CN101287292B - Method and terminal for discovering entrance of calling control system - Google Patents

Abstract

The embodiment of the present invention discloses a method for discovering the entry point of a call control system and a terminal. The method includes: the terminal receives the address of the entry point of the call control system assigned and issued by the AAA server for the terminal; according to the address of the call entry point , the terminal discovers the call entry of the call control system. The terminal can obtain the address of the entry point of the call control system without performing the DHCP process and interacting with the DHCP server, so that the terminal can obtain the address of the call entry point more flexibly so as to discover the call entry.

Description

Method and terminal for discovering access to a call control system

This application is a divisional application of China's earlier patent application "method and system for discovering the entrance of a call control system". The application number of the earlier patent application is CN 200710006604.7, and the application date is January 18, 2007.

technical field

The present invention relates to the technical field of call control systems, in particular to two methods and terminals for discovering the entrance of the call control system.

Background technique

IP Multimedia Subsystem (IMS) is a subsystem supporting IP multimedia services proposed by the Third Generation Partnership Project (3GPP) in Release 5. Its outstanding features are the use of the Initial Session Protocol (SIP) and its independence from access . The frame structure of IMS defined by 3GPP includes call control function entity (Call Server Control Function, CSCF), media gateway control function entity (Media Gateway Control Function, MGCF), IP multimedia subsystem media gateway (IMS-Media Gateway, IMS-MGW) ), multimedia resource function controller (MultimediaResource Function Controller, MRFC), multimedia resource function processor (MultimediaResource Function Processor, MRFP) and breakout gateway control function entity (BreakoutGateway Control Function, BGCF), etc. Among them, the CSCF is the core of the entire network and supports SIP to process SIP sessions; the P-CSCF is the entrance for the terminal to access the IMS system, and realizes the proxy (Proxy) and user agent (User Agent) functions in SIP. In an IMS system or other call control systems, the system entry can also be a SIP proxy. In the following, the call control system is an IMS system, and the entrance is a P-CSCF as an example for description.

Figure 1 shows the network architecture when the access network is WiMAX and the user is roaming, where the P-CSCF is the only entrance for the caller terminal to send all SIP messages. Therefore, before sending a SIP message, the terminal must know the address of the P-CSCF.

In the prior art, the terminal interacts with the DHCP server to obtain the address of the P-CSCF through the Dynamic Host Configuration Protocol (DHCP). The specific process is shown in Figure 2, including the following steps:

In step 201, the terminal sends a DHCP discovery (DHCPDiscover) message to the DHCP relay (DHCP Relay), and in step 202, the DHCP relay forwards the DHCP discovery message to the DHCP server, and then in steps 203 and 204, the DHCP server sends the P- The address of the CSCF is set in the DHCP response message and sent to the DHCP relay, and the DHCP relay sends the P-CSCF address in the received DHCP response message to the terminal through a DHCP offer (DHCP Offer) message.

In the WiMAX system, network access and mobility management of terminals are realized through Client Mobile IP (CMIP) and Proxy Mobile IP (PMIP). In the scenario where the terminal adopts PMIP, when the PMIP client performs the relay function, the registration of the mobile IP and the DHCP process are independent, so the terminal can obtain the P-CSCF address through the process of the above-mentioned prior art; and when the PMIP client performs the proxy function, the registration of the mobile IP is combined with the DHCP process, and does not involve the DHCP server, so the P-CSCF address cannot be obtained through the above-mentioned prior art. The DHCP process is not included in CMIP, so the P-CSCF address cannot be obtained through the above-mentioned prior art.

Contents of the invention

In view of this, the main purpose of the present invention is to provide two methods and terminals for discovering the entrance of the call control system, which can make the discovery of the entrance of the call control system more flexible.

In one aspect, the present invention provides a method for discovering an entry point of a call control system, the method comprising: the terminal receives the address of the entry point of the call control system assigned and issued by the AAA server for the terminal; according to the address of the entry point of the call Address, the terminal discovers the call entry of the call control system.

On the other hand, the present invention provides a method for discovering the entry point of the call control system, the method comprising: the terminal receives the address of the entry point of the call control system assigned and issued by the home agent for the terminal; according to the address of the call entry point, The terminal discovers the call entry of the call control system.

In another aspect, the present invention provides a terminal, which includes: an entry point address receiving device, configured to receive the entry point address of the call control system sent by the AAA server or the home agent.

It can be seen from the above solution that in the embodiment of the present invention, by assigning the entry point address of the call control system to the terminal, the terminal can obtain the entry point address of the call control system without performing the DHCP process and interacting with the DHCP server, and the terminal is more flexible. Get the address of the call entry point to discover the call entry.

Description of drawings

FIG. 1 is a schematic diagram of network composition in which the access network based on the IMS system is a WiMAX network;

Fig. 2 is the flow chart of terminal obtaining P-CSCF address in the prior art;

3 is a schematic diagram of the system composition of the first embodiment of the present invention;

FIG. 4 is a flow chart of the terminal acquiring the P-CSCF address in the first embodiment of the present invention;

5 is a schematic diagram of the system composition of the second embodiment of the present invention;

FIG. 6 is a flow chart of the terminal obtaining the P-CSCF address in the second embodiment of the present invention;

7 is a schematic diagram of the system composition of the third embodiment of the present invention;

FIG. 8 is a flow chart of the terminal obtaining the P-CSCF address in the third embodiment of the present invention;

9 is a schematic diagram of the system composition of the fourth embodiment of the present invention;

FIG. 10 is a flowchart of a terminal obtaining a P-CSCF address in the fourth embodiment of the present invention;

Fig. 11 is a schematic diagram of the system composition of the fifth embodiment of the present invention;

FIG. 12 is a flow chart of the terminal obtaining the P-CSCF address in the fifth embodiment of the present invention;

Fig. 13 is a schematic diagram of the system composition of the sixth embodiment of the present invention;

FIG. 14 is a flowchart of a terminal obtaining a P-CSCF address in the sixth embodiment of the present invention;

Fig. 15 is a schematic diagram of the system composition of the seventh embodiment of the present invention;

Fig. 16 is a flow chart of the terminal obtaining the P-CSCF address in the seventh embodiment of the present invention.

Fig. 17 is a schematic diagram of the system composition of the eighth embodiment of the present invention;

Fig. 18 is a flow chart of the terminal acquiring the P-CSCF address in the eighth embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

The main idea of the present invention is that the AAA server or HA assigns the entry point address of the call control system to the terminal, and distributes the address of the entry point of the call control system assigned to the terminal to the terminal.

In the present invention, the AAA server or HA can directly send the address of the entry point of the call control system configured in itself to the terminal, or can send the address of the entry point of the call control system configured in itself to other network elements, and then the other network elements It is issued to the terminal; or the terminal requests to initiate a request, and the AAA server, HA or other network elements deliver the address of the entry point of the call control system to the terminal. In this way, the terminal obtains the address of the entry point of the call control system, which makes the discovery of the entry point of the call control system more flexible, facilitates centralized control, and is suitable for networks that do not use the DHCP mechanism to obtain IP addresses.

The entry point of the above call control system may be a P-CSCF or a SIP proxy (SIPPROXY). The following takes the P-CSCF as an example as the entry point of the call control system for illustration.

The present invention can be applied in various application scenarios, and the present invention will be further described in detail below by being applied in several different scenarios of the WiMAX system as specific embodiments.

The present invention is applied in the scenario where the terminal adopts PMIP and the terminal obtains the P-CSCF address through the DHCP process, which is the first embodiment of the present invention. In this embodiment, during the Extensible Authentication Protocol (EAP) authentication process, the AAA server sends the address of the P-CSCF configured in itself to the authenticator (Authenticator), and then the PMIP client sends the address from the authenticator to the authenticator in the DHCP process. The P-CSCF address of the AAA server is delivered to the terminal.

The system on which this embodiment is based is shown in FIG. 3 , including a terminal, a DHCP entity, an authenticator, and an AAA server. The DHCP entity here may be a DHCP agent or a DHCP relay, hereinafter referred to as DHCP agent/relay. Among them, the terminal is used to initiate the EAP authentication process to the AAA server through the authenticator, and after the EAP authentication is completed, request the DHCP agent/relay to obtain the P-CSCF address through the DHCP process; the DHCP agent/relay is used to obtain the P-CSCF address according to the request of the terminal. Obtain the P-CSCF address from the authenticator and send it to the terminal; the authenticator is used to interact with the AAA server to authenticate the terminal, and obtain the P-CSCF address from the AAA server; the AAA server is used to authenticate the terminal, and according to its own The configured P-CSCF address information assigns a P-CSCF to the user, and delivers the assigned P-CSCF address to the authenticator.

In a roaming scenario, the system based on this embodiment includes a home AAA (H-AAA) server and a visited AAA (V-AAA) server. According to the agreement between operators, if the home network assigns the P-CSCF address, Then the H-AAA server assigns the P-CSCF to the user according to the P-CSCF address information configured in itself, and sends the assigned P-CSCF address to the authenticator through the V-AAA server; if the P-CSCF is assigned by the visited network address, the V-AAA server assigns a P-CSCF to the user according to the P-CSCF address information configured in itself, and sends the assigned P-CSCF address to the authenticator.

Taking the roaming scenario as an example, the process for the terminal to discover the P-CSCF address in this embodiment is shown in Figure 4, including the following steps:

Steps 401 to 402, during the EAP authentication process, the terminal sends an EAP authentication message to the authenticator, and the authenticator sends an EAP authentication request to the terminal's H-AAA server through the V-AAA server according to the EAP authentication message from the terminal.

Step 403, the H-AAA server authenticates the terminal, and sends authentication related parameters to the authenticator through the V-AAA server. Here, according to the agreement between operators, if the P-CSCF is allocated by the home network, the H-AAA server will allocate the P-CSCF to the user according to the P-CSCF address information configured in itself, and pass the allocated P-CSCF address through The V-AAA server sends it to the authenticator; if the P-CSCF address is assigned by the visited network, the V-AAA server assigns the P-CSCF to the user according to the P-CSCF address information configured in itself, and forwards authentication related parameters , and deliver the P-CSCF address assigned to the user by the V-AAA server to the authenticator together.

Step 404, after the EAP authentication succeeds, the authenticator sends an EAP authentication success message to the terminal.

Step 405 , during the DHCP process, the terminal sets a P-CSCF address request indication in the request message sent to the DHCP agent/relay, and requests to obtain the P-CSCF address information. The request message here may be a DHCP discovery message in the DHCP discovery process, or a DHCP request message in the DHCP request process.

Step 406: After receiving the request message including the P-CSCF address request indication, the DHCP agent/relay sends the P-CSCF address acquired by the authenticator to the terminal through a corresponding response message. Here, if the request message in the step 405 is a DHCP discovery message, then the response message here is a message provided by DHCP; if the request message in the step 405 is a DHCP request (Request) message, then the response message here is a DHCP response (Ack) information.

In this embodiment, the request message sent by the terminal to the DHCP agent/relay during the DHCP process may not carry the P-CSCF address request indication, and the DHCP agent/relay directly sends the authenticator to the DHCP offer message or the DHCP response message. The acquired P-CSCF address is actively delivered to the terminal.

In this embodiment, the content included in the EAP message bearing the P-CSCF address between H-AAA, V-AAA and the access network is shown in Table 1. It can be seen from Table 1 that the The EAP message adds the last two items on the basis of the existing EAP message: P-CSCF and DNS, where P-CSCF is the IP address list or domain name address list of the P-CSCF sent to the authenticator, and DNS is used in the P-CSCF When the address in the CSCF item is a domain name address, the IP address of the DNS is provided for analyzing the domain name address of the P-CSCF to obtain the IP address.

Attribute Description EAP-Message EAP message Message-Authenticator authentication domain WiMAX-Capability WiMAX Specific Capabilities MN-HA-KEY Encryption key of MN and HA MN-FA-KEY Encryption key of MN and FA FA-HA-KEY Encryption key of MN and FA MN-HA-IP HA address MN-HOA Home address of MS MSK master key DHCP DHCP server address P-CSCF P-CSCF IP address list or domain name address list DNS If the address of P-CSCF is a domain name address, then the IP address of DNS is required

Table 1

In the first embodiment above, the AAA server sends the P-CSCF address configured in itself to the authenticator through the EAP authentication process, and the terminal obtains the P-CSCF address through the DHCP process. In the second embodiment of the present invention, the AAA server still sends the P-CSCF address configured in itself to the authenticator through the EAP authentication process, but then sends the P-CSCF address to the terminal through a broadcast message.

FIG. 5 is a schematic diagram of the system composition based on this embodiment, wherein the addition of an access network gateway on the basis of the system shown in FIG. 3 does not include a DHCP agent/relay. The added access network gateway is used to construct a routing broadcast message according to the information in the authenticator, and add the P-CSCF address information obtained by the authenticator from the AAA server to the routing broadcast message; The P-CSCF address information is obtained from the broadcast message sent by the access network gateway; the interaction between the authenticator and other entities is the same as that in the first embodiment. The access network gateway here may be a foreign agent in IPv4 or an access router in IPv6, and the corresponding route broadcast message is a foreign agent broadcast message or a route notification message.

In this embodiment, the extended option information element as in table 2 is added in the routing broadcast message, wherein the option type (Option type) field can take up 8-bit space; the option length (Option length) field can take up 8-bit space for Indicates the length of the P-CSCF address field; the P-CSCF address (P-CSCF Address) field can occupy 128 bytes of space.

Option type Option length P-CSCF Address

Table 2

The flow of this embodiment is shown in Figure 6, where steps 601 to 604 included in the EAP authentication process are the same as steps 401 to 404 in Figure 4, and in step 605, the access network gateway constructs the P-CSCF address Routing the broadcast message and broadcasting the message, the terminal can obtain the P-CSCF address after receiving the broadcast message.

The present invention is applied to the scenario where the terminal adopts CMIP, and the AAA server assigns and delivers the P-CSCF address to the terminal, which is the third embodiment of the present invention. In this embodiment, the AAA server sends the P-CSCF address configured in itself to the terminal through the home agent in the mobile IP request process.

The system based on this embodiment is shown in FIG. 7 , including a terminal, a home agent, and an AAA server. Among them, the terminal is used to send the mobile IP registration request carrying the P-CSCF address request indication to the home agent, and receive the mobile IP registration response message carrying the P-CSCF address from the home agent to obtain the P-CSCF address; the home agent is used to receive MIP registration request from the terminal, and initiate a request for user authentication to the AAA server, and send the P-CSCF address issued by the AAA server through the authentication response to the terminal through the MIP registration response message; the AAA server is used to receive from the home agent. The request for user authentication authenticates the user, and sends the P-CSCF address configured in itself to the home agent through an authentication response.

In the roaming scenario, the system of this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward request and response messages between the terminal and the home agent.

Taking the roaming scenario as an example, the process for the terminal to discover the P-CSCF address in this embodiment is shown in Figure 8, including the following steps:

Step 801, the foreign agent advertises to the terminal through a MIP advertisement (Adv) message, so that the terminal obtains the address (CoA) of the foreign agent.

Step 802, the terminal sends a MIP registration request to the foreign agent, and the request carries network identifier NAI, home agent address (HoA), CoA and P-CSCF address request instruction information.

Step 803, the foreign agent initiates a MIP registration request to the home agent, and the message carries the network identifier NAI, HoA, CoA and P-CSCF address request indication information carried in the MIP registration request message in step 802.

Step 804: After receiving the MIP registration request, the home agent sends an AAA authentication request to the AAA server, requesting the AAA server to authenticate the user and obtain relevant information. The request may include a P-CSCF address request indication.

Step 805: After receiving the MIP registration request from the home agent, the AAA server returns an AAA authentication response message to the home agent, and the message includes the P-CSCF address configured in the AAA server itself.

Step 806: The home agent responds to the Mobile IP registration message initiated by the foreign agent, and includes the allocated P-CSCF address in the MIP registration response message.

Step 807, the foreign agent returns a MIP response message to the MIP registration request initiated by the terminal, and the message includes the P-CSCF address allocated by the AAA server.

In this embodiment, in the MIP registration request message mentioned in step 802 and step 803, an information element (IE) may be added respectively as a P-CSCF address request indication, indicating that the terminal requires to obtain a P-CSCF address. The added cell format can be shown in Table 3, wherein the type (Type) value indicates the P-CSCF address request, the data (data) field is empty, and the length (length) field is used to indicate the space occupied by the data field. Then in the MIP registration response message mentioned in step 806 to step 807, correspondingly increase the information element to carry the P-CSCF address message, the added information element has the same structure as Table 3, where the Type value and the corresponding request message The Type value is the same, and the data field is the IP address list of the assigned P-CSCF, or the domain name list (domain name list) and the IP address of the DNS.

type lengih data

table 3

In this embodiment, the extension of the AAA request message and the AAA response message may be the same as that in the first embodiment, adding P-CSCF attributes on the basis of existing EAP messages, or further adding DNS attributes.

The present invention is applied to the scenario where the terminal adopts CMIP, and the HA allocates and issues the P-CSCF address for the terminal, which is the fourth embodiment of the present invention. In this embodiment, the HA of the terminal sends the P-CSCF address configured in itself to the terminal during the mobile IP request process.

The system based on this embodiment is shown in FIG. 9 , including a terminal and a home agent. Among them, the terminal is used to send the mobile IP registration request carrying the P-CSCF address request indication to the home agent, and receive the mobile IP registration response message carrying the P-CSCF address from the home agent to obtain the P-CSCF address; the home agent is used to receive The MIP registration request from the terminal is based on the P-CSCF address configured in itself, and the P-CSCF address allocated for the terminal is sent to the terminal through the MIP registration response message.

In the roaming scenario, the system of this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward request and response messages between the terminal and the home agent.

Taking the roaming scenario as an example, the process for the terminal to discover the P-CSCF address in this embodiment is shown in Figure 10, wherein, steps 1001 to 1003 are the same as steps 801 to 803 in Figure 8, and in step 1004, the home After receiving the MIP registration request, the agent allocates a P-CSCF address for the terminal according to the P-CSCF address configured in itself, and sends the P-CSCF address allocated for the terminal to the foreign agent through the MIP registration response message. In step 1005, the foreign agent The agent returns a MIP response message to the MIP registration request initiated by the terminal, and the message includes the P-CSCF address allocated by the HA to the terminal.

In this embodiment, the format of the MIP registration request message and the MIP response message may be the same as that in the third embodiment.

The present invention is applied in the scenario where the terminal adopts PMIP and the terminal obtains the P-CSCF address assigned by the AAA server through the DHCP process and the mobile IP registration process combined in the same process, which is the fifth embodiment of the present invention. In this embodiment, through the mobile IP request process combined with the DHCP process, the AAA server sends the P-CSCF address configured in itself to the terminal through the home agent.

The system based on this embodiment is shown in FIG. 11 , including a terminal, a DHCP agent, a PMIP client, a home agent, and an AAA server. Among them, the terminal is used to send a DHCP discovery request carrying P-CSCF address request indication information to the DHCP agent, and receive a DHCP offer message carrying P-CSCF address information returned by the DHCP agent; the DHCP agent is used to trigger the DHCP discovery request according to the terminal. The PMIP client sends a mobile IP registration request carrying the P-CSCF address request indication to the home agent, and sends the P-CSCF address provided by the PMIP client to the terminal through a DHCP offer message; the PMIP client is used to send the P-CSCF address to the home agent. -CSCF address request indicates the mobile IP registration request of the information, and receives the mobile IP registration response message carrying the P-CSCF address from the home agent, and provides the P-CSCF address to the DHCP agent; the home agent is used to receive from the PMIP The client MIP registration request, and initiates a request for user authentication to the AAA server, and sends the P-CSCF address issued by the AAA server through the authentication response to the PMIP client through the MIP response; the AAA server is used to receive the pair from the home agent The user authentication request authenticates the user, and sends the P-CSCF address configured in itself to the home agent through an authentication response.

In a roaming scenario, the system of this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward request and response messages between the PMIP client and the home agent.

Taking the roaming scenario as an example, the process for the terminal to discover the P-CSCF address in this embodiment is shown in Figure 12, including the following steps:

Step 1201, the terminal sends a DHCP discovery message with requesting P-CSCF indication information to the DHCP agent.

Step 1202 , the DHCP agent triggers the PMIP client to perform mobile IP registration, and sends a mobile IP registration request to the foreign agent, and the request includes P-CSCF address request indication information.

Step 1203, the foreign agent initiates a mobile IP registration request to the home agent, which includes P-CSCF address request indication information.

Step 1204, the home agent requests the AAA server to authenticate the user and obtain relevant information, and the authentication request may include P-CSCF address request indication information.

Step 1205: After receiving the authentication request from the home agent, the AAA server authenticates the user, and returns an authentication response message to the home agent, which includes the P-CSCF address assigned to the user.

Step 1206, the home agent responds to the mobile IP registration message initiated by the foreign agent, and the MIP registration response message sent to the foreign agent contains the P-CSCF address assigned by the AAA server

Step 1207, the foreign agent responds to the MIP registration request initiated by the PMIP client, and includes the P-CSCF address distributed by the AAA server in the MIP registration response message sent to the PMIP client

Step 1208, the PMIP client triggers the DHCP agent to send a DHCP offer message to the terminal, which includes the P-CSCF address allocated by the AAA server for the terminal.

In this embodiment, the DHCP discovery message and the DHCP offer message may not include DHCP-related information, and the PMIP client may carry the P-CSCF address request indication information in the MIP registration request by itself, thereby obtaining the P-CSCF assigned by the AAA server to the terminal. CSCF address. Then the terminal can carry the P-CSCF address request indication through the DHCP request message, and the DHCP agent sends the P-CSCF address assigned to the terminal by the AAA server to the terminal through the DHCP response message.

In addition, each of the above request messages may not include the P-CSCF address request indication information. After the AAA server authenticates the user, it will actively pass the home agent and other network addresses in the system to the P-CSCF address assigned to the user. Yuan is sent to the terminal.

The present invention is applied in the scenario where the terminal adopts PMIP and the terminal obtains the HA to assign a P-CSCF address to it through the DHCP process and the mobile IP registration process combined in the same process, which is the sixth embodiment of the present invention. In this embodiment, through the mobile IP request process combined with the DHCP process, the HA sends the P-CSCF address configured in itself to the terminal through the home agent.

The system based on this embodiment is shown in FIG. 13 , including a terminal, a DHCP agent, a PMIP client and a home agent. Among them, the terminal is used to send a DHCP discovery request carrying P-CSCF address request indication information to the DHCP agent, and receive a DHCP offer message carrying P-CSCF address information returned by the DHCP agent; the DHCP agent is used to trigger the DHCP discovery request according to the terminal. The PMIP client sends a mobile IP registration request carrying the P-CSCF address request indication to the home agent, and sends the P-CSCF address provided by the PMIP client to the terminal through a DHCP offer message; the PMIP client is used to send the P-CSCF address to the home agent. -CSCF address request indicates the mobile IP registration request of the information, and receives the mobile IP registration response message carrying the P-CSCF address from the home agent, and provides the P-CSCF address to the DHCP agent; the home agent is used to receive from the PMIP The client sends a MIP registration request, and allocates a P-CSCF address for the terminal according to the P-CSCF address configured in itself, and sends the P-CSCF address allocated for the terminal to the PMIP client through the MIP response.

In a roaming scenario, the system of this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward request and response messages between the PMIP client and the home agent.

Taking the roaming scenario as an example, the process for the terminal to discover the P-CSCF address in this embodiment is shown in Figure 14, where steps 1401 to 1403 are the same as steps 1201 to 1203 in Figure 12, and in step 1404, the home The agent allocates the P-CSCF address to the terminal according to the P-CSCF address configured in itself, and sends the P-CSCF address allocated to the terminal to the foreign agent through the MIP registration response message. In step 1405, the foreign agent responds to the MIP registration request initiated by the PMIP client, and sends a MIP registration response message to the PMIP client, which contains the P-CSCF address that the HA distributes for the terminal. After this, in step 1406, the PMIP The client triggers the DHCP agent to send a DHCP offer message to the terminal, which includes the P-CSCF address allocated by the HA to the terminal.

In this embodiment, the DHCP discovery message and the DHCP offer message may not include DHCP-related information, and the PMIP client may carry the P-CSCF address request indication information in the MIP registration request by itself, thereby obtaining the P-CSCF allocated by the HA to the terminal. address. Then the terminal can carry the P-CSCF address request indication through the DHCP request message, and the DHCP agent sends the P-CSCF address allocated by the HA to the user to the terminal through the DHCP response message.

In addition, each of the above request messages may not include the P-CSCF address request indication information, and then the HA actively sends the P-CSCF address allocated to the terminal to the terminal through other network elements such as a foreign agent in the MIP registration response message.

In the present invention, the AAA server can also assign the P-CSCF address to the user during the initial authentication process, and send the assigned address to the terminal through the access router in the access network gateway. The method for enabling the terminal to obtain the P-CSCF address will be described in detail below through the seventh embodiment.

As shown in FIG. 15 , it is a system composition diagram based on the seventh embodiment of the present invention, including: a terminal (MN), an access network gateway and an H-AAA server. Wherein, the terminal is used to interact with the access network gateway for initial access authentication, and after completing the initial access authentication, send an information acquisition request to the access network gateway, and receive the information returned by the access network gateway including P-CSCF address information The access information response to obtain the P-CSCF address; the access network gateway is used to interact with the terminal for initial access authentication, send an access request to the H-AAA, and receive the access message carrying the P-CSCF address returned by the H-AAA server Accept the message, store the information such as the P-CSCF address in the access acceptance message, and send the information including the P-CSCF address to the terminal through the information acquisition response message according to the information acquisition request of the terminal; the H-AAA server is used to receive According to the access request from the access network gateway, the user is allocated relevant information including the P-CSCF address, and the allocated information is sent to the access network gateway through an access acceptance message. The above-mentioned access network gateway includes an access router, wherein the information acquisition request and information acquisition response messages exchanged between the access network gateway and the terminal are specifically interacted by the access router and the terminal.

In this embodiment, the process for the terminal to discover the P-CSCF address is shown in Figure 16, including the following steps:

Step 1601, the terminal interacts with the access network gateway to perform initial access authentication (BeginAccess-Auth).

Step 1602, the access network gateway sends an access request (Access Request) to the H-AAA, requesting for allocation of related information.

Step 1603, the H-AAA access request allocates corresponding HA, HL and other information, and allocates P-CSCF address information for the terminal.

Step 1604, the H-AAA sends information such as HA, HL and P-CSCF addresses allocated to the user to the access network gateway through an Access Accept message.

Step 1605, the access network gateway stores the received information such as addresses of HA, HL and P-CSCF.

Step 1606, the access network gateway interacts with the terminal to complete the initial access authentication.

Step 1607, the terminal sends an information request (Information Request) to the access router on the access network gateway, requesting to obtain relevant information.

Step 1608, the access router sends the P-CSCF address information and other relevant information stored in the access network gateway to the terminal through an information reply (Information Reply) message.

In the present invention, the AAA server can also assign the P-CSCF address to the user in the initial authentication process, and pass the assigned address through the external agent in the access network gateway in the mobile IP registration process initiated by the mobile terminal. After the returned mobile IP is registered and corresponding and before being sent to the mobile terminal, the corresponding obtained or pre-configured P-CSCF address of the terminal is sent to the mobile terminal. The method of enabling the terminal to obtain the P-CSCF address will be described in detail below through the eighth embodiment.

As shown in FIG. 17 , it is a system composition diagram based on the eighth embodiment of the present invention, including: a terminal (MN), an access network gateway and an H-AAA server. Wherein, the terminal is used to interact with the access network gateway for initial access authentication, and after completing the initial access authentication, send an information acquisition request to the access network gateway, and receive the information returned by the access network gateway including P-CSCF address information The access information response to obtain the P-CSCF address; the access network gateway is used to interact with the terminal for initial access authentication, send an access request to the H-AAA, and receive the access message carrying the P-CSCF address returned by the H-AAA server Accept the message, store the information such as the P-CSCF address in the access acceptance message, and send the information including the P-CSCF address to the terminal through the information acquisition response message according to the information acquisition request of the terminal; the H-AAA server is used to receive According to the access request from the access network gateway, the user is allocated relevant information including the P-CSCF address, and the allocated information is sent to the access network gateway through an access acceptance message. The above-mentioned access network gateway includes an access router, wherein the information acquisition request and information acquisition response messages exchanged between the access network gateway and the terminal are specifically interacted by the access router and the terminal.

In this embodiment, the process for the terminal to discover the P-CSCF address is shown in Figure 18, including the following steps:

Step 1801, after the foreign agent obtains its P-CSCF address through pre-configuration or through its initial authentication process during the mobile terminal network access process through AAA, the foreign agent advertises to the terminal through a MIP advertisement (Adv) message, so that the terminal obtains the address of the foreign agent (CoAs).

Step 1802, the terminal sends a MIP registration request to the foreign agent, and the request carries the network identifier NAI, home agent address (HoA), and CoA.

Step 1803, the foreign agent initiates a MIP registration request to the home agent, and the message carries the network identifiers NAI, HoA, and CoA carried in the MIP registration request message in step 802.

Step 1804: After receiving the MIP registration request, the home agent sends an AAA authentication request to the AAA server, requesting the AAA server to authenticate the user and obtain relevant information.

Step 1805: After receiving the MIP registration request from the home agent, the AAA server returns an AAA authentication response message to the home agent.

Step 1806, the home agent responds to the mobile IP registration message initiated by the foreign agent.

Step 1807, the foreign agent returns a MIP response message to the MIP registration request initiated by the terminal, and the message includes the P-CSCF address allocated by the AAA server.

In this embodiment, in the MIP registration request message mentioned in step 802 and step 803, an information element (IE) may be added respectively as a P-CSCF address request indication, indicating that the terminal requires to obtain a P-CSCF address. The added cell format can be shown in Table 3, wherein the type (Type) value indicates the P-CSCF address request, the data (data) field is empty, and the length (length) field is used to indicate the space occupied by the data field. Then in the MIP registration response message mentioned in step 806 to step 807, correspondingly increase the information element to carry the P-CSCF address message, the added information element has the same structure as Table 3, where the Type value and the corresponding request message The Type value is the same, and the data field is the IP address list of the assigned P-CSCF, or the domain name list (domain name list) and the IP address of the DNS.

In this embodiment, the extension of the AAA request message and the AAA response message may be the same as that in the first embodiment, adding P-CSCF attributes on the basis of existing EAP messages, or further adding DNS attributes.

The above is the description of the specific embodiments of the present invention, and the method of the present invention can be appropriately improved during the specific implementation process to meet the specific needs of specific situations. Therefore, it can be understood that the specific implementation manners according to the present invention are only exemplary, and are not intended to limit the protection scope of the present invention.

Claims (6)

1. a method of finding entrance of calling control system is characterized in that, this method comprises:

It is said terminal distribution and the entrance of calling control system dot address that issues that the terminal receives the authentication and authorization charging aaa server;

According to the address of said entrance of calling control system point, call control system calling inlet is found at the terminal;

Wherein, it is said terminal distribution and the entrance of calling control system dot address that issues that said terminal receives the authentication and authorization charging aaa server, comprising:

In Extensible Authentication Protocol EAP verification process; Said terminal receives the said entrance of calling control system dot address that the dynamic host configuration protocol DHCP entity issues; Wherein, Said entrance of calling control system dot address is said terminal distribution by said authentication and authorization charging aaa server, and is handed down to the authenticator by said authentication and authorization charging aaa server, and is obtained from said authenticator by the said DHCP entity that is in the same physical entity with said authenticator.

2. method according to claim 1 is characterized in that, said control system entry point address is pre-configured by aaa server, and is terminal distribution according to the entrance of calling control system dot address that disposes in the aaa server.

3. method according to claim 1 is characterized in that, the said DHCP entity of said terminal request is handed down to said terminal with said entrance of calling control system dot address from aaa server.

4. method according to claim 3 is characterized in that, said terminal is through dhcp discover message, or the DHCP request message is to authenticator's acquisition request entrance of calling control system dot address.

5. according to arbitrary described method in the claim 1 to 4, it is characterized in that said call control system is an IP Multimedia System; Said entrance of calling control system point is: proxy-call session control function entity P-CSCF or initial session protocol sip agent.

6. according to arbitrary described method in the claim 1 to 4, it is characterized in that described entrance of calling control system dot address is: call out the IP address list of entrance, perhaps be: call out the domain name tabulation of entrance and the IP address of address analyzing server DNS.

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