CN103414700B - Method and device for calling routing - Google Patents

Abstract

The present invention provides a call routing method and device, which relate to the field of communication technology, wherein the method includes: receiving a call request initiated by a user; querying an ENUM/DNS server to obtain the next call corresponding to the called number in the call request Jumping to the address information of the first-level area equipment, the address information corresponding to the IMS user and the non-IMS user is configured in the ENUM/DNS server; the call request is routed to the first-level area equipment corresponding to the address information, so that The first-level area equipment routes the call request by using the second-level area equipment corresponding to the second-level area to which the called number belongs. The technical scheme of the present invention improves call routing efficiency and reduces the burden of network element equipment on the basis of realizing intercommunication between IMS users and non-MS users.

Description

Call routing method and device

technical field

The present invention relates to the technical field of communications, in particular to a call routing method and device.

Background technique

IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) is a brand-new multimedia service form. As a technology that can realize all-IP networks, its main features are simplicity, flexibility, open standards, and independence from access networks. IMS The network can meet the needs of current end customers for more novel and diversified multimedia services, and has become the core part of the next-generation converged communication system, and it is also the evolution direction of the language exchange network.

In the future development of the IMS network, it will coexist with CS (circuit switching, circuit switching)-based telephone networks (including PLMN, GSM and other circuit switching networks) for a long period of time. Therefore, the realization of IMS network users and CS network It is very necessary for users to communicate with each other. At present, in the IMS network, it is usually necessary to determine whether the traffic involves non-IMS users. When non-IMS users are involved, the traffic is routed to the traditional network through the switching of multiple network element devices to realize traffic interworking with the traditional network. This solution is relatively Complicated, traffic routing efficiency is low, and network element equipment in the IMS network has a heavy burden.

Contents of the invention

The present invention provides a method and device for improving traffic routing efficiency. The present invention provides a call routing method, including:

receiving the call request initiated by the IMS user sent by the P-CSCF;

Query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with address information corresponding to IMS users and non-IMS users ;

Routing the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device corresponding to the second-level area to which the called number belongs to route the call request.

The present invention provides yet another call routing method, including:

Receive the call request initiated by the non-IMS user sent by the MGCF;

Query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with address information corresponding to IMS users and non-IMS users ;

Routing the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device corresponding to the second-level area to which the called number belongs to route the call request.

The present invention provides a call routing device, which includes:

The receiving module is configured to receive the call request initiated by the IMS user sent by the P-CSCF;

The query module is used to query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with IMS users and non-IMS Address information corresponding to the user;

A routing module, configured to route the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device routing corresponding to the second-level area to which the called number belongs The call request.

The present invention provides yet another call routing device, including:

A receiving module, configured to receive a call request initiated by a non-IMS user sent by the MGCF;

The query module is used to query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with IMS users and non-IMS Address information corresponding to the user;

A routing module, configured to route the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device routing corresponding to the second-level area to which the called number belongs The call request.

In the technical solution of the present invention, by configuring the address information corresponding to the IMS user and the non-IMS user in the ENUM/DNS server, it is possible to directly route the call request to the one to which the called number belongs without judging the user type of the called number. The equipment in the level area (province) improves the efficiency of call routing and reduces the burden on the network element equipment on the basis of realizing the traffic intercommunication between IMS users and IMS users.

Description of drawings

FIG. 1 is a flow chart of Embodiment 1 of the call routing method of the present invention;

FIG. 2 is a flow chart of Embodiment 2 of the call routing method of the present invention;

FIG. 3 is a flow chart of Embodiment 3 of the call routing method of the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 1 of a call routing device according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 2 of the call routing device of the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 3 of a call routing device according to the present invention.

detailed description

Fig. 1 is the flow chart of embodiment one of the call routing method of the present invention, referring to Fig. 1, the method of this embodiment includes:

Step 101: Receive a call request initiated by an IMS user sent by a P-CSCF;

CSCF (Call Session Control Function; Call Session Control Function) is an internal functional entity of IMS (IP Multimedia Subsystem; IP Multimedia Subsystem), and is the core of the entire IMS network. According to functions, it is divided into P-CSCF (Proxy CSCF; proxy CSCF), I-CSCF (Interrogating CSCF; Query CSCF), S-CSCF (Serving CSCF; Serving CSCF), etc.

The method in this embodiment is executed by the S-CSCF to which the calling IMS user belongs. The entry point for users to visit the network. All session messages initiated and terminated by IMS user terminals must pass through P-CSCF. In this embodiment, a secondary area corresponds to an S-CSCF. Calls initiated by IMS user terminals The request is routed to the S-CSCF of the secondary area to which the user belongs through the P-CSCF. Step 102: Query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with correspondence between IMS users and non-IMS users address information;

The first-level region and the second-level region can be two levels of administrative regions divided by the country, and one first-level region can include multiple second-level regions. In this embodiment, the first-level region is used as a province. The secondary area is a city as an example. The querying from the ENUM/DNS server to obtain the address information of the next-hop first-level area device (ie, the provincial device) corresponding to the called number in the call request is specifically: finding the called number according to the called number The domain name corresponding to the number, and obtain the IP address of the next-hop first-level area device (that is, the address of the provincial device in the province to which the called number belongs) according to the domain name.

Different from the ENUM/DNS server in the existing solution, which is only configured with address information corresponding to IMS users, the ENUM/DNS server in this embodiment is configured with address information corresponding to IMS users and non-IMS users, specifically: configured with IMS users and The domain name corresponding to the non-IMS user number, and the IP address of the device in the first-level area corresponding to the domain name.

Step 103: Route the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device corresponding to the second-level area to which the called number belongs to route the call request. call request.

In the solution of this embodiment, by configuring the address information corresponding to the IMS user and the non-IMS user in the ENUM/DNS server, it is realized that the S-CSCF receives the IMS user in the second-level area (local city) initiated When making a call request, the address information of the next-hop first-level area device corresponding to the called number in the call request can be directly queried from the ENUM/DNS server, without first judging whether the called number is an IMS user or a non-IMS user The user number, and then according to the type of the called number, the call request is routed to the first-level area device of the first-level area (province) to which the called user belongs via multi-level network element equipment. On the one hand, the burden on the network element equipment is reduced, and the routing efficiency is higher.

Further, in the call routing method of the above-mentioned embodiment, the ENUM/DNS server includes a group-level ENUM/DNS server and a first-level area-level ENUM/DNS server; the group-level ENUM/DNS server is configured with each first-level area The number segment information of IMS users and non-IMS users, the first-level regional ENUM/DNS server is configured with the address information of IMS users and non-IMS users in the first-level region (this province); correspondingly, in step 102 It is described to query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, specifically including:

Query the first-level area equipment corresponding to the called number from the first-level regional ENUM/DNS server in the first-level area (the province of the city corresponding to the S-CSCF, that is, the province to which the calling IMS user belongs) Address information;

If the query is successful, then obtain the address information of the first-level area equipment corresponding to the called number;

If the query fails, query the first-level area to which the called number belongs from the first-level ENUM/DNS server, and obtain the called number from the ENUM/DNS server of the first-level area to which the called number belongs. The address information of the first-level area equipment corresponding to the number.

In this embodiment, if the S-CSCF inquires successfully from the local ENUM/DNS server, the called number is the local district number (that is, the provincial number); if the query fails, the called number is not the local Level area codes (i.e. other province numbers).

In this embodiment, if the called number is an IMS user number, the next-hop first-level area device is specifically the I-CSCF of the province to which the called number belongs. In step 103, the first-level area device uses the The secondary area device corresponding to the secondary area to which the called number belongs routes the call request, specifically: making the I-CSCF of the province to which the called number belongs select the S-CSCF corresponding to the city to which the called number belongs. The CSCF routes the call request, and finally routes the call request to the user terminal corresponding to the called number; the I-CSCF can query the S-CSCF to which the called number belongs by querying the HSS (Home Subscriber Server; Home Subscriber Server).

Further, if the called number is a non-IMS user number, and the next-hop primary area device is specifically IBCF, step 103 enables the primary area device to adopt the secondary area to which the called number belongs The corresponding second-level area equipment routes the call request, specifically including: routing the call request to the first-level area equipment IBCF corresponding to the address information, so that the first-level area equipment adopts the called number to belong to The MGCF of the second-level area of the MGCF routes the call request, so that the MGCF routes the call request to the CS network of the second-level area to which the called number belongs.

Preferably, in this embodiment, the address information corresponding to the non-IMS user configured in the ENUM/DNS server is specifically the domain name corresponding to the non-IMS user number and the provincial IBCF (Interconnection Border Control Function; Interconnection Border Control Function Group), for example, the non-IMS user number in Guangdong Province, the corresponding domain name is IBCF.GD.COM, and the IP address corresponding to the domain name is the address of IBCF in Guangdong Province. Correspondingly, when the called number is a non-IMS user, the next-hop level-1 area device is the IBCF.

The IBCF in this embodiment is configured with the number segment attribution information of each second-level area in the corresponding first-level area (that is, the number segment belongs to the city information), and integrates the function of BGCF (Breakout Gateway Control Function; the exit gateway control function). IBCF Find out the secondary area to which the called number belongs according to the attribution information of the number segment configured by itself, and route the call request to the MGCF (Media Gateway Control Function; Media Gateway Control Function) corresponding to the secondary area to which the called number belongs , the MGCF routes the call request to the CS network in the second-level area, and finally routes the call request to the user terminal corresponding to the called number; the MGCF can control the MGW to convert the media protocol to realize the intercommunication between the IMS network and the CS network.

Specifically, in the method of this embodiment, when the called number is a non-IMS user and belongs to a different primary area from the calling IMS user, in the method of this embodiment, the call request is routed to The called first-level area is then routed to the CS network by the called first-level area, realizing the inter-area (inter-provincial) long-distance calls between IMS users and non-IMS users through the IMS network, which is different from the caller in the prior art. Compared with the solution where the province routes the call request to the CS network and then the CS network routes the call to the province of the called user, the port resources of the traditional long-distance network are saved, and the advantages of IP interworking of the IMS network are maximized.

Fig. 2 is a flow chart of the second embodiment of the call routing method of the present invention, referring to Fig. 2, the method of this embodiment includes:

Step 201: Receive a call request initiated by a non-IMS user sent by the MGCF;

In this embodiment, a second-level area corresponds to one MGCF, and a first-level area corresponds to one I-CSCF. In this embodiment, the first-level area is a province and the second-level area is a city as an example. The method in this embodiment is executed by the I-CSCF of the primary area to which the calling non-IMS user belongs, the MGCF in this step is the MGCF of the secondary area to which the calling non-IMS user belongs, and the non-IMS user initiates The call request is routed to the IMS network through the MGCF.

Step 202: Query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with correspondence between IMS users and non-IMS users address information;

In this embodiment, the called number can be an IMS user or a non-IMS user, and the next-hop first-level area device corresponding to the called number in the call request is obtained by querying from the ENUM/DNS server The specific address information is: find the domain name corresponding to the called number according to the called number, and obtain the IP address of the next-hop first-level area device according to the domain name (that is, the address of the first-level area device in the province to which the called number belongs).

The address information corresponding to the IMS user and the non-IMS user configured in the ENUM/DNS server is specifically: the domain name corresponding to the IMS user and the non-IMS user number, and the IP address of the first-level area device corresponding to the domain name. In this embodiment, the first-level area equipment corresponding to the IMS user is the I-CSCF, and the first-level area equipment corresponding to the non-IMS user is the IBCF.

Step 203: Route the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device corresponding to the second-level area to which the called number belongs to route the call request. call request.

In particular, when the called number is an IMS user in the province (the province to which the calling non-IMS user belongs), the next-hop first-level area device to which it belongs is the I-CSCF itself that executes the method of this embodiment, and accordingly this step is specifically: : Routing the call request to the S-CSCF of the city to which the called number belongs, so that the S-CSCF routes the call request.

In the method of this embodiment, by configuring the address information corresponding to the IMS user and the non-IMS user in the ENUM/DNS server, it is realized that when the I-CSCF receives a call request initiated by a non-IMS user in the province, it can be directly accessed from the Query the ENUM/DNS server to obtain the address information of the next-hop first-level area device corresponding to the called number in the call request, without first judging whether the called number is an IMS user or a non-IMS user number, and then according to the called number The number type routes the call request to the first-level area equipment of the first-level area (province) to which the called user belongs through the multi-level network element equipment. Unblocking the traffic between non-IMS users and non-IMS users reduces the port resources of the traditional traffic network, reduces the burden on network element equipment, and improves the efficiency of call routing.

Fig. 3 is a flow chart of the third embodiment of the call routing method of the present invention, referring to Fig. 3, the method of this embodiment includes:

Step 301: Receive a call request initiated by a non-IMS user sent by the MGCF;

In this embodiment, a second-level area corresponds to one MGCF, and a first-level area corresponds to one I-CSCF. Specifically, in this embodiment, the second-level area is a prefecture-level city and the first-level area is a province as an example. . The method in this embodiment is executed by the I-CSCF of the province to which the calling non-IMS user belongs. The MGCF in this step is the MGCF of the secondary area to which the calling non-IMS user belongs. The call request initiated by the non-IMS user It is routed to the IMS network through the MGCF.

Step 302: Perform an HSS server query on the called number in the call request, if the query is successful, perform step 303, and if the query fails, perform step 304;

In this embodiment, if the HSS server queries successfully, it finds the S-CSCF to which the called number belongs, and the called number is an IMS user in the province; if the query fails, the called number is not an IMS user in the province , that is, the called number may be a local non-IMS user, an out-of-province IMS user or an out-of-province non-IMS user.

Step 303: Routing the call request through the S-CSCF to which the queried called number belongs;

In this embodiment, through the HSS query, when the called number is an IMS user in the province, it is directly routed to the S-CSCF to which the called number belongs, and no subsequent query is performed, which saves routing efficiency.

Step 304: Query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with correspondence between IMS users and non-IMS users address information;

In this embodiment, the ENUM/DNS server includes a group-level ENUM/DNS server and a first-level regional-level ENUM/DNS server; the group-level ENUM/DNS server is configured with information on number segments of IMS users and non-IMS users in each province , the first-level regional ENUM/DNS server is configured with address information of IMS users and non-IMS users in the province;

The querying from the ENUM/DNS server to obtain the address information of the next-hop first-level area device corresponding to the called number in the call request specifically includes:

Query the address information of the first-level area device corresponding to the called number from the provincial ENUM/DNS server in the province (the province corresponding to the I-CSCF, that is, the province to which the calling non-IMS user belongs); if the query is successful, obtain The address information of the first-level regional equipment corresponding to the called number; if the query fails, query the province to which the called number belongs from the group-level ENUM/DNS server, and obtain the first-level information of the province to which the called number belongs The area-level ENUM/DNS server queries to obtain the address information of the first-level area equipment corresponding to the called number.

In this embodiment, if the S-CSCF inquires successfully from the first-level regional ENUM/DNS server in the province, the called number is the non-IMS user number in the province; or non-IMS user numbers in other provinces).

Step 305: Route the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the second-level area device corresponding to the second-level area to which the called number belongs to route the call request. call request.

If the called number is an IMS user number in another province, the next-hop first-level area device is specifically the I-CSCF of the province to which the called number belongs. In this step, the first-level area device uses the called number to belong to The second-level area device corresponding to the second-level area of the call request is routed, specifically: the I-CSCF of the province to which the called number belongs selects the S-CSCF corresponding to the city to which the called number belongs to route the call request call request, and finally route the call request to the user terminal corresponding to the called number; the I-CSCF can query the S-CSCF to which the called number belongs by querying the HSS (Home Subscriber Server; Home Subscriber Server).

In this embodiment, if the called number is a non-IMS user number, the call request is routed to the first-level area equipment corresponding to the address information, so that the first-level area equipment uses the called The secondary area device corresponding to the secondary area to which the calling number belongs routes the call request, specifically including:

routing the call request to the first-level area device IBCF corresponding to the address information, so that the first-level area device uses the MGCF of the second-level area to which the called number belongs to route the call request, and then makes the The MGCF routes the call request to the CS network of the secondary area to which the called number belongs.

The IBCF in this embodiment is configured with the number segment attribution information of each secondary area of the corresponding province, and integrates the function of BGCF (Breakout Gateway Control Function; the exit gateway control function), and the secondary area that IBCF belongs to according to the number segment configured by itself The information finds the city to which the called number belongs, and routes the call request to the MGCF (MediaGateway Control Function; Media Gateway Control Function) corresponding to the city to which the called number belongs, and the MGCF routes the call request to the local city CS network, and finally routes the call request to the user terminal corresponding to the called number; the MGCF can control the MGW to convert the media protocol, so as to realize the intercommunication between the IMS network and the CS network.

The method of this embodiment, on the basis of improving the efficiency of call routing between non-IMS users and IMS users, realizes that the IMS network unblocks the traffic between non-IMS users and non-IMS users, and reduces the burden of traditional traffic networks. Port resources, especially in the case of cross-region (cross-province) calls between non-IMS users and non-IMS users, compared with the existing technology, reduce the burden on network element equipment and improve the efficiency of call routing, and Make the most of the advantages of the IMS network.

Fig. 4 is a schematic structural diagram of Embodiment 1 of the call routing device of the present invention. Referring to Fig. 4, the device of this embodiment is set in the S-CSCF to which the calling user belongs, including:

The receiving module 41 is configured to receive the call request initiated by the IMS user sent by the P-CSCF;

The query module 42 is used to query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with IMS users and non- Address information corresponding to the IMS user;

A routing module 43, configured to route the call request to the first-level area equipment corresponding to the address information, so that the first-level area equipment adopts the second-level area equipment corresponding to the second-level area to which the called number belongs The call request is routed.

The ENUM/DNS server includes a group-level ENUM/DNS server and each first-level regional-level ENUM/DNS server; the group-level ENUM/DNS server is configured with the number segment information of IMS users and non-IMS users in each province, and the one The ENUM/DNS server at the regional level is configured with the address information of IMS users and non-IMS users in the province.

The number range information configured by the group-level ENUM/DNS server indicates the first-level area to which each number range belongs.

Further, the query module 42 in the device of the above-mentioned embodiment is specifically used for: from the first-level region level (the province to which the city corresponding to the S-CSCF belongs, that is, the province to which the calling IMS user belongs) The ENUM/DNS server queries the address information of the first-level area equipment corresponding to the called number; if the query is successful, obtains the address information of the first-level area equipment corresponding to the called number; Query the first-level area to which the called number belongs in the ENUM/DNS server, and obtain the first-level area corresponding to the called number from the first-level area-level ENUM/DNS server of the first-level area to which the called number belongs The address information of the device.

Further, the called number is a non-IMS user number, and accordingly, the routing module 43 is specifically configured to: route the call request to the first-level area device (IBCF) corresponding to the address information, so that The device in the first-level area uses the MGCF of the second-level area to which the called number belongs to route the call request, so that the MGCF routes the call request to the CS network of the second-level area to which the called number belongs .

The device of this embodiment is used to execute the technical solution of the method embodiment shown in FIG. 1 , and its implementation principles and technical effects are similar, and details are not repeated here.

Fig. 5 is a schematic structural diagram of Embodiment 2 of the call routing device of the present invention. The device of this embodiment is set in the I-CSCF of the first-level area to which the calling user belongs. Referring to Fig. 5, the device of this embodiment includes:

A receiving module 51, configured to receive a call request initiated by a non-IMS user sent by the MGCF;

The query module 52 is used to query and obtain the address information of the next-hop first-level area device corresponding to the called number in the call request from the ENUM/DNS server, and the ENUM/DNS server is configured with IMS users and non- Address information corresponding to the IMS user;

The routing module 53 is configured to route the call request to the first-level area equipment corresponding to the address information, so that the first-level area equipment adopts the second-level area equipment corresponding to the second-level area to which the called number belongs The call request is routed.

The device of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 2 , and its implementation principles and technical effects are similar, and details are not repeated here.

Fig. 6 is a schematic structural diagram of the third embodiment of the call routing device of the present invention. The device of this embodiment is set in the I-CSCF of the first-level area to which the calling user belongs. Refer to Fig. 6. The device of this embodiment is shown in Fig. 5 The basis of the structure also includes:

The HSS query module 54 is configured to perform an HSS server query on the called number in the call request after receiving the call request initiated by the non-IMS user sent by the MGCF;

The query module 52 is used to query the ENUM/DNS server to obtain the address information of the next-hop first-level area device corresponding to the called number in the call request if the HSS server query fails, and the ENUM The address information corresponding to the IMS user and the non-IMS user is configured in the /DNS server.

The ENUM/DNS server includes a group-level ENUM/DNS server and a first-level regional-level ENUM/DNS server; the group-level ENUM/DNS server is configured with the number segment information of IMS users and non-IMS users in each province, and the first-level Regional-level ENUM/DNS servers are configured with address information of IMS users and non-IMS users in the province.

Further, in this embodiment, the query module 52 is specifically used for:

Query the address information of the first-level area equipment corresponding to the called number from the provincial ENUM/DNS server;

If the query is successful, then obtain the address information of the first-level area equipment corresponding to the called number;

If the query fails, query the province to which the called number belongs from the group-level ENUM/DNS server, and obtain the called number from the first-level regional ENUM/DNS server in the first-level area to which the called number belongs. The address information of the first-level area equipment corresponding to the call number.

In the above device embodiment, further, if the called number is a non-IMS user number, the routing module 53 is specifically configured to:

routing the call request to the first-level area device corresponding to the address information, so that the first-level area device uses the MGCF of the second-level area to which the called number belongs to route the call request, so that the The MGCF routes the call request to the CS network of the secondary area to which the called number belongs.

The device in this embodiment can be used to implement the technical solution of the method shown in FIG. 3 , and its implementation principle and technical effect are similar, and details are not repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (6)

1. a call route method, it is characterised in that including:

Receive the IMS Client-initiated call request that P-CSCF sends；

Under from ENUM/DNS server, inquiry acquisition is corresponding with the called number in described call request One address information jumping level-1 area equipment, is configured with IMS user and non-in described ENUM/DNS server The address information that IMS user is corresponding；

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described The level-2 area equipment that the level-2 area of level-1 area equipment employing described called number ownership is corresponding route institute State call request；

Described called number is non-IMS Subscriber Number, described described call request is routed to described The level-1 area equipment that location information is corresponding, so that described level-1 area equipment uses described called number ownership Level-2 area equipment corresponding to level-2 area route described call request, specifically include:

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described Level-1 area equipment uses the MGCF of the level-2 area of described called number ownership to route described call request, And then make described MGCF that described call request be routed to the level-2 area of described called number ownership CS network.

2. a call route method, it is characterised in that including:

Receive the non-IMS Client-initiated call request that MGCF sends；

Under from ENUM/DNS server, inquiry acquisition is corresponding with the called number in described call request One address information jumping level-1 area equipment, is configured with IMS user and non-in described ENUM/DNS server The address information that IMS user is corresponding；

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described The level-2 area equipment that the level-2 area of level-1 area equipment employing described called number ownership is corresponding route institute State call request；

Described called number is non-IMS Subscriber Number, described described call request is routed to described The level-1 area equipment that location information is corresponding, so that described level-1 area equipment uses described called number ownership Level-2 area equipment corresponding to level-2 area route described call request, specifically include:

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described Level-1 area equipment uses the MGCF of the level-2 area of described called number ownership to route described call request, And then make described MGCF that described call request be routed to the level-2 area of described called number ownership CS network.

3. method as claimed in claim 2, it is characterised in that the non-IMS that described reception MGCF sends After Client-initiated call request, also include:

Called number in described call request is carried out HSS server lookup；

Described from ENUM/DNS server inquiry obtain corresponding with the called number in described call request The address information of down hop level-1 area equipment, described ENUM/DNS server is configured with IMS user And the address information that non-IMS user is corresponding, particularly as follows:

If HSS server lookup failure, then described from ENUM/DNS server inquiry obtain and exhale with described It is the address information of the down hop level-1 area equipment that the called number in request is corresponding, described ENUM/DNS Server is configured with IMS user and address information corresponding to non-IMS user.

4. a call routing device, it is characterised in that including:

Receiver module, for receiving the IMS Client-initiated call request that P-CSCF sends；

Enquiry module, for inquiry from ENUM/DNS server obtain with described call request called The address information of the down hop level-1 area equipment that number is corresponding, is configured with in described ENUM/DNS server IMS user and address information corresponding to non-IMS user；

Routing module, for being routed to the level-1 area corresponding with described address information by described call request Equipment, so that two grades that the level-2 area of described level-1 area equipment employing described called number ownership is corresponding Area equipment route described call request；

Described called number is non-IMS Subscriber Number, described routing module specifically for:

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described Level-1 area equipment uses the MGCF of the level-2 area of described called number ownership to route described call request, And then make described MGCF that described call request be routed to the level-2 area of described called number ownership CS network.

5. a call routing device, it is characterised in that including:

Receiver module, for receiving the non-IMS Client-initiated call request that MGCF sends；

Enquiry module, for inquiry from ENUM/DNS server obtain with described call request called The address information of the down hop level-1 area equipment that number is corresponding, is configured with in described ENUM/DNS server IMS user and address information corresponding to non-IMS user；

Routing module, for being routed to the level-1 area corresponding with described address information by described call request Equipment, so that two grades that the level-2 area of described level-1 area equipment employing described called number ownership is corresponding Area equipment route described call request；

Described called number is non-IMS Subscriber Number, described routing module specifically for:

Described call request is routed to the level-1 area equipment corresponding with described address information, so that described Level-1 area equipment uses the MGCF of the level-2 area of described called number ownership to route described call request, And then make described MGCF that described call request be routed to the level-2 area of described called number ownership CS network.

6. device as claimed in claim 5, it is characterised in that described, also includes:

HSS enquiry module, after the non-IMS Client-initiated call request in reception MGCF transmission, Called number in described call request is carried out HSS server lookup；

If described enquiry module is for HSS server lookup failure, then described from ENUM/DNS server Inquiry obtains the address letter of the down hop level-1 area equipment corresponding with the called number in described call request Breath, is configured with IMS user and address information corresponding to non-IMS user in described ENUM/DNS server.