CN108769915A - International roaming method for limiting and system - Google Patents

Abstract

The invention discloses an international roaming restriction method and system. The method includes: the terminal sends a registration message to the CSCF, and the registration message includes the service type and the terminal access state; if the CSCF judges that the service type is VoWiFi, judges whether the terminal access state is a cellular network mode; if the CSCF judges that the terminal access When the state is in the cellular network mode, judge whether to allow the terminal to roam in the roaming area according to the obtained VLR information. If it is judged that the terminal is allowed to roam in the roaming area, the VoWiFi service registration of the terminal is allowed, and if it is judged that the terminal is not allowed to roam in the roaming area, it is rejected. VoWiFi service registration of the terminal; if the CSCF judges that the terminal access status is not in the cellular network mode, it judges whether to allow the terminal to roam in the roaming area according to the acquired location information, and if it determines that the terminal is allowed to roam in the roaming area, the VoWiFi service registration of the terminal is allowed , if it is determined that the terminal is not allowed to roam in the roaming area, the VoWiFi service registration of the terminal is refused. The present invention realizes the restriction on VoWiFi roaming service.

Description

International Roaming Restriction Method and System

technical field

The invention relates to the field of communication technology, in particular to a method and system for restricting international roaming.

Background technique

Voice over WiFi (also called WiFi calling) means that users use smart terminals with VoWiFi capabilities to make voice and video calls through traditional dial-up methods in a Wi-Fi environment. VoWiFi is a voice service provided by an IP Multimedia Subsystem (IP Multimedia Subsystem, IMS for short) network through Wi-Fi access.

When a user uses the VoWiFi service, the terminal accesses the local IMS network via the Internet through the local WiFi network, so no roaming settlement fee (such as: international roaming scenario) is generated, which reduces the cost of roaming services and facilitates operators to provide cheaper international services. Roaming service. Users can choose whether to sign up for VoWiFi roaming service. When users do not sign up for VoWiFi international roaming service, operators need to restrict VoWiFi service roaming.

In the prior art, roaming restrictions on users can be realized by distinguishing between trusted WLANs and untrusted WLANs: when a user accesses an untrusted WLAN, use of VoWiFi is restricted. However, this solution still has disadvantages: when a user accesses a trusted network through a proxy server, for example, the user does not sign up for VoWiFi international roaming service, but accesses the trusted network through a proxy server, the operator cannot identify and restrict the use of VoWiFi roaming service.

Contents of the invention

The invention provides an international roaming restriction method and system, which are used to realize the restriction on VoWiFi roaming service.

To achieve the above purpose, the present invention provides a method for restricting international roaming, including:

The terminal sends a registration message to the CSCF, and the registration message includes the service type and the terminal access status;

If the CSCF determines that the service type is VoWiFi, it determines whether the terminal access state is a cellular network mode;

If the CSCF determines that the terminal's access status is the cellular network mode, it judges whether to allow the terminal to roam in the roaming area according to the acquired VLR information, and if it determines that the terminal is allowed to roam in the roaming area, the VoWiFi of the terminal is allowed Service registration, if it is determined that the terminal is not allowed to roam in a roaming area, rejecting the VoWiFi service registration of the terminal;

If the CSCF judges that the terminal access state is not in the cellular network mode, judge whether to allow the terminal to roam in the roaming area according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming area, allow the VoWiFi of the terminal For service registration, if it is determined that the terminal is not allowed to roam in a roaming location, the VoWiFi service registration of the terminal is refused.

Optionally, the registration message also includes an account number and a password;

Before the CSCF judges whether the service type is VoWiFi, it also includes:

CSCF verifies whether the account number and password are correct;

If the CSCF verifies that the account number and password are correct, continue to execute the step of judging whether the service type is VoWiFi.

Optionally, if the CSCF determines that the terminal access state is in cellular network mode, it determines whether to allow the terminal to roam in a roaming location according to the acquired VLR information, and if it determines that the terminal is allowed to roam in a roaming location Allowing the VoWiFi service registration of the terminal, and rejecting the VoWiFi service registration of the terminal if it is determined that the terminal is not allowed to roam in a roaming area includes:

The CSCF inquires from the HSS that the service number of the terminal has subscribed to the VoWiFi roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges whether the preset first roaming address library includes VLR information, and if Allowing the VoWiFi service registration of the terminal when it is determined that the preset first roaming address library includes VLR information, and rejecting the VoWiFi service registration of the terminal if it is determined that the preset first roaming address library does not include VLR information; or,

The CSCF inquires from the HSS that the service number of the terminal has signed a VoWiFi service. The VoWiFi service includes the VoWiFi roaming service or the VoWiFi non-roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges the preset Whether the first domestic address database includes VLR information, if it is judged that the preset first domestic address database includes VLR information, the VoWiFi service registration of the terminal is allowed, if it is judged that the preset first domestic address database does not include VLR information rejecting the VoWiFi service registration of the terminal; or,

The CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges whether the preset first roaming address library includes VLR information, and if If it is determined that the preset first roaming address database includes VLR information, the VoWiFi service registration of the terminal is rejected, and if it is determined that the preset first roaming address database does not include VLR information, the VoWiFi service registration of the terminal is allowed.

Optionally, the service registration message also includes location information;

If the CSCF judges that the terminal access state is not in the cellular network mode, judge whether to allow the terminal to roam in a roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in a roaming location, allow the terminal to VoWiFi service registration, if it is determined that the terminal is not allowed to roam in a roaming area, rejecting the VoWiFi service registration of the terminal includes:

The CSCF inquires from the HSS to find out that the service number of the terminal has signed a VoWiFi roaming service; the CSCF judges whether the preset second roaming address database includes location information, and allows the terminal if it determines that the preset second roaming address database includes location information. VoWiFi service registration, rejecting the VoWiFi service registration of the terminal if it is determined that the preset second roaming address library does not include location information; or,

The CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF judges whether the preset second roaming address library includes location information, and rejects the terminal if it determines that the preset second roaming address library includes location information VoWiFi service registration, if it is determined that the preset second roaming address library does not include location information, the VoWiFi service registration of the terminal is allowed; or,

The CSCF inquires from the HSS that the service number of the terminal has signed a VoWiFi service. The VoWiFi service includes the VoWiFi roaming service or the VoWiFi non-roaming service; the CSCF judges whether the preset second domestic address database includes location information. When the second domestic address database includes location information, the VoWiFi service registration of the terminal is allowed, and if it is judged that the preset second domestic address database does not include VLR information, the VoWiFi service registration of the terminal is rejected.

Optionally, after allowing the VoWiFi service registration of the terminal, it also includes:

The CSCF sends a registration permission message to the terminal;

CSCF sends a third-party registration request to MMTel AS;

The MMTel AS sends a registration success message to the CSCF.

Optionally, after rejecting the VoWiFi service registration of the terminal, it further includes:

The CSCF sends a registration rejection message to the terminal.

To achieve the above purpose, the present invention provides an international roaming restriction system, including: a terminal and a CSCF;

The terminal is configured to send a registration message to the CSCF, where the registration message includes a service type and a terminal access status;

The CSCF is configured to determine whether the terminal access state is in the cellular network mode if it is determined that the service type is VoWiFi; if the CSCF determines that the terminal access state is in the cellular network mode, determine based on the acquired VLR information Whether to allow the terminal to roam in a roaming location, if it is determined that the terminal is allowed to roam in a roaming location, the VoWiFi service registration of the terminal is allowed, and if it is judged that the terminal is not allowed to roam in a roaming location, reject the VoWiFi service of the terminal Service registration; if the CSCF judges that the terminal access status is not in the cellular network mode, judge whether to allow the terminal to roam in the roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming location, allow the For the VoWiFi service registration of the terminal, if it is determined that the terminal is not allowed to roam in a roaming area, the VoWiFi service registration of the terminal is rejected.

Optionally, the registration message also includes an account number and a password;

The CSCF is also used to verify whether the account number and password are correct; if the account number and password are verified to be correct, continue to execute the step of judging whether the service type is VoWiFi.

Optionally, it also includes: MMTel AS;

The CSCF is also used to send a registration permission message to the terminal; send a third-party registration request to the MMTel AS;

The MMTel AS is also used to send a registration success message to the CSCF.

Optionally, the CSCF is further configured to send a registration rejection message to the terminal.

The present invention has the following beneficial effects:

In the technical solution of the international roaming restriction method and system provided by the present invention, the CSCF judges whether the terminal access status is the cellular network mode; if the CSCF judges that the terminal access status is the cellular network mode, according to the acquired VLR information judging whether the terminal is allowed to roam in the roaming location, if it is judged that the terminal is allowed to roam in the roaming location, the VoWiFi service registration of the terminal is allowed, and if it is judged that the terminal is not allowed to roam in the roaming location, rejecting the registration of the terminal VoWiFi service registration; if the CSCF judges that the terminal access status is not in the cellular network mode, it judges whether to allow the terminal to roam in the roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming location VoWiFi service registration of the terminal, if it is determined that the terminal is not allowed to roam in a roaming area, rejecting the VoWiFi service registration of the terminal. The present invention realizes the restriction on VoWiFi roaming service.

Description of drawings

FIG. 1 is a schematic structural diagram of a network system in an embodiment of the present invention;

FIG. 2 is a flow chart of a method for restricting international roaming of an IMS voice service according to Embodiment 1 of the present invention;

FIG. 3 is a flow chart of a method for restricting international roaming provided by Embodiment 2 of the present invention;

Fig. 4 is the flow chart of VoWiFi call out method in the embodiment of the present invention;

FIG. 5 is a flowchart of a VoWiFi incoming call method in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an international roaming restriction system provided by Embodiment 3 of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the international roaming restriction method and system provided by the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a network system in an embodiment of the present invention. As shown in FIG. 1 , the network system includes: an IMS network and an SS7 network. The IMS network includes three parts: an IMS core network (IMS Core), an access network and terminals. The IMS core network is responsible for functions such as service registration, VoWiFi service triggering and prohibition, and message distribution. The Multimedia Telephony Application Server (MMTel AS for short) is the control device for audio and video call services, responsible for call connection and management. The access network Responsible for terminal access control, signaling and media transmission, etc. The terminal can use the same IMS account to access the IMS core network through the IMS access point (APN) or Internet APN, and supports the VoWiFi calling function, and the VoWiFi service is directly connected through the Internet To the boundary device session border controller (SessionBorder Controller, be called for short SBC) of IMS core network.Roaming state server links to each other with the home location register (HomeLocation Register, being called for short HLR) of SS7 network on one side, inquires the international roaming state of the business number of this terminal, Corresponding VLR information; one side is connected to the call session control function (Call Session Control Function, CSCF for short) of the IMS network, and provides roaming status and roaming location information of the service number of the terminal.

The following embodiments provided by the present invention can be implemented based on the network system in FIG. 1 .

Fig. 2 is a flowchart of a method for restricting international roaming of an IMS voice service provided by Embodiment 1 of the present invention. As shown in Fig. 2, the method includes:

Step 101, the terminal sends a registration message to the CSCF, and the registration message includes the service type and the terminal access status.

Step 102, if the CSCF judges that the service type is VoWiFi, judge whether the terminal access state is in cellular network mode, if yes, execute step 103; if not, execute step 104.

Step 103, the CSCF judges whether the terminal is allowed to roam in the roaming area according to the obtained VLR information, if yes, execute step 105; if not, execute step 106.

Step 104, the CSCF judges whether the terminal is allowed to roam in the roaming area according to the acquired location information, if yes, execute step 105; if not, execute step 106.

Step 105, the CSCF allows the VoWiFi service registration of the terminal, and the process ends.

Step 106, rejecting the VoWiFi service registration of the terminal, and the flow ends.

Fig. 3 is a flowchart of a method for restricting international roaming provided by Embodiment 2 of the present invention. As shown in Fig. 3, the method includes:

Step 201, the terminal sends a service registration message to the CSCF, the service registration message includes account number, password, service type and terminal access status.

In each embodiment of the present invention, when information is exchanged between the terminal and the CSCF, it is forwarded through the SBC.

In this embodiment, when the terminal is located abroad, it sends a service registration message to the CSCF.

In this embodiment, the service type may include VoWiFi or VoLTE, and the terminal access state may include a cellular network mode or a non-cellular network mode, wherein the non-cellular network mode may be an airplane mode.

In this embodiment, the service registration message can be a Session Initiation Protocol (Session Initiation Protocol, referred to as SIP) message, the "service-type" in the "contact" field in the service registration message indicates the service type, and the "contact" in the service registration message "access-state" in the field indicates the terminal access state. Wherein, "service-type" may be VoWiFi or VoLTE, and "access-state" is a cellular network mode (cellular) or a non-cellular network mode (non-cellular).

Further, after step 201, it also includes: the CSCF sends 401 an authentication response to the terminal; the terminal sends a service registration message carrying authentication information to the CSCF, and continues to execute step 202.

Step 202, the CSCF verifies whether the account number and password are correct, if not, execute step 203, and if yes, execute step 204.

Step 203, the CSCF sends a registration error message to the terminal, and the process ends.

In this embodiment, if the CSCF verifies that the account number and password are incorrect, and rejects the terminal's service registration message, step 203 is performed. Wherein, the registration error message may be a 404 response message.

Step 204, CSCF judges whether the service type is VoWiFi, if yes, execute step 205; if not, execute step 214.

In this embodiment, if the CSCF determines that the service type is VoWiFi, perform step 205; if the CSCF determines that the service type is VoLTE, perform step 214.

Step 205, the CSCF judges whether the terminal access status is the cellular network mode, if yes, execute step 206; if not, execute step 207.

In this embodiment, if the CSCF determines that the terminal access state is in the cellular network mode, step 206 is performed; if the CSCF determines that the terminal access state is in a non-cellular network mode (ie flight mode), step 207 is performed.

Step 206, the CSCF judges whether the terminal is allowed to roam in the roaming area according to the obtained VLR information, if yes, execute step 208; if not, execute step 209.

Optionally, step 206 includes: the CSCF inquires from the Home Subscriber Server (HSS) that the service number of the terminal has subscribed to the VoWiFi roaming service; the CSCF obtains the VLR of the VLR connected to the terminal from the HSS through the roaming status server information; the CSCF judges whether the preset first roaming address database includes VLR information, and if it judges that the preset first roaming address database includes VLR information, execute step 208; if it judges that the preset first roaming address database does not include VLR information, execute step 209. In this case, the user subscribes to the VoWiFi roaming service, and the terminal is in a roaming state. In this embodiment, the first roaming address library includes VLR information corresponding to the roaming area.

In this embodiment, the CSCF acquires the VLR information of the VLR accessed by the terminal from the HSS through the roaming status server. Specifically, the CSCF may send a first VLR acquisition request to the roaming status server according to the service number of the terminal. The first VLR acquisition request is DIAMETER The request of agreement; The roaming status server converts the first VLR acquisition request into the second VLR acquisition request, and the second VLR acquisition request is a request of the MAP protocol; The roaming status server sends the second VLR acquisition request to the HLR; HLR sends the roaming status server Return the VLR information of the VLR connected to the terminal, the VLR information is the information of the MAP protocol; the roaming state server converts the VLR information of the MAP protocol into the VLR information of the DIAMETER protocol; the roaming state server sends the VLR information to the CSCF. In this case, the user subscribes to a VoWiFi service (VoWiFi roaming service or VoWiFi non-roaming service), and the terminal is in a non-roaming state. To sum up, in this embodiment, a roaming status server is set up, connected to the HLR through the MAP interface, and connected to the CSCF through the DIAMETER interface, so as to complete the query and return of the VLR information when the terminal accesses the cellular network.

Optionally, step 206 includes: the CSCF inquires from the HSS to find out that the service number of the terminal has subscribed to the VoWiFi service, and the VoWiFi service includes the VoWiFi roaming service or the VoWiFi non-roaming service; VLR information: CSCF judges whether the preset first domestic address database includes VLR information, if it is judged that the preset first domestic address database includes VLR information, execute step 208, if it judges that the preset first domestic address database does not include Step 209 is executed when the VLR information is displayed. In this case, the user has not subscribed to the VoWiFi roaming service, and the terminal is in the roaming state. In this embodiment, the first domestic address database includes location information corresponding to domestic regions.

Optionally, step 206 includes: the CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF determines the preset first roaming address Whether the library includes VLR information, if it is determined that the preset first roaming address library includes VLR information, perform step 209, and if it is determined that the preset first roaming address library does not include VLR information, perform step 208.

It should be noted that: if the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server, the CSCF allows the terminal to register for the VoWiFi service.

Step 207, the CSCF judges whether the terminal is allowed to roam in the roaming area according to the acquired location information, if yes, execute step 208; if not, execute step 209.

Optionally, the service registration message also includes location information, and step 207 includes: the CSCF inquires from the HSS to find out that the service number of the terminal has subscribed to the VoWiFi roaming service; the CSCF judges whether the preset second roaming address library includes location information, and if If it is determined that the preset second roaming address library includes the location information, step 208 is executed, and if it is determined that the preset second roaming address library does not include the location information, step 209 is executed. In this case, the user subscribes to the VoWiFi roaming service, and the terminal is in a roaming state. In this embodiment, the second roaming address library includes location information corresponding to the roaming area.

Optionally, the service registration message also includes location information, and step 207 includes: the CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF judges whether the preset second roaming address library includes location information, and if it determines If it is determined that the preset second roaming address library includes the location information, step 209 is executed, and if it is determined that the preset second roaming address library does not include the location information, step 208 is executed. In this case, the user has not subscribed to the VoWiFi roaming service, and the terminal is in the roaming state.

Optionally, the service registration message also includes location information, and step 207 includes: the CSCF inquires from the HSS to find out that the service number of the terminal has signed a VoWiFi service, and the VoWiFi service includes a VoWiFi roaming service or a VoWiFi non-roaming service; Whether the second domestic address database includes location information, if it is judged that the preset second domestic address database includes location information, execute step 208; if it is judged that the preset second domestic address database does not include VLR information, execute step 209. In this case, the user subscribes to a VoWiFi service (VoWiFi roaming service or VoWiFi non-roaming service), and the terminal is in a non-roaming state. In this embodiment, the second domestic address database includes location information corresponding to domestic regions.

In this embodiment, the location information includes GPS location information, and the GPS location information is longitude and latitude information. Therefore, when the CSCF determines that the terminal's access state is in a non-cellular network mode, the user needs to enable GPS positioning.

Step 208 , the CSCF allows the VoWiFi service registration of the terminal, and proceeds to step 210 .

Step 209 , the CSCF rejects the VoWiFi service registration of the terminal, and continues to execute step 213 .

Step 210, the CSCF sends a registration permission message to the terminal.

In this step, the allow registration message is a 200 OK response message.

Step 211, the CSCF sends a third-party registration request to the MMTel AS.

In step 212, the MMTel AS sends a registration success message to the CSCF, and the process ends.

In this embodiment, if the registration is successful, a registration success message is sent to the CSCF. In this step, the registration success message is a 200 OK response message.

Step 213, the CSCF sends a registration rejection message to the terminal, and the process ends.

In this step, the registration rejection message is a 403 response message.

Step 214, the CSCF allows the VoLTE service registration of the terminal.

Step 215, the CSCF sends a registration permission message to the terminal.

In this step, the allow registration message is a 200 OK response message.

Further, after the CSCF allows the VoWiFi service registration of the terminal (that is, the VoWiFi service registration is successful), the process of VoWiFi outgoing call and VoWiFi incoming call can also be performed.

Fig. 4 is a flow chart of the VoWiFi calling method in the embodiment of the present invention. As shown in Fig. 4, the method includes: Steps 1-3, the terminal (UE) sends an INVITE request to the SBC/CSCF, and sends it to the called party via the AS ;Step 4-6, the called party rings, sends a 180 ringing (ringing) response, and arrives at the UE via AS, SBC/CSCF; step 7-9, the called party picks up, sends a 200 OK response, and sends a /CSCF arrives at the UE, and the UE establishes an audio and video media stream call with the called party; Step 10-12, the called party hangs up, sends a BYE request, and sends it to the UE via MMTel AS, CSCF/SBC; Step 13-15, UE hangs up, Send a 200OK response and send it to the called party via CSCF/SBC and MMTel AS. Wherein, the UE is the calling party terminal.

Fig. 5 is the flow chart of VoWiFi call-in method in the embodiment of the present invention, as shown in Fig. 5, this method comprises: step 1, MMTel AS receives the INVITE call request from outside, includes called Query TEL URI in the INVITE request; 2. The MMTel AS sends the INVITE request to the SBC/CSCF; Step 3. The SBC/CSCF queries the phone number mapping (E.164NumberURI Mapping, ENUM for short)/Domain Name System (DNS for short) equipment called QueryTEL URI Corresponding SIP URI (multimedia public identity IMPU); Step 4, ENUM/DNS equipment returns corresponding SIP URI to CSCF, and this SIP URI is the VoLTE IMPU corresponding to the telephone number; Step 5, CSCF/SBC judges the UE corresponding to IMPU Online, send INVITE request to UE; step 6-8, UE returns 180ringing response to SBC/CSCF, and returns to calling party via SBCCSCF, MMTel AS, etc.; step 9-11, UE answers, returns 200OK response to CSCF/SBC , and return to the calling party via SBC/CSCF, MMTel AS, etc., and the two parties establish an audio and video media stream connection; step 12-14, the calling party hangs up, sends a BYE request, and sends it to the UE via MMTel AS, SBC/CSCF; step 15-17. The UE hangs up, sends a 200 OK response, and returns it to the calling party via the SBC/CSCF, MMTel AS, etc. Wherein, the UE is the called party terminal.

FIG. 6 is a schematic structural diagram of an international roaming restriction system provided by Embodiment 3 of the present invention. As shown in FIG. 6 , the system includes: a terminal 1 and a CSCF 2 .

The terminal 1 is used to send a registration message to the CSCF, and the registration message includes a service type and a terminal access status. CSCF2 is used to determine whether the terminal access state is in the cellular network mode if it is determined that the service type is VoWiFi; if the CSCF determines that the terminal access state is in the cellular network mode, determine whether to Allowing the terminal to roam in a roaming location, allowing the registration of the VoWiFi service of the terminal if it is determined that the terminal is allowed to roam in a roaming location, and rejecting the VoWiFi service of the terminal if it is determined that the terminal is not allowed to roam in a roaming location Register; if the CSCF judges that the terminal access status is not in the cellular network mode, judge whether to allow the terminal to roam in the roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming location, allow the terminal VoWiFi service registration of 1, if it is determined that the terminal is not allowed to roam in a roaming area, the VoWiFi service registration of the terminal 1 is rejected.

Further, the registration message also includes an account number and a password. CSCF 2 is also used to verify whether the account number and password are correct; if the account number and password are verified to be correct, continue to execute the step of judging whether the service type is VoWiFi.

Further, the system also includes: MMTel AS 3. CSCF 2 is also used to send a registration permission message to terminal 1; send a third-party registration request to MMTel AS 3; and send a registration success message to CSCF 2.

Further, CSCF 2 is also configured to send a registration rejection message to Terminal 1 .

In the technical solution of the international roaming restriction method and system provided by the present invention, the CSCF judges whether the terminal access status is the cellular network mode; if the CSCF judges that the terminal access status is the cellular network mode, according to the obtained VLR information judging whether the terminal is allowed to roam in the roaming location, if it is judged that the terminal is allowed to roam in the roaming location, the VoWiFi service registration of the terminal is allowed, and if it is judged that the terminal is not allowed to roam in the roaming location, rejecting the registration of the terminal VoWiFi service registration; if the CSCF judges that the terminal’s access status is not in the cellular network mode, it judges whether to allow the terminal to roam in the roaming location according to the acquired location information, and if it determines that the terminal is allowed to roam in the roaming location. VoWiFi service registration of the terminal, if it is determined that the terminal is not allowed to roam in a roaming area, reject the VoWiFi service registration of the terminal. The present invention realizes the restriction on VoWiFi roaming service.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A method for limiting international roaming, comprising: The terminal sends a registration message to the CSCF, and the registration message includes the service type and the terminal access status; If the CSCF determines that the service type is VoWiFi, it determines whether the terminal access state is a cellular network mode; If the CSCF determines that the terminal's access status is the cellular network mode, it judges whether to allow the terminal to roam in the roaming area according to the acquired VLR information, and if it determines that the terminal is allowed to roam in the roaming area, the VoWiFi of the terminal is allowed Service registration, if it is determined that the terminal is not allowed to roam in a roaming area, rejecting the VoWiFi service registration of the terminal; If the CSCF judges that the terminal access state is not in the cellular network mode, judge whether to allow the terminal to roam in the roaming area according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming area, allow the VoWiFi of the terminal For service registration, if it is determined that the terminal is not allowed to roam in a roaming location, the VoWiFi service registration of the terminal is refused. 2. The international roaming restriction method according to claim 1, wherein the registration message further includes an account number and a password; Before the CSCF judges whether the service type is VoWiFi, it also includes: CSCF verifies whether the account number and password are correct; If the CSCF verifies that the account number and password are correct, continue to execute the step of judging whether the service type is VoWiFi. 3. The method for restricting international roaming according to claim 1, wherein if the CSCF determines that the terminal access state is in the cellular network mode, it judges whether the terminal is allowed to roam in the roaming location according to the obtained VLR information. Roaming, if it is determined that the terminal is allowed to roam in a roaming location, allowing the VoWiFi service registration of the terminal, if it is determined that the terminal is not allowed to roam in a roaming location, rejecting the VoWiFi service registration of the terminal includes: The CSCF inquires from the HSS that the service number of the terminal has subscribed to the VoWiFi roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges whether the preset first roaming address library includes VLR information, and if Allowing the VoWiFi service registration of the terminal when it is determined that the preset first roaming address library includes VLR information, and rejecting the VoWiFi service registration of the terminal if it is determined that the preset first roaming address library does not include VLR information; or, The CSCF inquires from the HSS that the service number of the terminal has signed a VoWiFi service. The VoWiFi service includes the VoWiFi roaming service or the VoWiFi non-roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges the preset Whether the first domestic address database includes VLR information, if it is judged that the preset first domestic address database includes VLR information, the VoWiFi service registration of the terminal is allowed, if it is judged that the preset first domestic address database does not include VLR information rejecting the VoWiFi service registration of the terminal; or, The CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF obtains the VLR information of the VLR connected to the terminal from the HSS through the roaming status server; the CSCF judges whether the preset first roaming address library includes VLR information, and if If it is determined that the preset first roaming address database includes VLR information, the VoWiFi service registration of the terminal is rejected, and if it is determined that the preset first roaming address database does not include VLR information, the VoWiFi service registration of the terminal is allowed. 4. The international roaming restriction method according to claim 1, wherein the service registration message further includes location information; If the CSCF judges that the terminal access state is not in the cellular network mode, judge whether to allow the terminal to roam in a roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in a roaming location, allow the terminal to VoWiFi service registration, if it is determined that the terminal is not allowed to roam in a roaming area, rejecting the VoWiFi service registration of the terminal includes: The CSCF inquires from the HSS to find out that the service number of the terminal has signed a VoWiFi roaming service; the CSCF judges whether the preset second roaming address database includes location information, and allows the terminal if it determines that the preset second roaming address database includes location information. VoWiFi service registration, rejecting the VoWiFi service registration of the terminal if it is determined that the preset second roaming address library does not include location information; or, The CSCF inquires from the HSS to find out that the service number of the terminal has not subscribed to the VoWiFi roaming service; the CSCF judges whether the preset second roaming address library includes location information, and rejects the terminal if it determines that the preset second roaming address library includes location information VoWiFi service registration, if it is determined that the preset second roaming address library does not include location information, the VoWiFi service registration of the terminal is allowed; or, The CSCF inquires from the HSS that the service number of the terminal has signed a VoWiFi service. The VoWiFi service includes the VoWiFi roaming service or the VoWiFi non-roaming service; the CSCF judges whether the preset second domestic address database includes location information. When the second domestic address database includes location information, the VoWiFi service registration of the terminal is allowed, and if it is judged that the preset second domestic address database does not include VLR information, the VoWiFi service registration of the terminal is rejected. 5. The international roaming restriction method according to claim 1, characterized in that, after allowing the VoWiFi service registration of the terminal, the method further includes: The CSCF sends a registration permission message to the terminal; CSCF sends a third-party registration request to MMTel AS; The MMTel AS sends a registration success message to the CSCF. 6. The method for restricting international roaming according to claim 1, characterized in that, after rejecting the VoWiFi service registration of the terminal, it further comprises: The CSCF sends a registration rejection message to the terminal. 7. A system for limiting international roaming, comprising: a terminal and a CSCF; The terminal is configured to send a registration message to the CSCF, where the registration message includes a service type and a terminal access status; The CSCF is configured to determine whether the terminal access state is in the cellular network mode if it is determined that the service type is VoWiFi; if the CSCF determines that the terminal access state is in the cellular network mode, determine based on the acquired VLR information Whether to allow the terminal to roam in a roaming location, if it is determined that the terminal is allowed to roam in a roaming location, the VoWiFi service registration of the terminal is allowed, and if it is judged that the terminal is not allowed to roam in a roaming location, reject the VoWiFi service of the terminal Service registration; if the CSCF judges that the terminal access status is not in the cellular network mode, judge whether to allow the terminal to roam in the roaming location according to the acquired location information, and if it judges that the terminal is allowed to roam in the roaming location, allow the For the VoWiFi service registration of the terminal, if it is determined that the terminal is not allowed to roam in a roaming area, the VoWiFi service registration of the terminal is rejected. 8. The international roaming restriction system according to claim 7, wherein the registration message further includes an account number and a password; The CSCF is also used to verify whether the account number and password are correct; if the account number and password are verified to be correct, continue to execute the step of judging whether the service type is VoWiFi. 9. The international roaming restriction system according to claim 7, further comprising: MMTel AS; The CSCF is also used to send a registration permission message to the terminal; send a third-party registration request to the MMTel AS; The MMTel AS is also used to send a registration success message to the CSCF. 10. The international roaming restriction system according to claim 7, wherein the CSCF is further configured to send a registration rejection message to the terminal.