CN110324812B - International roaming communication method, international gateway, application server and communication system - Google Patents

International roaming communication method, international gateway, application server and communication system Download PDF

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Publication number
CN110324812B
CN110324812B CN201910591514.1A CN201910591514A CN110324812B CN 110324812 B CN110324812 B CN 110324812B CN 201910591514 A CN201910591514 A CN 201910591514A CN 110324812 B CN110324812 B CN 110324812B
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called number
call request
operator
application server
belongs
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CN110324812A (en
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肖征荣
田新雪
张猛
马书惠
王东
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H04W8/28—Number portability ; Network address portability

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a first international roaming communication method based on group service, which comprises the following steps: inquiring a first called number with a short number in a form number in a first calling request to obtain a long number of the first called number; determining an initial registration operator to which the first called number belongs according to the long number of the first called number; sending a call request to an application server of an initial registration operator to which the first called number belongs; and when the query information indicates that the first called number is carried and transferred out, establishing communication with a network element of an operator to which the first called number is transferred. The invention also provides a second international roaming method, an international gateway server, an application server and a communication system. By using the first international roaming communication method, even if the user is in a roaming state and the called number carries the number for switching to the network, the group service can still be used, and the user experience is improved.

Description

International roaming communication method, international gateway, application server and communication system
Technical Field
The present invention relates to the field of communications, and in particular, to a first international roaming communication method based on a group service, a second international roaming communication method based on a group service, an international gateway server, an application server, and a communication system.
Background
With the development of science and technology, terminals (such as mobile phones and the like) become essential articles in life of people. And along with the continuous improvement of the living quality of people, higher requirements are made on the consumption experience.
Group service, that is, mobile Virtual Private Network (WVPN), provides a logical Private Network to some enterprises and groups using the resources of 2/3G/4G Network and fixed Network, so that these enterprises and groups open services to 2/3G/4G users and PSTN users in the Private Network.
The mobile virtual private network service can give preference to users in a group to a certain degree, and supports flexible numbering function, flexible number display function, flexible dialing mode, closed group user preference, external number group, external calling, flexible control calling, group blocking, user blocking, system forbidden dialing and the like.
However, when the group user is in the international roaming state, the mobile vpn service cannot be used. Especially, when the group user has carried the number to change the network, the mobile virtual private network service can not be used.
Disclosure of Invention
The invention aims to provide a first international roaming communication method based on group service, a second international roaming communication method based on group service, an international gateway server, an application server and a communication system. By the first international roaming communication method, even if the group user is in an international roaming state and the called number is ported out, the mobile virtual private network service can still be used.
In order to achieve the above object, as a first aspect of the present invention, there is provided a first international roaming communication method based on a group service, wherein the first international roaming communication method includes:
responding to a first call request sent by an international gateway of a foreign operator, and inquiring a first called number with a short number in the first call request to obtain a long number of the first called number;
determining an initial registration operator to which the first called number belongs according to the long number of the first called number;
sending a call request to an application server of an initial registration operator to which the first called number belongs so as to control the application server of the initial registration operator to which the first called number belongs to send query information for querying whether the first called number is carried and transferred out to a home location register of the initial registration operator to which the first called number belongs;
and when the query information indicates that the first called number is carried and transferred out, establishing communication with a network element of an operator to which the first called number is transferred.
Preferably, the step of querying the first called number with the short number in the first call request includes:
and acquiring the long number of the first called number sent by a service control point application server of an initial registration operator to which the first called number belongs.
Preferably, the step of determining the operator to which the first called number belongs according to the long number of the first called number comprises:
receiving a session initiation protocol uniform resource identifier of the first called number sent by a call session control function entity of a calling side;
and judging the initial registration operator to which the called number belongs according to the session initiation protocol uniform resource identifier of the first called number.
Preferably, the first international roaming communication method further includes:
and responding to a second call request, and routing the second call request to an international gateway server corresponding to a second calling number in the second call request.
As a second aspect of the present invention, there is provided a second international roaming communication method based on a group service, wherein the second international roaming communication method includes:
responding to a first call request, sending the first call request to a home location register of an initial registration operator to which the first called number belongs, and enabling the home location register receiving the first call request to inquire whether the first called number carries the number and transfers the number out through an interconnection border control function entity of the operator to which the home location register belongs, wherein the first call request is the first call request forwarded to an application server of the initial registration operator to which the first called number belongs in the first international roaming communication method provided by the invention.
As a third aspect of the present invention, there is provided an international gateway server based on a group service, wherein the international gateway server includes:
the query module is used for responding to a first call request sent by an international gateway of a foreign operator, and querying a first called number with a short number in the first call request to obtain a long number of the first called number;
the operator determining module is used for determining an initial registration operator to which the first called number belongs according to the long number of the first called number;
a call request sending module, configured to send a call request to an application server of an initial registration operator to which the first called number belongs, so as to control the application server of the initial registration operator to which the first called number belongs to send the first call request to a home location register of the initial registration operator to which the first called number belongs, and enable the home location register that receives the first call request to query, through an interconnection border control function entity of the operator to which the home location register belongs, whether the first called number carries a number and is transferred out;
a communication establishing module, configured to establish communication with a network element of an operator to which the first called number is transferred when receiving query information indicating that the first called number has been ported.
Preferably, the query module is configured to obtain a long number of the first called number, which is sent by a service control point application server of an initial registration operator to which the first called number belongs.
Preferably, the operator determining module is configured to receive a session initiation protocol uniform resource identifier of the first called number sent by a call session control function entity of a calling side, and determine, according to the session initiation protocol uniform resource identifier of the first called number, an initial registered operator to which the called number belongs.
Preferably, the call request sending module is further configured to, in response to a second call request, route the second call request to an international gateway server corresponding to a second calling number in the second call request.
As a fourth aspect of the present invention, an application server is provided, wherein the application server is configured to send, in response to a first call request, query information for querying whether the first called number is ported out with a number to a home location register of an initial registration operator to which the first called number belongs, where the first call request is a first call request forwarded by the international gateway office server provided in the present invention,
and the application server is also used for sending the query result corresponding to the query information to the international gateway server sending the first call request.
As a fifth aspect of the present invention, there is provided a communication system comprising a plurality of international gateway servers belonging to a plurality of operators in a plurality of countries, respectively, a plurality of home location registers belonging to a plurality of operators in a plurality of countries, respectively, a plurality of application servers belonging to a plurality of operators in a plurality of countries, respectively, and a plurality of interconnection border control function entities belonging to a plurality of operators in a plurality of different countries, respectively, wherein the international gateway servers are the above-mentioned international gateway servers provided by the present invention, the application servers are the above-mentioned application servers provided by the present invention, the home location registers are configured to respond to query information sent by the application servers and send query results to the corresponding application servers,
and the interconnection boundary control function entity is used for routing the received call request to an interconnection boundary control function entity of an operator to which the called number is transferred in the call request after receiving the call request related to the called number portability.
Preferably, the communication system further includes a plurality of phone number mapping servers/domain name systems, a plurality of service control point application servers, and a plurality of call session control function entities, the plurality of phone number mapping servers/domain name systems respectively belong to operators of different countries, the plurality of service control point application servers respectively belong to a plurality of operators of a plurality of countries, and the plurality of call session control function entities respectively belong to a plurality of operators of a plurality of countries;
the service control point application server is used for responding to a query request sent by an international gateway server of the country to which the service control point application server belongs, and querying a long number corresponding to the first called number from a telephone number mapping server/domain name system of the same country as the service control point application server;
the call session control function entity is used for receiving a call request, wherein the call request comprises a first call request and a second call request, and the call session control function entity is also used for sending the received call request to an interconnection border control function entity and a home location register which belong to the same operator as the call session control function entity.
The first international roaming communication method provided by the invention is executed by the international gateway server. When a group user having a first calling number dials a short number in a overseas roaming state, an international gateway server of a foreign operator first routes a call request to the international gateway server of the operator for the first calling number. The international gateway office server inquires the first called number, acquires a long number corresponding to the first called number, inquires whether the first called number carries a number and transfers the number out, and finally completes subsequent access. Therefore, the group user transacting the group service can communicate with the group user who has carried out number portability and roll-out of the same operator in China when carrying out international roaming, and the user experience is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of an international roaming communication method provided by the present invention;
FIG. 2 is a block diagram of a gateway server according to the present invention;
fig. 3 is a block diagram of a communication system provided by the present invention.
Description of the reference numerals
210: the query module 220: operator determination module
230: the call request sending module 310: international gateway server
320: telephone number mapping server/domain name system
330: service control point application server 340: call session control function entity
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As an aspect of the present invention, there is provided a first international roaming communication method based on a group service, wherein as shown in fig. 1, the first international roaming communication method includes:
in step S110, in response to a first call request sent by an international gateway of a foreign operator, a first called number with a short number in the first call request is queried to obtain a long number of the first called number;
in step S120, determining an initial registration operator to which the first called number belongs according to the long number of the first called number;
in step S130, a call request is sent to an application server of an initial registration operator to which the first called number belongs, so as to control the application server of the initial registration operator to which the first called number belongs to send query information for querying whether the first called number is ported out with a number to a home location register of the initial registration operator to which the first called number belongs;
in step S140, when the query information indicates that the first called number has been ported out, a communication is established with a network element of an operator to which the first called number is ported.
It should be noted that the first international roaming communication method provided by the present invention is performed by the international gateway server. When a group user having a first calling number dials a short number in a overseas roaming state, an international gateway server of a foreign operator first routes a call request to the international gateway server of the operator for the first calling number. The international gateway office server inquires the first called number, acquires a long number corresponding to the first called number, inquires whether the first called number carries a number and transfers the number out, and finally completes subsequent access. Therefore, the group user transacting the group service can communicate with the group user who has carried out number portability and roll-out of the same operator in China when carrying out international roaming, and the user experience is improved.
It is noted that "initial registration operator" means an operator handling the first called number. When the first called number has already dealt with the number portability and roll out, the initial registration operator refers to the operator before the first called number portability and roll out.
And after receiving the first call request, the application server of the initial registration operator to which the first called number belongs sends a query request to a home location register of the initial registration operator. And the home location register of the initial registered operator sends a query result (the query result comprises two types, namely a first type, operator information which is carried and forwarded, and a second type, operator information which is not carried and forwarded) back to the application server.
And then the application server feeds back the query result to the international gateway server sending the first call request.
When the international gateway server sending the first call request receives a query result of number portability of a first called number, normally establishing call connection with a network element (for example, a call session control entity) of an initial registration operator of the first called number; when the international gateway server sending the first call request receives a query result that the first called number is already ported out with a number, communication is established with a network element (for example, a call session control entity) of an operator to which the first called number is ported.
As a preferred embodiment of the present invention, in step S110, the querying the first called number whose formal number is a short number in the first call request includes:
and acquiring the long number of the first called number sent by a service control point application server of an initial registration operator to which the first called number belongs.
All user information (including a long number and a short number of a mobile phone corresponding to a user) in the group service is stored in the service control point application server, and the long number corresponding to the first called number can be quickly obtained by inquiring in the service control point application server.
Preferably, step S130 may include:
receiving a Session Initiation Protocol Uniform Resource Identifier (SIP URI) of the first called number sent by a call Session control function entity of a calling side;
and judging the initial registration operator to which the called number belongs according to the SIP URI of the first called number.
Preferably, the first international roaming communication method further includes:
and responding to a second call request, and routing the second call request to an international gateway server corresponding to a second calling number in the second call request.
That is, the international gateway server can process not only a call request of a subscriber roaming from the home country to the foreign country but also a call request of a subscriber roaming from the foreign country to the home country.
As a second aspect of the present invention, there is provided a second international roaming communication method based on a group service, wherein the second international roaming communication method includes:
responding to a first call request, sending the first call request to a home location register of an initial registration operator to which the first called number belongs, and enabling the home location register receiving the first call request to inquire whether the first called number carries the number and transfers the number out through an interconnection border control function entity of the operator to which the home location register belongs, wherein the first call request is the first call request forwarded to an application server of the initial registration operator to which the first called number belongs in the first international roaming communication method provided by the invention.
The first international roaming communication method provided by the invention is executed by an international gateway server, and the second international roaming communication method provided by the invention is executed by an application server of an operator.
After receiving a first call request sent by an international gateway server of an operator corresponding to a first calling number, an application server of an initial registration operator to which a first called number belongs sends the first call request to a home location register of the initial registration operator to which the first called number belongs, so as to execute an operation of inquiring whether the first called number is carried and transferred out. And after receiving the query result, the application server of the initial registration operator to which the first called number belongs forwards the query result to the international gateway server of the operator to which the first calling number belongs.
As a third aspect of the present invention, there is provided an international gateway server based on a group service, wherein, as shown in fig. 2, the international gateway server includes an inquiry module 210, an operator determination module 220, a call request transmission module 230, and a communication establishment module 240.
The query module 210 is configured to execute step S110, that is, the query module 210 is configured to, in response to a first call request sent by an international gateway office of a foreign operator, query a first called number, of which a formal number is a short number, in the first call request to obtain a long number of the first called number.
The operator determining module 220 is configured to perform step S120, that is, the operator determining module is configured to determine an initial registration operator to which the first called number belongs according to the long number of the first called number.
The call request sending module 230 is configured to execute step S130, that is, the call request sending module 220 is configured to send a call request to an application server of an initial registration operator to which the first called number belongs, so as to control the application server of the initial registration operator to which the first called number belongs to send the first call request to a home location register of the initial registration operator to which the first called number belongs, and enable the home location register that receives the first call request to query whether the first called number is transferred out with number through an interconnection border control function entity of the operator to which the home location register belongs.
The communication establishing module 240 is configured to execute step S140, that is, the communication establishing module 240 is configured to establish a communication with a network element of an operator to which the first called number is transferred when receiving the query information indicating that the first called number has been ported.
The international gateway server provided by the present invention is configured to execute the first international roaming communication method provided by the present invention, and the working principle and the beneficial effects of the first international roaming communication method have been described in detail above, and are not described again here.
As a preferred embodiment, the query module 210 is configured to obtain a long number of the first called number, which is sent by a service control point application server of an initial registration operator to which the first called number belongs.
As a preferred embodiment of the present invention, the operator determining module 220 is configured to receive an SIP URI of the first called number sent by a call session control function entity of a calling side, and determine an initial registered operator to which the called number belongs according to the SIP URI of the first called number.
As described above, the international gateway server can process not only the call request of the subscriber roaming from the home country to the foreign country but also the call request of the subscriber roaming from the foreign country to the home country. Correspondingly, the call request sending module 230 is further configured to, in response to the second call request, route the second call request to an international gateway server corresponding to the second calling number in the second call request.
As a fourth aspect of the present invention, an application server is provided, where the application server is configured to send, in response to a first call request, query information for querying whether the first called number is ported to a home location register of an initial registration operator to which the first called number belongs, where the first call request is a first call request forwarded by the international gateway office server provided in the present invention.
In addition, the application server is further configured to send a query result corresponding to the query information to an international gateway server that sends the first call request.
The application server provided by the present invention is configured to execute the second international roaming communication method provided by the second aspect of the present invention.
As a fifth aspect of the present invention, there is provided a communication system, as shown in fig. 3, including a plurality of international gateway servers 310, a plurality of home location registers 320, a plurality of application servers 330, and a plurality of interconnection border control function entities 340, the plurality of international gateway servers 310 respectively belonging to a plurality of operators of a plurality of countries, the plurality of home location registers 320 respectively belonging to a plurality of operators of a plurality of countries, the plurality of application servers 330 respectively belonging to a plurality of operators of a plurality of countries, and the plurality of interconnection border control function entities 340 respectively belonging to a plurality of operators of a plurality of different countries. The international gateway server 310 is the international gateway server provided by the present invention, the application server 330 is the application server provided by the present invention, and the home location register 320 is configured to respond to the query information sent by the application server 330 and send a query result to the corresponding application server 330. Here, the "corresponding application server" refers to an application server that transmits the query information.
The interconnection border control function 340 is configured to, after receiving a call request related to number portability of a called number, route the received call request to an interconnection border control function of an operator to which the called number is ported in the call request.
Preferably, the communication system further comprises a plurality of telephone number mapping servers/domain name systems 350, a plurality of service control point application servers 360 and a plurality of call session control function entities 370. Wherein, the plurality of phone number mapping servers/domain name systems 350 respectively belong to operators of different countries, the plurality of service control point application servers 360 respectively belong to a plurality of operators of a plurality of countries, and the plurality of call session control function entities 370 respectively belong to a plurality of operators of a plurality of countries;
the service control point application server 330 is configured to respond to a query request sent by the international gateway server of the country of the service control point application server, and query a long number corresponding to the first called number to a telephone number mapping server/domain name system belonging to the same country as the service control point application server.
The call session control function 340 is configured to receive the call invitation information (i.e., the call request, which includes the first call request and the second call request). The call session control function 340 is further configured to send the received call request to an interworking border control function and a home location register belonging to the same operator as the call session control function.
The following describes how the communication system performs the above-mentioned first and second international roaming communication methods based on a group service provided by the present invention.
The VoLTE user needs to complete the registration and authentication process when registering the IMS domain abroad. A VoLTE calling user needs to complete a corresponding basic calling process before talking with a called party, and the SIP related signaling flow in the VoLTE calling establishment is the same as the flow of a normal IMS calling; the voice bearer needs to be established in the calling process, after the bearer is established, an update message needs to be sent to a called side, a VoLTE user roams abroad and is registered to an IMS domain as a calling party, and the calling process of the user which calls the home and is registered in the IMS domain is as follows:
the calling user dials the short number of the called user, and the terminal of the calling user initiates a service request message to the base station;
the base station forwards the service request message to the mobile management entity;
the security procedure may be performed according to the policy of the operator.
The mobile management entity initiates a wireless connection establishment request to the base station and sends a user terminal message;
the base station establishes a related radio bearer;
a user terminal sends an uplink data invitation message to a base station;
the base station forwards the invitation message to a service gateway;
the service gateway transmits the invitation message to the proxy gateway;
the service gateway transmits the invitation message to a call session control function entity;
the base station replies a wireless connection establishment request response message to the mobile management entity;
the mobile management entity sends a bearing modification message to the service gateway, and the service gateway can send downlink data to the base station;
the service gateway determines whether to initiate a bearer modification process to the proxy gateway based on the subscription condition;
the proxy gateway replies a bearing modification response message to the service gateway;
the service gateway replies a bearing modification response message to the mobile management entity;
the call session control function entity sends the call message invitation to the network side;
the calling session control function entity triggers a calling side application server according to the subscription information of a calling user, wherein the calling number is a long number, and the called number is a V-network short number;
the application server sends a call invitation (INVITE) message to a call session control function entity to route the called party, wherein the call invitation message comprises a short number requesting that the same resource identifier (REQUEST URI) is the called party;
a calling session control function entity triggers a calling side service control point application server according to subscription information of a calling user, carries a calling number and a called number, wherein the calling number is a long number, and the called number is a V-network short number; the service control point application server checks that the calling user is a VPN group user;
according to the called user number and the calling group number, determining that the call is an intra-group call;
inquiring the long and short number comparison table to obtain the long number IP Multimedia Public user Identity (IMPU, IP Multimedia Public Identity) of the called user;
the service control point application server sends an INVITE message to the call session control function entity, where the REQUEST URI is the real number (long number) of the called subscriber.
At this time, the call session control function entity initiates an inquiry to the telephone number mapping server/domain name system, and inquires the name authority pointer record of the called number. The telephone number mapping server/domain name system will return the domain name carrying the operator identification and province label, the user number part starts with the routing code, then the call session control function entity routes the call to the interworking network element of IMS and other networks according to the called domain name. The calling side call session control function entity sends the INVITE message to an international gateway server according to the SIP URI of the called user, and the international gateway judges which operator the called user belongs to according to the SIP URI.
The international gateway office sends the INVITE message to the international gateway office corresponding to the operator to which the called party belongs, and then the international gateway office of the domestic operator sends the INVITE message to the call session control function entity where the called party is located.
A call session control function entity where a called user is located sends an IVITE message to an application server;
the application server forwards the message to the home location register, and the home location register replies the message that the called user has already carried the number and switched to the network, so that the application server replies the message to the call session control function entity after receiving the query response message;
the call session control function entity sends an INVITE message to an interconnection border control function entity (IBCF);
the IBCF routes the message to the IBCF of the operator after the number portability, and the IBCF of the operator after the number portability forwards the message to the call session control function entity after the called user number portability.
A calling session control function entity of an operator to which a called number is transferred sends media information to an application server of the operator to which the called number is transferred;
the application server of the operator to which the called number is transferred inquires the number carrying home location register of the operator to which the called number is transferred to select the terminal access domain, and the domain is selected to the IMS domain
And the session call control function entity of the operator to which the called number is transferred carries out a call connection process. And after receiving the INVITE request, the call session control function entity of the operator to which the called number is transferred triggers the call to a service control point application server of the operator to which the called number is transferred according to the signed information of the called user.
After receiving the INVITE message, the service control point application server of the operator to which the called number is transferred acquires the calling number from the message, judges that the calling user dials the short number through the domain, and the called user displays the short number;
a service control point application server of an operator to which a called number is transferred sends an UDR to an HSS of the operator to which the called number is transferred to inquire the position information of a called user;
and the service control point application server of the operator to which the called number is transferred sends an INVITE message to a call session control function entity of the operator to which the called number is transferred to route the called, if the short number is displayed, the short number of the calling user is modified, and the PAI is the real number of the calling user.
The calling session control function entity of the operator to which the called number is transferred triggers an application server of the operator to which the called number is transferred, the application server of the operator to which the called number is transferred provides basic service and routing domain selection, and finally the called UE-B is routed; after receiving the INVITE message, the UE-B preferentially displays the V network short number according to the FROM header field;
establishing a session through subsequent message interaction of 180ringing, PRACK \200OK, 200OK and the like;
the calling session control function entity of the operator to which the called number is transferred sends a called response message 200OK to the calling UE-A, and the calling UE-A sends a BYE message
And after receiving the BYE message, the service control point application server of the operator to which the called number is transferred writes a ticket and releases the session.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A second international roaming communication method based on a group service, characterized in that the second international roaming communication method comprises:
responding to a first call request, sending the first call request to a home location register of an initial registration operator to which a first called number belongs, and enabling the home location register receiving the first call request to inquire whether the first called number carries out the number transfer out or not through an interconnection border control function entity of the operator to which the home location register belongs, wherein the first call request is forwarded to an application server of the initial registration operator to which the first called number belongs through a first international roaming communication method;
wherein the first international roaming communication method includes:
responding to a first call request sent by an international gateway of a foreign operator, and inquiring a first called number with a short number in the first call request to obtain a long number of the first called number;
determining an initial registration operator to which the first called number belongs according to the long number of the first called number;
sending a call request to an application server of an initial registration operator to which the first called number belongs so as to control the application server of the initial registration operator to which the first called number belongs to send query information for querying whether the first called number is carried and transferred out to a home location register of the initial registration operator to which the first called number belongs;
and when the query information indicates that the first called number is carried and transferred out, establishing communication with a network element of an operator to which the first called number is transferred.
2. The second international roaming communication method of claim 1, wherein the step of querying the first called number of the first call request whose formal number is a short number includes:
and acquiring the long number of the first called number sent by a service control point application server of an initial registration operator to which the first called number belongs.
3. The second international roaming communication method of claim 1 or 2, wherein the step of determining an operator to which the first called number belongs according to the long number of the first called number includes:
receiving a session initiation protocol uniform resource identifier of the first called number sent by a call session control function entity of a calling side;
and judging the initial registration operator to which the called number belongs according to the session initiation protocol uniform resource identifier of the first called number.
4. The second international roaming communication method of claim 1 or 2, wherein the first international roaming communication method further includes:
and responding to a second call request, and routing the second call request to an international gateway server corresponding to a second calling number in the second call request.
5. An application server, wherein the application server is configured to send, in response to a first call request, query information for querying whether a first called number is ported out or not to a home location register of an initial registration operator to which the first called number belongs, wherein the first call request is a first call request forwarded through an international gateway server,
the application server is also used for sending the query result corresponding to the query information to an international gateway server which sends the first call request;
wherein, the international gateway server comprises:
the query module is used for responding to a first call request sent by an international gateway of a foreign operator, and querying a first called number with a short number in the first call request to obtain a long number of the first called number;
the operator determining module is used for determining an initial registration operator to which the first called number belongs according to the long number of the first called number;
a call request sending module, configured to send a call request to an application server of an initial registration operator to which the first called number belongs, so as to control the application server of the initial registration operator to which the first called number belongs to send the first call request to a home location register of the initial registration operator to which the first called number belongs, and enable the home location register that receives the first call request to query, through an interconnection border control function entity of the operator to which the home location register belongs, whether the first called number carries a number and is transferred out;
a communication establishing module, configured to establish communication with a network element of an operator to which the first called number is transferred when receiving query information indicating that the first called number has been ported.
6. The application server according to claim 5, wherein the query module is configured to obtain a long number of the first called number sent by a service control point application server of an initial licensed operator to which the first called number belongs.
7. The application server according to claim 5 or 6, wherein the operator determining module is configured to receive a session initiation protocol uniform resource identifier of the first called number sent by a call session control function entity of a calling side, and determine, according to the session initiation protocol uniform resource identifier of the first called number, an initial registration operator to which the called number belongs.
8. The application server according to claim 5 or 6, wherein the call request sending module is further configured to route the second call request to an international gateway server corresponding to the second calling number in the second call request, in response to the second call request.
9. A communication system comprising a plurality of International gateway servers belonging to a plurality of operators in a plurality of countries, respectively, a plurality of Home location registers belonging to a plurality of operators in a plurality of countries, respectively, a plurality of application servers belonging to a plurality of operators in a plurality of countries, respectively, and a plurality of interconnection Border control function entities belonging to a plurality of operators in a plurality of different countries, respectively, wherein the application servers are the application servers according to any one of claims 5 to 8, the Home location registers being adapted to respond to inquiry information sent by the application servers and to send inquiry results to the corresponding application servers,
and the interconnection boundary control function entity is used for routing the received call request to an interconnection boundary control function entity of an operator to which the called number is transferred in the call request after receiving the call request related to the called number portability.
10. The communication system according to claim 9, wherein the communication system further comprises a plurality of telephone number mapping servers/domain name systems respectively belonging to operators of different countries, a plurality of service control point application servers respectively belonging to a plurality of operators of a plurality of countries, and a plurality of call session control function entities respectively belonging to a plurality of operators of a plurality of countries;
the service control point application server is used for responding to a query request sent by an international gateway server of the country to which the service control point application server belongs, and querying a long number corresponding to the first called number from a telephone number mapping server/domain name system of the same country as the service control point application server;
the call session control function entity is used for receiving a call request, wherein the call request comprises a first call request and a second call request, and the call session control function entity is also used for sending the received call request to an interconnection border control function entity and a home location register which belong to the same operator as the call session control function entity.
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