WO2014094440A1

WO2014094440A1 - Method and system for implementing call routing

Info

Publication number: WO2014094440A1
Application number: PCT/CN2013/080967
Authority: WO
Inventors: 苏少龙
Original assignee: 华为技术有限公司
Priority date: 2012-12-21
Filing date: 2013-08-07
Publication date: 2014-06-26
Also published as: CN102984405A

Abstract

The present invention relates to a method and system for implementing call routing. The method includes: a call session control function (CSCF) entity receiving a first call request sent by a calling user equipment, the first call request carrying a called number; sending to a telephone number mapping (ENUM) server an Internet protocol private branch exchange (IP PBX) identifier query request, the IP PBX identifier query request carrying the called number; receiving an IP PBX identifier query response sent by the ENUM server, the IP PBX identifier query response carrying an IP PBX identifier corresponding to the called number and the IP PBX identifier being used for identifying an IP PBX; and according to the IP PBX identifier, sending a second call request to the IP PBX, the second call request carrying the called number.The present invention solves the problem of acquisition of an IP PBX identifier by a core network side.

Description

Method and system for realizing call routing The present application claims priority to Chinese patent application filed on December 21, 2012 by the Chinese Patent Office, application number 201210560501.6, and entitled "A method and system for implementing call routing" The entire contents of which are incorporated herein by reference. Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and system for implementing call routing.

Background technique

PBX (private branch exchange) is widely used in enterprise offices to complete inter-enterprise intercommunication and intercommunication between the enterprise and the Public Switched Telephone Network (PSTN). The traditional PBX uses the narrowband to access the PSTN. As the telecommunication network moves toward the Internet (Internet Protocol), an Internet Protocol Private Branch Exchange (IP PBX) based on the IP protocol appears. The IP PBX is an Internet Protocol-based telephone exchange that combines the functions of a computer network and a telephone exchange. User equipment (User Equipment, UE for short) in the IP PBX system uses IP for data communication. IP PBXs in different systems can realize long-distance communication, e-office and e-commerce through the Internet (Internet). .

The Internet Protocol Multimedia Subsystem (IMS) was introduced by the 3rd Generation Partnership Project (3GPP) in the R5 phase to introduce the Internet experience into the mobile network.

Through IMS, IP networks can be enabled to operate, manage, and add value to multimedia communications. To implement such multimedia communication, the IMS needs to be able to identify the IP PBX serving the called UE, that is, the IP PBX identity of the IP PBX that needs to be able to obtain the service for the called UE. However, there is currently no way to solve the problem of obtaining the IP PBX logo on the core network side. Summary of the invention

In view of the above, an object of the present invention is to provide a method and system for implementing call routing, so that a Call Session Control Function (CSCF) entity in an IMS can acquire an IP PBX serving a called UE. IP PBX logo.

To achieve the above object, a first aspect of the present invention provides a method for implementing call routing, the method comprising:

Call session control function, the CSCF entity receives a first call request sent by the calling user equipment, and the first call request carries the called number;

Transmitting to the phone number mapping ENUM server sends an internet protocol user switch IP PBX identity query request, and the IP PBX identity query request carries the called number;

Receiving an IP PBX identity query response sent by the ENUM server, where the IP PBX identity query response carries an IP PBX identity corresponding to the called number, and the IP PBX identity is used to identify an IP PBX;

And sending, according to the IP PBX identifier, a second call request to the IP PBX, where the second call request carries the called number.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the method further includes: the ENUM server pre-preserving a mapping relationship between the called number and the IP PBX identifier.

With the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the sending, by the IP PBX identifier, the second call request to the IP PBX , including:

And sending, according to the IP PBX identifier, the second call request to the IP PBX, where the second call request carries the called number and the IP PBX identifier.

In a second aspect, the present invention further provides a call session control function CSCF entity in an IP multimedia subsystem, where the CSCF entity includes:

a receiving unit, configured to receive a first call request sent by the calling user equipment, where the first call is requested Ask to carry the called number;

a sending unit, configured to send an Internet Protocol Subscriber Switch IP PBX identity query request to the phone number mapping ENUM server, where the IP PBX identity query request carries the called number received by the receiving unit;

The receiving unit is further configured to receive an IP PBX identifier query response sent by the ENUM server, where the IP PBX identifier query response carries an IP PBX identifier corresponding to the called number, and the IP PBX identifier is used to identify IP PBX;

The sending unit is further configured to send a second call request to the IP PBX according to the IP PBX identifier received by the receiving unit, where the second call request carries the called number.

In conjunction with the second aspect, in a first possible implementation manner of the second aspect, the second call request sent by the sending unit further carries the IP PBX identifier.

In a third aspect, the present invention also provides a telephone number mapping ENUM server, the ENUM server comprising:

a receiving unit, configured to receive a call session control function, an internet protocol user switch sent by the CSCF entity, an IP PBX identifier query request, and the IP PBX identifier query request carries the called number;

a matching unit, configured to find, according to the called number received by the receiving unit, an IP PBX identifier corresponding to the called number;

And a sending unit, configured to send an IP PBX identifier query response, where the IP PBX identifier query response carries the IP PBX identifier obtained by the matching unit.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the method further includes: a saving unit, configured to pre-save a mapping relationship between the called number and the IP PBX identifier, to facilitate the matching unit Obtaining an IP PBX identifier corresponding to the called number according to the called number.

In a fourth aspect, the present invention further provides a system for implementing call routing, the system comprising: a call session control function CSCF entity and an ENUM server provided by an embodiment of the present invention. The method and system for implementing the call routing provided by the present invention, by pre-planning and configuring the mapping relationship between the PBX number and the PBX on the ENUM server, the CSCF entity on the core network side can directly obtain the IP PBX identifier through the ENUM server, and solve the core network. The problem of obtaining the IP PBX identifier on the side does not require modification of the device on the core side of the IMS system, which reduces the complexity of data configuration. It is applicable to various IMS core networks and has strong portability.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a system architecture diagram of implementing call routing in an IMS network according to Embodiment 1 of the present invention;

FIG. 2 is a flowchart of a method for implementing call routing according to Embodiment 1 of the present invention; FIG. 3 is a flowchart of a method for querying call routing according to Embodiment 1 of the present invention; A signaling diagram for implementing a call routing process; FIG. 5 is a structural diagram of a system for implementing call routing according to Embodiment 2 of the present invention; FIG. 6 is a structural diagram of a CSCF entity and an ENUM server according to Embodiment 2 of the present invention; FIG. 7 is a structural diagram of a CSCF entity according to Embodiment 3 of the present invention;

FIG. 8 is a structural diagram of an ENUM server according to Embodiment 3 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments.

ENUM (Telephone Numbers to URI Mapping) is a mapping that converts an E.164 number into a URI (Uniform Resource Indentifier, abbreviated as: Uniform Resource Indentifier). Through this mapping, the E.164 number can be converted into a domain name in the DNS (Domain Name Server), so that the international unified E.164 phone number becomes a network address resource that can be used in the Internet.

1 is a system architecture diagram of implementing call routing in an IMS network according to an embodiment of the present invention. As shown in FIG. 1, the IMS system includes a network element device in an IMS core network, and session border control on an access side. Session Border Controller (SBC) and IP PBX.

The network element device in the IMS core network may include a CSCF (Call Session Control Function) entity, a BCF (Border Control Function) entity, and an ENUM server. The CSCF entity may include a PCSCF (Proxy-Call Session Control Function) entity, a SCSCF (Serving-Call Session Control Function) entity, and an I-CSCF (Interrogating-Call Session). Control Function, Query - Call Session Control Function) Entity. The BCF entity can connect to the SBC through the IP bearer network.

Embodiment 1

Based on the system architecture diagram shown in FIG. 1, the embodiment of the present invention provides a method for implementing call routing. As shown in FIG. 2, the method includes:

Step S101: The CSCF entity receives a first call request sent by the calling user equipment, where the first call request carries the called number.

When the calling user equipment in the IMS network initiates a call to the called user equipment, the CSCF entity receives the first call request sent by the calling user equipment, and the first call request is usually based on a Session Initial Protocol (Session Initial Protocol). : SIP ) INVITE message, the INVITE message carries the called number. It should be noted that the CSCF entity may be an SCSCF entity.

Step S102: The CSCF entity sends an IP PBX identity query request to the ENUM server, where the IP PBX identity query request carries the called number.

Step S103: The CSCF entity receives an IP PBX identity query response sent by the ENUM server, where the IP PBX identity query response carries an IP PBX identifier corresponding to the called number, and the IP PBX identifier is used to identify an IP PBX. .

The ENUM server pre-stores a mapping relationship between the phone number and the IP PBX identifier, and the IP PBX identifier is used to uniquely identify the corresponding IP PBX. The ENUM server can obtain the same as the called number according to the called number. The IP PBX identifier corresponding to the number.

According to the RFC4904 protocol definition, the IP PBX identifier includes the interface parameters of the IP PBX. Specifically, the IP PBX identifier can include the following interface parameters: tgr and trunk-context. The IP PBX identifier can be represented by the interface parameters tgr and trunk-context.

Step S104: The CSCF entity sends a second call request to the IP PBX according to the IP PBX identifier, where the second call request carries the called number.

In this embodiment, the second call request sent by the CSCF entity may further carry the IP PBX identifier, and the CSCF entity may send the second call request by using the BCF entity.

Specifically, the CSCF entity first forwards the second call request carrying the called number and the IP PBX identifier to the BCF entity, and the BCF entity forwards the second call request to the SBC in the access side, according to the received The IP PBX identifier in the second call request finds the IP PBX corresponding to the called number, and routes the call to the IP PBX.

FIG. 3 is a flowchart of a method for querying a call route according to the embodiment. As shown in FIG. 3, the method for querying a call route of the present invention includes:

Step S201: The ENUM server receives an IP PBX identity query request sent by the CSCF entity, where the IP PBX identity query request carries the called number.

Step S202: The ENUM server searches for the called number according to the called number. Corresponding IP PBX logo.

Step S203: The ENUM server sends an IP PBX identity query response to the CSCF entity, where the IP PBX identity query response carries an IP PBX identifier corresponding to the called number.

As shown in FIG. 4, a signaling diagram for implementing a call routing process according to this embodiment includes:

51. The SCSCF entity receives a first call request that is sent by the calling user equipment and carries the called number.

52. The SCSCF entity sends an IP PBX identity query request to the ENUM server, where the IP PBX identity query request carries the called number.

The ENUM server searches for the IP PBX identifier corresponding to the called number according to the mapping relationship between the saved phone number and the IP PBX identifier, and sends an IP PBX identifier query response to the SCSCF entity, where the IP PBX identifier query response carries the search result. IP PBX logo.

For example, as an example and not by way of limitation, the ENUM server may find an IP PBX identifier corresponding to the called number, and the IP PBX identifier may be represented by "tgrp=l; trunk-context=vlanl".

After finding the IP PBX identifier corresponding to the called number, the ENUM server sends the IP PBX identifier corresponding to the called number to the SCSCF entity by using an IP PBX identifier query response; as an example and not by way of limitation, the called number is 28780808. The information carried by the IP PBX identifier query response can be expressed as "!2878*!2878\l;tgrp=l;tnmk-context=vlanl !,,. "!2878*!2878\1" in the regular expression The called number is 28780808.

S4. The SCSCF entity sends a second call request to the IP PBX corresponding to the IP PBX identifier according to the IP PBX identifier.

The second call request may further carry the IP PBX identifier, where the IP PBX identifier is used to identify the IP PBX, and according to the IP PBX, the second call may be sent to the IP PBX corresponding to the IP PBX identifier. begging.

Step S4 can be further refined into the following three steps:

541. The SCSCF entity sends a second call request to the BCF entity, where the second call request carries the called number and the IP PBX identifier.

542. The BCF entity sends the second call request to the SBC.

543. The SBC sends the second call request to the IP PBX corresponding to the IP PBX identifier according to the IP PBX identifier carried in the second call request.

Specifically, the SBC can find the corresponding IP PBX according to tgr and trunk-context, and send the second call request to the IP PBX.

The above is a detailed description of the method for implementing call routing provided by the present invention. The system for implementing call routing provided by the present invention is described in detail below.

Embodiment 2

FIG. 5 is a structural diagram of a system for implementing call routing according to the embodiment. As shown in FIG. 5, the system includes: a CSCF entity 10 and an ENUM server 20, where

The CSCF entity 10 is configured to receive a first call request sent by the calling user equipment, where the first call request carries the called number, and sends an IP PBX identity query request to the ENUM server 20, where the IP PBX identity query request carries the Called number.

The ENUM server 20 is configured to receive the IP PBX identity query request sent by the CSCF entity 10, obtain an IP PBX identifier corresponding to the called number according to the called number in the IP PBX identifier query request, and send the IP PBX identifier to the CSCF entity. 10: Send an IP PBX identifier query response, where the IP PBX identifier query response carries an IP PBX identifier corresponding to the called number, and the IP PBX identifier is used to identify an IP PBX.

The CSCF entity 10 is further configured to receive the IP PBX identity query response, send a second call request to the IP PBX according to the IP PBX identifier, and the second call request carries the called number.

FIG. 6 is a structural diagram of the CSCF entity 10 and the ENUM server 20 provided in this embodiment, as shown in FIG. As shown in FIG. 6, the CSCF entity 10 of the present invention includes: a receiving unit 101 and a transmitting unit 102. The ENUM server 20 includes: a receiving unit 201, a matching unit 202, and a transmitting unit 203.

The receiving unit 101 is configured to receive a first call request sent by the calling user equipment, where the first call request carries the called number.

When the calling user equipment in the IMS network initiates a call to the called user equipment, the receiving unit 101 receives the first call request sent by the calling user equipment, where the first call request is usually a SIP-based INVITE message, and the INVITE message is sent. Carry the called number.

The sending unit 102 is configured to send an IP PBX identity query request to the ENUM server 20, where the IP PBX identity query request carries the called number received by the receiving unit 101.

The receiving unit 201 of the ENUM server 20 is configured to receive an IP PBX identity query request sent by the CSCF entity 10, where the IP PBX identity query request carries the called number.

The matching unit 202 is configured to search for the IP PBX identifier corresponding to the called number according to the called number received by the receiving unit 201.

It should be noted that the ENUM server 20 pre-stores the mapping relationship between the phone number and the IP PBX identifier, and the IP PBX identifier is used to uniquely identify the corresponding IP PBX; the ENUM server 20 receives the called number according to the receiving unit 201. An IP PBX identifier corresponding to the called number can be obtained.

The ENUM server 20 may further include a saving unit (not shown), and the saving unit is configured to pre-store the mapping relationship between the called number and the IP PBX identifier, so that the matching unit 202 can find and obtain the called number according to the called number. The IP PBX ID corresponding to the number.

The sending unit 203 is configured to send an IP PBX identity query response to the CSCF entity 10, where the IP PBX identity query response carries the IP PBX identifier found by the matching unit 202. The receiving unit 101 is further configured to receive an IP PBX identifier query response sent by the ENUM server 20, where the IP PBX identifier query response carries an IP PBX identifier corresponding to the called number, and the IP PBX identifier is used to identify an IP PBX. .

The sending unit 102 is further configured to send a second call request to the IP PBX according to the IP PBX identifier received by the receiving unit 101, where the second call request carries the called number.

In this embodiment, the second call request sent by the sending unit 102 may further carry the IP PBX identifier, and the sending unit 102 may send the second call request by using the BCF entity. Specifically, the sending unit 102 first forwards the second call request carrying the called number and the IP PBX identifier to the BCF entity, and the BCF entity forwards the second call request to the SBC in the access side, according to the received The IP PBX identifier in the second call request finds the IP PBX corresponding to the called number, and routes the call to the IP PBX.

Embodiment 3

FIG. 7 is a structural diagram of a CSCF entity 10 according to the embodiment. As shown in FIG. 7, the CSCF entity 10 of the present invention includes: a wireless network interface 11, a processor 12, and a memory 13. The system bus 14 is used to connect the wireless network interface 11, the processor 12, and the memory 13.

The wireless network interface 11 is used to communicate with the ENUM server, the SBC of the access side, and the like.

The memory 13 may be a persistent storage such as a hard disk drive and a flash memory having a software module and a device driver therein. The software modules are capable of executing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.

At startup, these software components are loaded into memory 13 and then accessed by processor 12 and executed as follows:

Receiving a first call request sent by the calling user equipment, where the first call request carries the called number;

Sending an IP PBX identity query request to the phone number mapping ENUM server, where the IP PBX identity query request carries the called number; Receiving an IP PBX identifier query response sent by the ENUM server, where the IP PBX identifier query response carries an IP PBX identifier corresponding to the called number, and the IP PBX identifier is used to identify an IP PBX;

The CSCF entity in this embodiment can obtain the IP PBX identifier by pre-planning the mapping between the PBX number and the PBX on the ENUM server. The device on the core network side does not need to be modified to reduce the complexity of data configuration.

FIG. 8 is a structural diagram of an ENUM server according to the embodiment. As shown in FIG. 8, the ENUM server 20 of the present invention includes: a wireless network interface 21, a processor 22, and a memory 23. The system bus 24 is used to connect the wireless network interface 21, the processor 22, and the memory 23.

The wireless network interface 21 is for communicating with a CSCF entity or the like on the core network side.

The memory 23 can be a persistent storage such as a hard disk drive and a flash memory having a software module and a device driver therein. The software modules are capable of executing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.

At startup, these software components are loaded into memory 23 and then accessed by processor 22 and executed as follows:

Receiving an IP PBX identity query request sent by the CSCF entity, where the IP PBX identity query request carries the called number;

And obtaining an IP PBX identifier corresponding to the called number according to the called number; sending an IP PBX identifier query response, where the IP PBX identifier query response carries an IP PBX identifier corresponding to the called number.

The IP PBX identifier includes an interface parameter of the IP PBX. The response of the querying the telephone exchange identifier is specifically a regular expression of the called number to the IP PBX identifier mapping.

The ENUM server of this embodiment pre-plans and configures the mapping between the PBX number and the PBX. Therefore, the core network element can obtain the identity of the IP PBX.

The method and system for implementing the call routing provided by the present invention, by pre-planning and configuring the mapping relationship between the PBX number and the PBX on the ENUM server, after the CSCF entity on the IMS core network side receives the call request, the CSCF entity queries the ENUM server, ENUM The server outputs the mapping relationship between the PBX number and the PBX in the form of a regular expression, so that the CSCF entity obtains the identifier of the IP PBX, solves the problem that the core network obtains the IP PBX identifier, and reduces the complexity of the data configuration, and is applicable to various IMS core networks. Portable.

It will be apparent to those skilled in the art that the present invention can be implemented in hardware, firmware implementation, or a combination thereof, as will be apparent to those skilled in the art. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated media. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disc, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of protection of computer readable media.

It should be noted that each embodiment in this specification is described in a progressive manner. The same similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the execution process of each unit specific function can be referred to the description of the method embodiment. The device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. , or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for implementing call routing, the method comprising:

The call routing method according to claim 1, wherein the method further comprises: the ENUM server pre-preserving a mapping relationship between the called number and the IP PBX identifier.

The call routing method according to claim 1 or 2, wherein the sending the second call request to the IP PBX according to the IP PBX identifier includes:

The call routing method according to any one of claims 1 to 3, wherein the IP PBX identifier includes the following interface parameters of the IP PBX: tgr and trunk-context.

5. A call session control function CSCF entity in an IP multimedia subsystem, wherein the CSCF entity comprises:

a receiving unit, configured to receive a first call request sent by a calling user equipment, where the first call request carries a called number;

a sending unit, configured to send an Internet Protocol user exchange to a phone number mapping ENUM server The IP PBX identifies the query request, and the IP PBX identifier query request carries the called number received by the receiving unit;

The CSCF entity according to claim 5, wherein the second call request sent by the sending unit further carries the IP PBX identifier.

The CSCF entity according to claim 5 or 6, wherein the IP PBX identifier comprises the following interface parameters of the IP PBX: tgr and trunk-context.

8. A telephone number mapping ENUM server, wherein the ENUM server comprises:

The ENUM server according to claim 8, further comprising: a saving unit, configured to pre-store a mapping relationship between the called number and the IP PBX identifier, so that the matching unit is configured according to the The called number, finds the IP PBX identifier corresponding to the called number.

10. The ENUM server according to claim 8, wherein the IP PBX identifier includes the following interface parameters of the IP PBX: tgr and trunk-context.

A system for implementing call routing, the system comprising: the call session control function CSCF entity according to any one of claims 5-7, and any one of claims 8-10 The ENUM server described in the claims.