CN1882172A - User registration and conversation switching method in IP multimedia terminal and system - Google Patents

Abstract

The invention relates to a method for registering user in IP multimedia subsystem, for solving the present technique which can only register with the SIP URI mark as base mark. The inventive method comprises: user uses E.164 mark as basic mark to initialize register request; IMS terminal transforms said E.164 mark into the register mark meeting SIP protocol, and adds the register mark into the register request message; the network device of IMS network, based on said register request message, completes the priority identification and register.

Description

Method for user registration and session connection in IP multimedia terminal and system

technical field

The invention relates to a 3G wireless network, in particular to an IP multimedia terminal and a method for user registration and session connection in the system.

Background technique

The IP Multimedia Subsystem (IMS) is a subsystem superimposed on the packet network by the 3rd Generation Partnership Project (3GPP). The IMS uses the packet domain as the bearer channel for its control signaling and media transmission, and introduces the Session Initiation Protocol (SIP) as a service control protocol. Provide rich multimedia services by separating service control from bearer control.

In IMS applications, in order to complete the registration function of the user (UE) and the calling and called services, 3GPP defines two public identities:

1. Public User Identity (IMPU): Users use the IMPU to communicate. Each IMS user has one or more IMPUs. The IMPU has a Session Initiation Protocol Universal Resource Identifier (SIP URI) format or an E.164 format, these two forms of expression. For example: SIP URI is sip:tom@example.com; E.164 is 13912345678. The IMPU is initially stored in the UE IMS Subscriber Identity Module (ISIM) and HSS.

2. Public Service Identifier (PSI): The PSI is used to correspond to a specific service in an application server. The public service identifier adopts SIP URI or E.164 format, for example: sip:conference@examplenetwork.com.

3GPP specifies that SIP URI is the basic identifier of IMS, that is, IMS users or services must have a SIPURI identifier. Accordingly, the IMS adopts the strategy of DNS resolution of SIP URI and obtaining network addresses for routing.

With the development of IMS and the demand for mobile and fixed convergence, IMS has become the best solution for mobile and fixed convergence. At present, in order to enable the IMS to communicate with the Public Telephone Service Network/Public Land Mobile Network (PSTN/PLMN), 3GPP introduces the E.164 identifier through implicit registration. However, in 3GPP, the basic identifier is the mandatory identifier, so the user must have the SIP URI identifier, but may not have the E.164 identifier.

Based on the above provisions, the current IMS user registration process is shown in Figure 1, and the steps are as follows:

-The user uses the SIP URI identifier in the IMPU to initiate a registration request, and sends the registration request to the P-CSCF;

-P-CSCF performs DNS protocol analysis on the home network address in the registration request, obtains the I-CSCF address in the user's home network, and forwards the registration request to the I-CSCF;

- The I-CSCF queries the HSS for the registration status of the user, obtains the address of the S-CSCF that provides services for the user according to the information returned by the HSS, and sends the registration message to the S-CSCF;

-S-CSCF queries the HSS and obtains the user's authentication information, and then initiates an authentication challenge (401 Challenge) to the user;

- The user calculates the authentication response and re-initiates the registration process. If the S-CSCF passes the authentication, a success confirmation is returned and the registration process is completed.

At present, the session connection of the IMS user is divided into the connection in the home network of the calling user, whose flow is shown in Figure 2, and the connection in the home network of the called user, whose flow is shown in Figure 3, as can be seen from the above two figures, The next steps are as follows:

-The user uses the SIP URI identifier in the IMPU to initiate an implicit session request, and sends the session request to the P-CSCF;

- The P-CSCF forwards the session request to the S-CSCF according to the path saved during user registration;

- Due to the implicit session mode, the S-CSCF performs ENUM analysis on the called E.164 identity.

If the parsing fails, the called party is considered to be a PSTN/PMN user, and the session request is forwarded to the BGCF. BGCF queries internal or external routing data, obtains MGCF address, and forwards the request to MGCF. The MGCF forwards the session request to the PSTN/PMN to which the called user belongs.

If the resolution is successful, it is considered that the called party is an IMS user. According to the address resolved by ENUM, the called SIP URI is obtained, and then DNS resolution is performed on the SIP URI to obtain the I-CSCF address to which the called user belongs. After that, the session is forwarded request to the I-CSCF.

- The I-CSCF queries the HSS for the location information of the called user, and obtains the address of the S-CSCF that provides services for the called user. After that, forward the session request to the S-CSCF. The connection is done by the S-CSCF.

At present, traditional fixed terminals use the E.164 numbering method, that is, numbers are used as the numbering method of telephone numbers. However, in the IMS standard of 3GPP, the SIP URI identification is used as the basic identification of users or services. Although the E.164 identification scheme (implicit mode) is provided, the E.164 identification is an optional identification, which is mainly applied to the interworking between IMS and PSTN/PLMN. In the IMS standard, when the IMS network supports fixed network user connection with SIP URI as the basic identifier, there may be number conversion and intercommunication problems, and it is more complicated to implement in order to meet traditional user terminals and user habits.

Contents of the invention

The present invention provides a method for IMS user registration, which is used to solve the problem that the prior art only provides a method of initiating registration with the SIPURI logo as the basic logo, the user has no choice, and the implementation is relatively complicated in order to meet the requirements of traditional user terminals and user habits. .

The present invention also provides a method for IMS session connection, which is used to solve the possible problem of number conversion and intercommunication in the prior art, and the need for ENUM analysis and DNS analysis in the connection process, which makes the connection more complicated.

In order to support the method, the present invention provides an IMS terminal.

The registration method of the present invention includes steps:

A. The user initiates a registration request with the E.164 identifier as the basic identifier;

B. The IMS terminal converts the E.164 identifier into a registration identifier conforming to the SIP protocol, and adds the registration identifier to the registration request message;

C. A network device in the IMS network completes authentication and registration according to the registration request message.

Described step C comprises the following steps:

C1. The proxy call session control function (P-CSCF) obtains the address of the inquiry call session control function entity (I-CSCF) in the home network of the IMS terminal, and sends the registration request message to the I-CSCF;

C2. The I-CSCF obtains the address of the serving call session control function entity (S-CSCF) to which the IMS terminal belongs, and sends the registration request message to the S-CSCF;

C3. The S-CSCF obtains the authentication information corresponding to the user, and completes authentication and registration.

The registration identifier is a Session Initiation Protocol Universal Resource Identifier (SIP URI).

Said converting the E.164 identifier into a SIP URI is to add a domain name for identifying E.164 after the E.164 identifier.

In the step C1, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs Domain Name Resolution Protocol (DNS) on the address to obtain the I-CSCF address in the home network of the IMS terminal . In the step C2, the I-CSCF restores the E.164, and converts the E.164 into a TEL URI format, so as to obtain the address of the S-CSCF to which the IMS terminal belongs from the home subscriber server (HSS) . In the step C3, the S-CSCF restores the E.164, and converts the E.164 into a TEL URI format, so as to obtain the user's authentication information from the HSS.

Establish the corresponding relationship between the address information and authentication information set in the Home Subscriber Server (HSS) and the SIP URI after the E.164 conversion, then in the step C2, the I-CSCF directly inquires with the registration identifier The address of the S-CSCF to which the IMS terminal belongs. In the step C3, the S-CSCF directly queries the user's authentication information in the HSS with the registration ID.

The registration identifier is TEL URI.

In the step C1, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs DNS protocol analysis on the address to obtain the I-CSCF address in the home network of the IMS terminal. In the step C2, the I-CSCF obtains the address of the S-CSCF to which the IMS terminal belongs directly from the HSS by using the registration identifier. In the step C3, the S-CSCF directly acquires the user's authentication information from the HSS with the registration ID.

The method for session continuation of the present invention comprises the following steps:

The IMS calling terminal initiates a session request with the called E.164 identifier; in the home network of the calling terminal, convert the E.164 identifier into a universal resource format identifier (URI), and use the URI to obtain the called terminal A next-hop address in the home network; sending the session request to the next-hop address, and completing the connection in the home network of the called terminal.

The described E.164 identification is converted into URI, and obtains the next hop address in the home network of the called terminal with this URI is the E.164 identification translation agreement (ENUM) server that is provided with the SIP URI after the E.164 conversion Query the SIP URI corresponding to the called party; perform DNS resolution on the SIP URI to obtain the next-hop address.

The E.164 identification is converted into a URI, and the URI is used to obtain the next hop address in the home network of the called terminal. The S-CSCF that the calling terminal belongs to converts the called E.164 identification into a TEL URI, and Use the TEL URI to query the corresponding next-hop address in the database. The database is an internal routing database or an external routing database.

If the obtained next-hop address is the I-CSCF address, the connection in the home network of the called terminal is completed, including the following steps:

- the I-CSCF queries the HSS for the location information of the called terminal;

- carrying the S-CSCF address to which the called terminal belongs in the message responded by the HSS;

- The I-CSCF forwards the session request to the S-CSCF, and the S-CSCF completes the connection.

If the obtained next-hop address is the address of the border gateway control function entity (BGCF), the connection in the home network of the called terminal is completed, including the following steps:

- the BGCF forwards the session request to the Media Gateway Control Function (MGCF);

- The MGCF sends the session request to the Public Telephone Service Network (PSTN) or Public Land Mobile Network (PLMN), and completes the connection.

An IMS terminal of the present invention includes: a terminal body;

A conversion module, which is set inside the terminal body, is used to convert the E.164 identification into a registered identification conforming to the SIP protocol.

The beneficial effects of the present invention are as follows:

The present invention uses the E.164 identifier as the basic identifier of the IP multimedia subsystem. According to the stipulations of the 3GPP protocol, when a user registers, the registration process is initiated with a basic ID. The present invention initiates registration by converting E.164 into a registration identifier in TELURI format or SIP URI format, and adding the registration identifier to a registration request message. And in the place where E.164 needs to be restored in the registration process, the registration identifier is reversely converted to realize authentication and complete registration. In this way, users can initiate registration not only with the SIP in the prior art, but also with E.164 as the basic identifier, which increases user selectivity and better supports traditional user terminals and user habits.

The present invention uses the E.164 identifier as the basic identifier of the IP multimedia subsystem. When the calling user initiates a call, query the address of the I-CSCF to which the called user belongs with the called E.164 identifier, or query the address of the BGCF to which the called user belongs with the E.164 identifier, and then according to The queried address connects the session to the corresponding network element entity, and then completes the connection in the called side network to realize the session connection. Through the implementation of the invention, ENUM parsing can be avoided in the connection process, and the connection process is simplified; the next hop address is obtained by querying, and number conversion is avoided in the connection process, thereby better solving the number conversion and intercommunication problems.

Description of drawings

FIG. 1 is a signaling flowchart of a registration method in the prior art;

FIG. 2 is a flow chart of session connection signaling in the calling party's home network in the prior art;

Fig. 3 is the flowchart of session connection signaling in the called home network in the prior art;

Fig. 4 is the signaling flowchart of the registration method of the present invention;

Fig. 5 is a flow chart of the steps of the registration method of the present invention;

FIG. 6 is a signaling flowchart of the session connection method of the present invention;

FIG. 7 is a flow chart of the steps of the conversation connection method of the present invention;

FIG. 8 is a flow chart of steps of another session connection method of the present invention.

Detailed ways

In order to make the E.164 mark the basic mark of the IP Multimedia Subsystem (IMS), and then increase user selectivity, and better support traditional user terminals and user habits, the present invention provides an IP multimedia terminal, including:

The terminal body is used to realize the inherent functions of the IMS terminal;

A conversion module, which is set inside the terminal body, is used to convert the E.164 identification into a registered identification conforming to the SIP protocol.

Based on the above IMS terminal, the present invention provides a user registration method in the IP multimedia subsystem. See Fig. 4, shown in Fig. 5, comprise the following steps:

S1. The user initiates a registration request using the E.164 identifier as a basic identifier.

S2. The IMS terminal converts the E.164 identifier into an identifier in SIP URI format, and adds the identifier in SIP URI format to the registration request message.

S3. The proxy call session control function (P-CSCF) entity obtains the address of the inquiry call session control function entity (I-CSCF) in the home network of the IMS terminal.

S4. Send the registration request message to the I-CSCF.

S5. The I-CSCF obtains the address of the Serving Call Session Control Function (S-CSCF) to which the IMS terminal belongs.

S6. Send the registration request message to the S-CSCF.

S7. The S-CSCF obtains the authentication information corresponding to the user, and completes authentication and registration.

The method for registering an IMS user is specifically described below with three examples.

Example 1: The database in the Home Subscriber Server (HSS) is not modified, and the E.164 identifier is converted into an identifier in the session initiation protocol universal resource (SIP URI) format to complete authentication and registration. The specific processing steps of this example are as follows:

S101. A user initiates a registration request using an E.164 identifier as a basic identifier.

Because existing agreement stipulates that SIP URI is the basic identification of IMS, and E.164 identification is subordinate identification, in order to implement the present invention, define described E.164 identification as basic identification.

In this way, the user can use the E.164 identifier as the basic identifier to initiate a registration request to the network side. S102. The IMS terminal converts the E.164 identifier into an identifier in SIP URI format, and adds the identifier in SIP URI format to the registration request message.

The IMS terminal uses the conversion module to add a domain name for identifying E.164 after the E.164 identification.

For example: E.164 number is +46-8-9761234. The converted SIP URI format is identified as sip:4689761234@e164.3gppnetwork.org. The domain name e164.3gppnetwork.org is used to indicate that this is an E.164 number.

Then fill in the SIP URI format identifier into the header field of the registration message to initiate a registration request. S103. The proxy call session control function (P-CSCF) entity obtains the address of the inquiry call session control function entity (I-CSCF) in the home network of the IMS terminal.

After receiving the registration request message, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs DNS resolution on the home network address to obtain the address in the home network of the IMS terminal. The address of the I-CSCF.

S104. Send a registration request message to the I-CSCF.

S105. The I-CSCF acquires the address of the Serving Call Session Control Function (S-CSCF) to which the IMS terminal belongs.

After the I-CSCF receives the registration request message, it obtains the identification of the SIP URI format, and restores the identification of the SIP URI format to the E.164 identification (the reduction method is opposite to the forwarding method); after that, the The E.164 is converted to an identifier in the TEL URI format (see the protocol for the conversion method: RFC2806).

The address of the S-CSCF to which the IMS terminal belongs can be queried in the Home Subscriber Server (HSS) by using the obtained TEL URI format identifier.

S106. Send the registration request message to the S-CSCF.

S107. The S-CSCF acquires the authentication information corresponding to the user, and completes authentication and registration.

After the S-CSCF receives the registration request message, it obtains the identification of the SIP URI format, and restores the identification of the SIP URI format to the E.164 identification (the reduction method is opposite to the forwarding method); after that, the The E.164 is converted to an identifier in the TEL URI format (see the protocol for the conversion method: RFC2806).

The obtained TEL URI identifier can be used to query the user authentication information corresponding to the TEL URI identifier in the HSS, that is, the user authentication information corresponding to the user's E.164 identifier can be queried.

Afterwards, user registration is completed according to the flow of the prior art and the query method of this example.

Example 2: Modify the database in the HSS, and convert the E.164 identifier into an identifier in SIP URI format to complete authentication and registration. The specific processing steps of this example are as follows:

S201. The user initiates a registration request using the E.164 identifier as a basic identifier.

Because existing agreement stipulates that SIP URI is the basic mark of IMS, and E.164 mark is subordinate mark, in order to implement the present invention, define that described E.164 mark is also basic mark.

In this way, the user can use the E.164 identifier as the basic identifier to initiate a registration request to the network side.

S202. The IMS terminal converts the E.164 identifier into an identifier in SIP URI format, and adds the identifier in SIP URI format to the registration request message.

The IMS terminal uses the conversion module to add a domain name for identifying E.164 after the E.164 identification.

For example: E.164 number is +46-8-9761234. The converted SIP URI format is identified as sip:4689761234@e164.3gppnetwork.org. The domain name e164.3gppnetwork.org is used to indicate that this is an E.164 number.

Then fill in the SIP URI format identifier into the header field of the registration message to initiate a registration request.

S203. The P-CSCF acquires the address of the I-CSCF in the home network of the IMS terminal.

After receiving the registration request message, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs DNS resolution on the home network address to obtain the address in the home network of the IMS terminal. The address of the I-CSCF.

S204. Send the registration request message to the I-CSCF.

S205. The I-CSCF obtains the address of the S-CSCF to which the IMS terminal belongs.

Since the existing technology only supports querying information from the HSS with the user's original SIP URI ID and TELURI ID, this example first sets the TELURI ID and the E.164 converted SIP URI in the address information database and subscription database of the HSS Correspondence between. In this way, relevant information can be queried indirectly through the SIP URI converted by E.164 through the TELURI identification query supported by the existing technology.

Based on the HSS after the above settings, after the I-CSCF receives the registration request message, it obtains the identification of the SIP URI format, and directly inquires the HSS of the S to which the IMS terminal belongs with the identification of the SIP URI format. - the address of the CSCF.

S206. Send the registration request message to the S-CSCF.

S207. The S-CSCF obtains the authentication information corresponding to the user, and completes authentication and registration.

Based on the HSS after the above settings, after the S-CSCF receives the registration request message, it obtains the identification of the SIP URI format, and directly queries the HSS for the authentication information of the corresponding user with the identification of the SIP URI format , that is, query the authentication information of the user corresponding to the E.164 identifier of the user.

Afterwards, user registration is completed according to the flow of the prior art.

Example 3: Convert the E.164 identifier into an identifier in TEL URI format to complete authentication and registration. The specific processing steps of this example are as follows:

S301. The user initiates a registration request using the E.164 identifier as a basic identifier.

Because existing agreement stipulates that SIP URI is the basic mark of IMS, and E.164 mark is subordinate mark, in order to implement the present invention, define that described E.164 mark is also basic mark.

In this way, the user can use the E.164 identifier as the basic identifier to initiate a registration request to the network side.

S302. The IMS terminal converts the E.164 identifier into an identifier in TEL URI format, and adds the identifier in SIP URI format to the registration request message. (Refer to the protocol for the conversion method: RFC2806)

S303. The P-CSCF acquires the address of the I-CSCF in the home network of the IMS terminal.

After receiving the registration request message, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs DNS resolution on the home network address to obtain the address in the home network of the IMS terminal. The address of the I-CSCF.

S304. Send the registration request message to the I-CSCF.

S305. The I-CSCF acquires the address of the S-CSCF to which the IMS terminal belongs.

Since the existing technology supports information query to the HSS with the identifier in the TEL URI format, the I-CSCF directly obtains the address of the S-CSCF to which the IMS terminal belongs from the HSS with the identifier in the TEL URI format.

S306. Send the registration request message to the S-CSCF.

S307. The S-CSCF obtains the authentication information corresponding to the user, and completes authentication and registration.

Since the existing technology supports information query to the HSS with the identifier in the TEL URI format, the S-CSCF directly obtains the authentication information of the corresponding user from the HSS with the identifier in the TEL URI format, that is, obtains the authentication information corresponding to the E.164 identifier. The user's authentication information.

Afterwards, user registration is completed according to the flow of the prior art.

In order to better solve the problem of number conversion and intercommunication, and simplify the session connection process. The invention provides a session connection method in an IMS system.

The method for connecting an IMS user session is specifically described below with two examples.

Example 4: Set the E.164 converted SIP URI format identifier in the ENUM server to obtain the corresponding SIP URI format identifier when initiating a session with E.164, and further obtain the next-hop address through DNS resolution. to complete the continuation. Referring to Figure 6 and Figure 7, the specific processing steps of this example are as follows:

S401. The IMS calling terminal initiates a session request using the called E.164.

S402. After receiving the session request message, the P-CSCF forwards the session request message to the S-CSCF in the calling party's home network according to the path saved during user registration.

S403. The S-CSCF in the calling terminal's home network correspondingly queries the identifier in the SIP URI format.

The service provider first sets the ID in the SIPURI format after the E.164 ID conversion of each IMS user in the ENUM server.

For example: E.164 number is +46-8-9761234. The converted SIP URI format is identified as sip:4689761234@e164.3gppnetwork.org. The domain name e164.3gppnetwork.org is used to indicate that this is an E.164 number.

When the network side receives the session request, the E.164 identifier of the called user is used to query the identifier of the corresponding SIP URI format in the ENUM server.

If inquire about the sign of corresponding SIP URI format, then think that this called user is an IMS user, and turn to step S404;

Otherwise, consider that the called party is a PSTN or PLMN user, and go to step S406.

S404. Perform DNS resolution on the obtained identifier in the SIP URI format to obtain the I-CSCF address in the home network of the called terminal.

S405. Complete the connection in the home network of the called IMS.

- The I-CSCF in the called home network converts the E.164 identifier in the session request message into an identifier in the TEL URI format (for the conversion method, refer to the protocol: RFC2806), and queries the HSS with the identifier in the TEL URI format The location information of the called terminal;

- carrying the S-CSCF address to which the called terminal belongs in the message responded by the HSS;

- The I-CSCF forwards the session request to the S-CSCF, and the S-CSCF completes the connection.

S406. Complete the connection in the called PSTN or PLMN network.

- After receiving the session request message, the BGCF forwards the session request message to a media gateway control function entity (MGCF);

- The MGCF sends the session request message to the PSTN or the PLMN, and completes the connection according to the prior art.

Example 5: Convert the E.164 identifier into an identifier in TEL URI format, which is used to query the next hop address and complete the connection. Referring to Figure 6 and Figure 8, the specific processing steps of this example are as follows:

S501. The IMS calling terminal initiates a session request with the called E.164 identifier.

S502. After receiving the session request message, the P-CSCF forwards the session request message to the S-CSCF in the calling party's home network according to the path saved during user registration.

S503. The S-CSCF in the calling party's home network converts the E.164 identifier in the session request message into an identifier in TEL URI format.

S504. Query the corresponding next-hop address in the database by using the TELURI.

The database is an internal routing database or an external routing database.

If the next-hop address in the called home network obtained through query is the I-CSCF address, that is, the called terminal is an IMS terminal, then proceed to step S505;

If the obtained next-hop address in the called home network is the address of the border gateway control function entity (BGCF), that is, the called terminal is a public telephone service network (PSTN) terminal or a public land mobile network (PLMN) terminal, then transfer Enter step S506.

S505. Complete the connection in the home network of the called IMS.

-The I-CSCF in the called home network converts the E.164 identifier in the session request message into an identifier in the TEL URI format, and queries the HSS for the location information of the called terminal with the identifier in the TEL URI format;

- carrying the S-CSCF address to which the called terminal belongs in the message responded by the HSS;

- The I-CSCF forwards the session request to the S-CSCF, and the S-CSCF completes the connection.

S506. Complete the connection in the called PSTN or PLMN network.

- After receiving the session request message, the BGCF forwards the session request message to a media gateway control function entity (MGCF);

- The MGCF sends the session request message to the PSTN or the PLMN, and completes the connection according to the prior art.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (20)

1, a method for user registration in the IP multimedia subsystem, is characterized in that, comprises the following steps: A. The user initiates a registration request with the E.164 identifier as the basic identifier; B. The IMS terminal converts the E.164 identifier into a registration identifier conforming to the SIP protocol, and adds the registration identifier to the registration request message; C. A network device in the IMS network completes authentication and registration according to the registration request message. 2. The method according to claim 1, wherein said step C comprises the following steps: C1. The proxy call session control function (P-CSCF) obtains the address of the inquiry call session control function entity (I-CSCF) in the home network of the IMS terminal, and sends the registration request message to the I-CSCF; C2. The I-CSCF obtains the address of the serving call session control function entity (S-CSCF) to which the IMS terminal belongs, and sends the registration request message to the S-CSCF; C3. The S-CSCF obtains the authentication information corresponding to the user, and completes authentication and registration. 3. The method according to claim 2, wherein the registration identifier is a Session Initiation Protocol Universal Resource Identifier (SIP URI). 4. The method according to claim 3, wherein said converting the E.164 identifier into SIPURI is adding a domain name for identifying E.164 after the E.164 identifier. 5. The method according to claim 4, wherein in said step C1, the P-CSCF obtains the home network address of the IMS terminal from the header field of the registration request message, and performs domain name resolution protocol (DNS) on the address. ) to obtain the I-CSCF address in the home network of the IMS terminal. 6. The method according to any one of claims 3 to 5, characterized in that in the step C2, the I-CSCF restores the E.164 and converts the E.164 into a TEL URI format for The Home Subscriber Server (HSS) acquires the address of the S-CSCF to which the IMS terminal belongs. 7. The method according to claim 6, characterized in that in the step C3, the S-CSCF restores the E.164, and converts the E.164 into a TEL URI format to obtain the user's ID from the HSS. Authentication information. 8. The method according to any one of claims 3 to 5, characterized in that establishing a link between the address information and authentication information set in the Home Subscriber Server (HSS) and the SIP URI after the E.164 conversion In the step C2, the I-CSCF directly queries the address of the S-CSCF to which the IMS terminal belongs with the registration identifier. 9. The method according to claim 8, characterized in that in the step C3, the S-CSCF directly inquires the user's authentication information in the HSS with the registration ID. 10. The method according to claim 2, wherein the registration identifier is a TEL URI. 11. The method according to claim 10, wherein in the step C1, the P-CSCF acquires the home network address of the IMS terminal from the header field of the registration request message, and performs DNS protocol analysis on the address to obtain the address The address of the I-CSCF in the home network of the IMS terminal. 12. The method according to claim 10 or 11, characterized in that in the step C2, the I-CSCF obtains the address of the S-CSCF to which the IMS terminal belongs directly from the HSS with the registration ID. 13. The method according to claim 12, wherein in the step C3, the S-CSCF obtains the user's authentication information directly from the HSS with the registration ID. 14. A method for session connection in an IP multimedia subsystem, comprising the following steps: The IMS calling terminal initiates a session request with the called E.164 identifier; In the home network of the calling terminal, converting the E.164 identifier into an identifier (URI) in a common resource format, and obtaining the next-hop address in the home network of the called terminal with the URI; Send the session request to the next hop address, and complete the connection in the home network of the called terminal. 15. The method according to claim 14, characterized in that converting the E.164 identifier into a URI and using the URI to obtain the next-hop address in the home network of the called terminal is based on the configuration of the E.164 conversion Query the corresponding SIPURI of the called party in the E.164 identification translation protocol (ENUM) server of the subsequent SIP URI; and Perform DNS resolution on the SIP URI to obtain the next hop address. 16. The method according to claim 14, characterized in that converting the E.164 identifier into a URI and using the URI to obtain the next hop address in the home network of the called terminal is the S- The CSCF converts the called E.164 identifier into a TEL URI, and uses the TEL URI to query the corresponding next-hop address in the database. 17. The method according to claim 16, wherein the database is an internal routing database or an external routing database. 18. The method according to any one of claims 14 to 17, wherein if the obtained next-hop address is an I-CSCF address, completing the connection in the home network of the called terminal includes the following steps: - the I-CSCF queries the HSS for the location information of the called terminal; - carrying the S-CSCF address to which the called terminal belongs in the message responded by the HSS; - The I-CSCF forwards the session request to the S-CSCF, and the S-CSCF completes the connection. 19. The method according to any one of claims 14 to 17, wherein if the obtained next-hop address is the address of the Border Gateway Control Function (BGCF), the connection in the home network of the called terminal is completed , including the following steps: - the BGCF forwards the session request to the Media Gateway Control Function (MGCF); - The MGCF sends the session request to the Public Telephone Service Network (PSTN) or Public Land Mobile Network (PLMN), and completes the connection. 20. An IMS terminal, comprising: a terminal body, It is characterized in that the IMS terminal also includes: A conversion module, which is set inside the terminal body, is used to convert the E.164 identification into a registered identification conforming to the SIP protocol.

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