CN106453345A - Call set-up method and system - Google Patents

Abstract

The invention discloses a method and system for establishing a call, relates to the technical field of communication, and can solve the problem that a call cannot be established when a number portability network user is called. The method includes: the S-CSCF module receives the call request carrying the first identifier of the called user; according to the first identifier, obtains the subscription information corresponding to the called user, and determines the subscription type of the called user; when the subscription type is number portability When transferring the user, the call request is forwarded to the number portability transfer application server; the number portability transfer application server determines the identifier of the ported-in operator corresponding to the called user according to the subscription information; according to the ported-in operator's identifier and the first identifier, Determine the second identity of the called user; according to the second identity, route the call request to the gateway office through the S-CSCF and MGCF modules; the gateway office forwards the call request to the ported operator network corresponding to the second identity. The invention is applied in the process of establishing a call by a number portability transfer network user as a called party.

Description

Method and system for call establishment

technical field

The present invention relates to the technical field of communication, in particular to a method and system for establishing a call.

Background technique

Number portability refers to the user changing the contract operator without changing the user number. Among them, the operator signed before porting the number to the network (that is, the operator that is transferred out) is called the porting-out operator, and the operator signed after the number is ported to the network (ie, the operator that is transferred in) is called the porting-in operator.

VoLTE (Voice over LTE, LTE call) is a voice service based on IMS (IP Multimedia Subsystem, IP Multimedia Subsystem). VoLTE only supports PS (Packet Switch, packet switching) domain, and uses SIP (SessionInitiation Protocol, session initiation protocol) Signaling establishes and routes calls, and VoLTE does not support CS (Circuit Switch, circuit switched) domain, so the existing CS voice number portability call solution is no longer suitable for VoLTE users. After the number is transferred to the network, the connection problem of the calling service.

Generally, two types of situations are involved in calling services of VoLTE users after porting the number to the network, which are as follows:

1. As a calling user, a VoLTE user whose number is ported to the network can complete the call by following the calling process of the ported operator's network, no matter whether the ported operator's network is a 2G network, 3G network or LTE network Establish. Among them, the calling process of porting into the operator's network includes: VoLTE users who port their number to the network need to perform a new user registration process in the porting operator's network, and then use the new public user ID to establish a call.

2. The VoLTE user who ported the number to the network is the called user. When the calling user initiates a call request, follow the routing principle of the calling operator's network. First, the call request will be routed to the called user (that is, the number ported to the network) VoLTE users) carry out the IMS network of the operator, but because the called user has already moved out, the IMS network of the carried out operator cannot complete the normal service connection, and the call establishment fails, so the existing call solution is not suitable for number portability The case where a VoLTE user who transfers to the network is used as the called user.

Contents of the invention

The present invention provides a method and system for establishing a call. A VoLTE user who can transfer a number to a network is used as a called user, and the existing IMS network cannot establish a call.

To achieve the above object, the present invention adopts the following technical solutions:

In the first aspect, the present invention provides a method for call establishment, which is applied to a call establishment system located on the network side of the portability operator, and the call establishment system includes a service call session control function S-CSCF module, and a number portability transfer network application server , Media gateway control function MGCF module and gateway office, including:

The S-CSCF module receives a call request, and the call request carries a first identifier of the called user, and the first identifier is the user identifier of the called user in the ported-out operator network;

Obtain the subscription information corresponding to the called user according to the first identifier;

determining the subscription type of the called user according to the subscription information;

When the subscription type is a number portability transfer user, forwarding the call request to the number portability transfer application server;

The number portability transfer application server determines the identity of the portability operator corresponding to the called user according to the subscription information;

Determine the second identity of the called user according to the identity of the ported operator and the first identity, where the second identity includes the identity of the ported operator;

Routing the call request to the gateway office sequentially through the S-CSCF module and the MGCF module according to the second identifier;

The gateway office forwards the call request to the portable operator network corresponding to the second identifier.

In a second aspect, the present invention provides a system for call establishment, which is applied to the porting-out operator's network side, and the system includes:

The S-CSCF module is configured to receive a call request, where the call request carries a first identifier of the called user, where the first identifier is the user identifier of the called user in the ported operator network;

The S-CSCF module is further configured to acquire subscription information corresponding to the called user according to the first identifier;

determining the subscription type of the called user according to the subscription information;

When the subscription type is a number portability transfer user, forwarding the call request to the number portability transfer application server;

The number portability transfer application server is configured to determine the identity of the portability operator corresponding to the called user according to the subscription information;

Determine the second identity of the called user according to the identity of the ported operator and the first identity, where the second identity includes the identity of the ported operator;

The number portability application server is further configured to route the call request to the gateway office sequentially through the S-CSCF module and the MGCF module according to the second identifier;

The gateway office is configured to forward the call request to the portable operator network corresponding to the second identifier.

The present invention provides a method and system for call establishment, which converts the first identification of the number portability user into a second identification through the number portability application server in the network of the porting-out operator, and the second identification contains the porting-in operation According to the second identifier, the call request is routed to the gateway office interconnected with the network of the ported operator through S-CSCF and MGCF according to the second identity, and finally the gateway office forwards the call request to the network of the ported operator, thus completing The number portability user makes the establishment of the called call. The invention solves the problem in the prior art that after the call is routed to the IMS network of the called user's ported operator, the routing cannot be continued, resulting in the failure of call establishment, and realizes that when the ported number transfer user is called, the ported out The operator's network can smoothly forward the call request to the called user's network, thus perfecting the call solution of IMS network portability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a flowchart of a method for establishing a call provided by an embodiment of the present invention;

FIG. 2 is a flowchart of another method for establishing a call provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the call establishment process for a number portability transfer user being called by the implementation of the present invention;

Fig. 4 is a schematic structural diagram of a call establishment system provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention can be used in a call establishment system of an IMS network. As shown in FIG. Control Function, service call session control function) module, HSS (TheHome Subscribe Server, home subscriber server), number portability application server, MGCF (MediaGateway Control Function, media gateway control function) module and gateway office.

For a better understanding of the technical solution in the present invention, the main functional modules in the call setup system are briefly introduced below, as follows:

The I-CSCF module, similar to the gateway node of IMS, provides the functions of local user service node allocation, route query and IMS inter-domain topology hiding.

The S-CSCF module is in the core control position in the IMS core network. It is responsible for user registration authentication and session control, and performs basic session routing functions for IMS users on the calling segment, that is, the called segment. Trigger rules, when conditions are met, value-added service routing triggers to the application server and service control interaction.

The HSS stores the subscription information of the IMS user, including basic identifiers, routing information, and service subscription information.

Example 1

In order to solve the problem that the IMS network of the existing mobile operator cannot establish a call when the number portability user is the called user, the embodiment of the present invention provides a method for call establishment, as shown in Figure 1, the method includes :

101: The S-CSCF module receives a call request, where the call request carries the first identifier of the called user.

Wherein, the first identifier is the user identifier of the called user in the mobile carrier network.

As a specific embodiment, when the calling user dials the user number of the called user, since the operator network of the calling user does not know that the called user has ported the number to the network, it is adopted that the called user has transferred the number to the network. Routing with the previous user ID, converting the call request into an INVITE message and forwarding it to the ported-out operator network of the called number. Wherein, the value of the Request URI parameter of the INVITE message is the user identification of the called user in the mobile carrier network, and the home network domain name in the user identification format has a corresponding relationship with the carrier network, so it can be known that the called user corresponds to the mobile network. out of the carrier's network.

102: Acquire subscription information corresponding to the called user according to the first identifier.

As a specific embodiment, the S-CSCF module searches the corresponding subscription information in the local database according to the first identifier of the called user. If it is not found in the local database, it queries the HSS, downloads the corresponding subscription information of the called user, and stores it. in the local database.

103: Determine the subscription type of the called user according to the subscription information.

As a specific embodiment, the HSS adds the subscription type of the number porting user to the network in the subscription information to identify the number porting user, and writes the information of the porting operator in the contract information of the number porting user .

104: When the subscription type is a number portability transfer user, forward the call request to the number portability transfer application server.

As a specific embodiment, the number portability transfer application service can share a set of hardware equipment with existing application services such as MMTel (MultiMedia Telephony, multimedia telephony) application, and the business logic can be independent, and the business logic can also be combined. Here, No limit.

105: The number portability transfer application server determines the identifier of the ported-in operator corresponding to the called user according to the subscription information.

As a specific embodiment, the number portability application service obtains the information of the porting operator corresponding to the called user according to the subscription information corresponding to the called user, and determines the identity of the porting operator.

106: Determine a second identifier of the called user according to the identifier of the ported operator and the first identifier.

Wherein, the second identifier includes the identifier of the carried operator.

As a specific embodiment, according to the identification of the ported-in operator, the prefix of the ported-in operator is added before the first logo, for example: when the ported-in operator is China Unicom Beijing Branch, and the prefix of China Unicom Beijing Branch The identifier is A ₁ B ₁ C ₁ D ₁ , then the second identifier of the called user is: A ₁ B ₁ C ₁ D ₁ + the original called number. The number portability transfer application server replaces the value of the Request URI parameter of the INVITE message with the second identifier.

107: Routing the call request to the gateway through the S-CSCF module and the MGCF module in sequence according to the second identifier.

As a specific embodiment, this step can be refined as:

107a: The number portability transfer application server forwards the INVITE message with parameters replaced to the S-CSCF module.

107b: Then the S-CSCF module analyzes the number of the Request URI parameter of the INVITE message, and routes the INVITE message to the MGCF module.

Among them, the MGCF module implements the communication function between the IMS user and the CS user by converting the protocol. Usually, all call signaling from the CS network is sent to the MGCF module, and after protocol conversion, the call is forwarded to the IMS network; similarly, all calls initiated by the IMS side need to be sent to the CS network through the MGCF module. Therefore, the present invention has no restriction on the network type of the operator that the called user is brought into. Whether it is CS voice or IMS voice, the call request can be smoothly routed through the MGCF module.

107c: After analyzing the number of the Request URI parameter in the received INVITE message, the MGCF module forwards the INVITE message to the gateway office interconnected with other operators' networks.

108: The gateway office forwards the call request to the ported operator network corresponding to the second identifier.

As a specific embodiment, after analyzing the number of the Request URI parameter in the received INVITE message, the gateway office obtains the ported-in operator ID corresponding to the second ID of the called number, and then forwards the call to the ported-in operator The gateway office of the network is forwarded to the corresponding server by the gateway office of the ported operator network, and the subsequent call establishment is completed by the ported operator network.

The present invention provides a method for call establishment, which converts the first identification of the number portability user into a second identification through the number portability application server in the network of the porting-out operator, and the second identification contains the identification of the porting-in operator According to the second identity, the call request is routed to the gateway office interconnected with the ported operator's network through the S-CSCF and MGCF, and finally the gateway office forwards the call request to the ported operator's network, thus completing number portability The transit user does the establishment of the called call. The invention solves the problem in the prior art that after the call is routed to the IMS network of the called user's ported operator, the routing cannot be continued, resulting in the failure of call establishment, and realizes that when the ported number transfer user is called, the ported out The operator's network can smoothly forward the call request to the called user's network, thus perfecting the call solution of IMS network portability.

Example 2

Further, as a refinement and extension of the method shown in Figure 1, this embodiment also provides a method for call establishment, as shown in Figure 2, the method includes:

201: The I-CSCF module forwards the received call request sent by the calling network to the S-CSCF module.

As a specific embodiment, after receiving the call request sent by the calling network, the I-CSCF module queries the HSS for the available S-CSCF capability set, obtains the S-CSCF allocated for the called user, and sends the call request to S-CSCF allocated for the called user.

Each process in step 201 is shown as 201a, 201b and 201c in Fig. 2 respectively.

202: The S-CSCF module acquires subscription information corresponding to the called user according to the first identifier.

The specific implementation manner is the same as step 102, which will not be repeated here.

203: Determine the subscription type of the called user according to the subscription information.

The specific implementation manner is the same as that of step 103, which will not be repeated here.

204: When the subscription type of the called user is a number portability transfer user, the S-CSCF module forwards the call request to the number portability transfer application server, and ends the detection of the service trigger condition of the called user.

Wherein, the called user's subscription information downloaded by the S-CSCF module in step 202 includes service trigger rules, namely iFC (Initial Filter Criteria: initial filter rule). iFC defines service triggering conditions and target application services according to different priorities. The S-CSCF module performs iFC matching detection when processing user service requests, and triggers the specified application service if the triggering conditions are met.

Each process in step 204 is shown as 204a and 204b in FIG. 2, respectively.

As a specific embodiment, if the user subscribes to the number portability transfer service, the detection sequence of this service is the highest priority, then the S-CSCF module triggers the number portability transfer application service, and forwards the call request to the number portability transfer service. After connecting to the web application server, the detection of subsequent service trigger conditions is no longer performed.

205: The number portability transfer application server determines the identifier of the ported-in operator corresponding to the called user according to the subscription information.

206: Determine the second identifier of the called user according to the identifier of the ported operator and the first identifier.

Wherein, the second identifier includes the identifier of the carried operator.

207: According to the second identifier of the called user, the number portability network application server routes the call request to the S-CSCF module.

208: According to the second identifier of the called user, the S-CSCF module routes the call request to the MGCF module.

209: According to the second identifier of the called user, the MGCF module routes the call request to the gateway office.

210: The gateway office routes the call request to the ported operator network according to the second identifier, and stops triggering other services of the called user.

As a specific embodiment, after the gateway office routes the call request to the ported operator's network, it stops detecting the triggering conditions of the called user's service, that is, no longer triggers other services, such as the anchor service, so as to avoid an endless loop of routing.

Optionally, the gateway office and the MGCF module can be co-located on one physical server, and the business logic is independent.

The present invention provides a method for call establishment, which converts the first identification of the number portability user into a second identification through the number portability application server in the network of the porting-out operator, and the second identification contains the identification of the porting-in operator According to the second identity, the call request is routed to the gateway office interconnected with the ported operator's network through the S-CSCF and MGCF, and finally the gateway office forwards the call request to the ported operator's network, thus completing number portability The transit user does the establishment of the called call. The invention solves the problem in the prior art that after the call is routed to the IMS network of the called user's ported operator, the routing cannot be continued, resulting in the failure of call establishment, and realizes that when the ported number transfer user is called, the ported out The operator's network can smoothly forward the call request to the called user's network, thus perfecting the call solution of IMS network portability.

The present invention also provides a complete process of establishing a call that is carried out of the operator's network when a number portability transfer user is called, and the specific flow is shown in FIG. 3 .

The embodiment of the present invention also provides a system 40 for call establishment, as shown in FIG. 4, which is applied to the network side of the porting operator. The system includes:

The S-CSCF module 41 is configured to receive a call request, where the call request carries a first identifier of the called user, where the first identifier is the user identifier of the called user in the carrier network; According to the first identification, obtain the subscription information corresponding to the called user; determine the subscription type of the called user according to the subscription information; when the subscription type is a number portability network user, forward the call The request is sent to the number portability transfer application server 42.

The number portability network application server 42 is configured to determine the identifier of the ported-in operator corresponding to the called user according to the subscription information; The second identification of the called user, the second identification includes the identification of the ported operator; according to the second identification, the call request is routed through the S-CSCF module and the MGCF module to Gateway Bureau43.

The gateway office 43 is configured to forward the call request to the portable operator network corresponding to the second identifier.

Further, the number portability transfer application server 42 is also configured to add the ported-in operator's identifier before the first identifier to form a new identifier; determine the formed new identifier as the Second logo.

The S-CSCF module 41 is further configured to end the service to the called user after forwarding the call request to the number portability application server when the subscription type is a number portability transfer user Detection of trigger conditions.

The call establishment system further includes HSS44, configured to add the subscription type of the number portability network user to the subscription information.

The gateway office 43 is further configured to stop detecting the service trigger condition of the called user after forwarding the call request to the ported operator network corresponding to the second identifier.

The invention provides a system for call establishment, which converts the first identification of the number portability user into a second identification through the number portability application server in the network of the porting-out operator, and the second identification contains the identification of the porting-in operator According to the second identity, the call request is routed to the gateway office interconnected with the ported operator's network through the S-CSCF and MGCF, and finally the gateway office forwards the call request to the ported operator's network, thus completing number portability The transit user does the establishment of the called call. The invention solves the problem in the prior art that after the call is routed to the IMS network of the called user's ported operator, the routing cannot be continued, resulting in the failure of call establishment, and realizes that when the ported number transfer user is called, the ported out The operator's network can smoothly forward the call request to the called user's network, thus perfecting the call solution of IMS network portability.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A method for call set-up, characterized in that the method is applied to a call set-up system located at the network side of the porting operator, and the call set-up system includes a service call session control function S-CSCF module, a number portability network Application server, media gateway control function MGCF module and gateway office, described method comprises: The S-CSCF module receives a call request, and the call request carries a first identifier of the called user, and the first identifier is the user identifier of the called user in the carrier network; Obtain the subscription information corresponding to the called user according to the first identifier; determining the subscription type of the called user according to the subscription information; When the subscription type is a number portability transfer user, forwarding the call request to the number portability transfer application server; The number portability transfer application server determines the identity of the portability operator corresponding to the called user according to the subscription information; Determine the second identity of the called user according to the identity of the ported operator and the first identity, where the second identity includes the identity of the ported operator; Routing the call request to the gateway office sequentially through the S-CSCF module and the MGCF module according to the second identifier; The gateway office forwards the call request to the portable operator network corresponding to the second identifier. 2. The method according to claim 1, wherein the determining the second identity of the called user according to the carried operator's identity and the first identity comprises: Adding the identification of the ported operator before the first identification to form a new identification; Determining the formed new identifier as the second identifier. 3. The method according to claim 1, wherein when the subscription type is a number portability transfer user, after forwarding the call request to the number portability transfer application server, the method further comprises : The S-CSCF module finishes detecting the service trigger condition of the called user. 4. The method according to claim 1, wherein the call establishment system further comprises a Home Subscriber Server (HSS), and the method further comprises: The HSS adds the subscription type of the number portability user to the subscription information. 5. The method according to claim 1, characterized in that, after the gateway office forwards the call request to the ported operator network corresponding to the second identifier, the method further comprises: the The gateway office stops detecting the service trigger condition of the called user. 6. A system for call establishment, characterized in that it is applied to the network side of the porting operator, and the system includes: The S-CSCF module is configured to receive a call request, where the call request carries a first identifier of the called user, where the first identifier is the user identifier of the called user in the ported operator network; The S-CSCF module is further configured to acquire subscription information corresponding to the called user according to the first identifier; determining the subscription type of the called user according to the subscription information; When the subscription type is a number portability transfer user, forwarding the call request to a number portability transfer application server; The number portability transfer application server is configured to determine the identity of the portability operator corresponding to the called user according to the subscription information; Determine the second identity of the called user according to the identity of the ported operator and the first identity, where the second identity includes the identity of the ported operator; The number portability application server is further configured to route the call request to the gateway office sequentially through the S-CSCF module and the MGCF module according to the second identifier; The gateway office is configured to forward the call request to the portable operator network corresponding to the second identifier. 7. The system according to claim 6, wherein the number portability transfer application server is further configured to add the identification of the porting operator before the first identification to form a new identification; The formed new identifier is determined as the second identifier. 8. The system according to claim 6, wherein the S-CSCF module is further configured to forward the call request to the number portability network when the subscription type is a number portability transfer user. After the web application server, the detection of the service trigger condition of the called user is completed. 9. The system according to claim 6, further comprising an HSS for adding the subscription type of the number portability transfer user to the subscription information. 10. The system according to claim 6, wherein the gateway office is further configured to stop detecting the The service trigger condition of the called user.