calling user specifically is:
the UE sends a message to the SCC AS by using IMS signaling, wherein the message passes through the VICP;
and after the message reaches the SCC AS, the SCC AS returns the information of the VICP to the UE.
6. The method according to claim 1, wherein the sending, by the MSC or the UE, the call message through the VICP corresponding to the VICP information specifically includes:
the MSC or the UE sends a calling message which takes the VICP number or the identification as a target, or sends a calling message which requires to pass through the VICP;
and after receiving the call message, the VICP forwards the call message.
7. The method of claim 6, wherein after receiving the call message, the SCC AS redirects the call message to a called subscriber number or identity when determining that the call message is targeted to the VICP.
8. The method of claim 1, wherein the VICP is an Access Transfer Control Function (ATCF) entity, or a proxy call session control function (P-CSCF) entity, or an Interworking Border Control Function (IBCF) entity, or an MSC with IMS access functionality.
9. A system that the circuit switched domain call is accessed through IMS cut-in point of visiting place, characterized by that, including MSC, VICP and SCC AS; wherein,
the MSC is used for inquiring the VICP information of the calling user from the SCC AS, or obtaining the VICP information according to the number or the identification of the calling user, and sending a calling message through the VICP corresponding to the VICP information;
and the VICP is used for forwarding the call message.
10. The system of claim 9, further comprising a UE configured to query the SCCAS for the VICP information of the calling party, or obtain the VICP information according to the number or the identifier of the calling party, and send a call message through the VICP corresponding to the VICP information.
11. The system of claim 10, wherein the SCC AS is configured to redirect the call message to a called subscriber number or identity when determining that the call message is targeted to the VICP after receiving the call message.
12. The system according to claim 9 or 10, wherein the MSC further sends the number or identification information of the calling party through an intelligent network or CAMEL, or the MSC or UE sends the number or identification information of the calling party using IMS signaling;
after the number or identification information of the calling user reaches the SCC AS, the SCC AS further determines the VICP information of the calling user according to the number or identification information of the calling user and returns the VICP information to the MSC or the UE.
13. The system according to any of claims 9 to 12, wherein the VICP is an ATCF, or a P-CSCF, or an IBCF, or an MSC with IMS access functionality.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102956257A CN102420802A (en) | 2010-09-27 | 2010-09-27 | Method and system for accessing circuit switch domain call through visited IMS (IP Multimedia System) access point |
| PCT/CN2011/078861 WO2012041139A1 (en) | 2010-09-27 | 2011-08-24 | Method and system for circuit switch domain call to access network through the visited ims |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102956257A CN102420802A (en) | 2010-09-27 | 2010-09-27 | Method and system for accessing circuit switch domain call through visited IMS (IP Multimedia System) access point |
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| Publication Number | Publication Date |
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| CN102420802A true CN102420802A (en) | 2012-04-18 |
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| CN2010102956257A Pending CN102420802A (en) | 2010-09-27 | 2010-09-27 | Method and system for accessing circuit switch domain call through visited IMS (IP Multimedia System) access point |
Country Status (2)
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| CN (1) | CN102420802A (en) |
| WO (1) | WO2012041139A1 (en) |
Cited By (1)
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| CN102761929A (en) * | 2012-07-09 | 2012-10-31 | 中兴通讯股份有限公司 | Realizing method of IMS (IP multimedia core network subsystem) session switching and access switching control function |
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| KR101194611B1 (en) * | 2008-10-24 | 2012-10-25 | 에스케이텔레콤 주식회사 | System and method for reporting an expiry of the limited fare |
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| US20040184435A1 (en) * | 2001-06-20 | 2004-09-23 | Ilkka Westman | System, device and method for providing call forwarding in dual subscription mode |
| CN1794829A (en) * | 2005-03-25 | 2006-06-28 | 华为技术有限公司 | Method of establishing circuit exchange network to IMS network calling route |
| CN1838649A (en) * | 2005-03-25 | 2006-09-27 | 华为技术有限公司 | Building method for calling route from circuit switching network to IMS network |
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| WO2012041139A1 (en) | 2012-04-05 |
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