WO2008011790A1

WO2008011790A1 - Method, system and network apparatus for setting up session

Info

Publication number: WO2008011790A1
Application number: PCT/CN2007/001877
Authority: WO
Inventors: Hua Cheng; Hao Lai; Youzhu Shi
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-07-18
Filing date: 2007-06-14
Publication date: 2008-01-31
Also published as: CN101110790A

Abstract

This invention presents a method, system and network apparatus for setting up a session. The method includes steps of: session participant sends session initiated protocol SIP message, which carries session description protocol SDP offer message, to network in the first session; the network joins session intermediate node to session path after the SIP message received by the network; the session intermediate node receives and relays data information carried by the session. The method otherwise includes steps of: session participant sends SIP message, which carries session description protocol SDP offer message, to network, said SIP message is used for setting up the second session; proxy call session control function, and/or service call session control function join/s session intermediate node to session path after the SIP message received by the network; the session intermediate node receives and relays data information carried by the session. This invention can efficiently join the intermediate node to session path, and meet application needs of session.

Description

Method, system and network device for establishing a session

This application is required to be submitted to the China Patent Office on July 18, 2006, the application number is 200610103305.0, the invention titled "the method of establishing a session, the priority of the Chinese patent application, and the Chinese Patent Office submitted on August 3, 2006." The priority of the Chinese Patent Application No. 200610109251.9, entitled "Method of Establishing a Session", the entire contents of which is incorporated herein by reference.

Technical field

The present invention relates to the field of network communication technologies, and in particular, to a method, system and network device for establishing a tongue.

Background technique

SIP (Session Initiated Protocol) is an application layer protocol for establishing, modifying, and terminating multimedia sessions in an IP network. Applications include voice, video, games, messaging, call control, and online services. SIP establishes a dialogue before establishing a session. The conversation is a kind of connection relationship that lasts for a certain period of time. During the session establishment process, the conversation message delivery path is determined. Once the conversation is established, subsequent SIP messages must be delivered in accordance with the message path of the conversation.

The SDP (Session Description Protocol) provides information to give various types of communication, communication methods, parameters of communication methods, and communication addresses that can be used to establish a session. The SDP response information is given in the SDP providing information. The type of communication, communication method, communication method parameters, and communication address used to establish the session.

The session path is composed of address information of one or more session contact nodes, and the session contact node other than the session contact node where the session participant is located is the session intermediate node. After the session negotiation succeeds, and before any data information is passed in the tongue, a session channel is established between adjacent session contact nodes in the session path, and the session contact node where the session participant is located transmits the data transmitted in the session in the session channel. Information, the data information passed in the session reaches the session contact node where the other participants of the session are located through the tongue channel established between the session contact nodes. The data information transmitted in the session is a data packet transmitted through the Transmission Control Protocol (TCP) or the Real Time Transfer Protocol (RTP) protocol. Therefore, the establishment process of the session channel may be a process of establishing a TCP, or The process of establishing RTP. If a new protocol emerges in the future for passing data information in the session, the establishment process of the session channel is defined by the new protocol. Cheng.

When the server uses B2BUA (Back-to-Back User Agent), the server may only retain the address information of the first contact node in the session path before sending SDP information due to security reasons such as topology hiding. Or, only the address information of the first session contact node in the session path is reserved before the SDP response message is sent.

Sessions can be divided into audio sessions, video sessions, data sessions, message sessions, and more. A message session is used to pass a series of associated instant messages between the parties, and other video sessions, audio sessions, and data sessions are collectively referred to as non-message sessions. MSRP (Message Session Relay Protocol) is used to establish a message session. The message session participant carries the SDP information in the SIP message, and the SDP provides the session path information carrying the MSRP. After the SDP negotiation succeeds, the session contact node where the message session participant is located and the other session contact node in the session path of the MSRP establish a TCP (Transmission Control Protocol) connection with the adjacent tongue contact node, where the session participant is located. The session contact node uses the SEND command on the TCP connection to deliver instant messages. The session intermediate node in the MSRP session path receives and forwards the instant message delivered in the TCP connection as the relay node of the MSRP. The data information passed in the MSRP session is the MSRP packet passed through the TCP protocol.

IMS (Internet Multiedia Subsystem, IP Multimedia Subsystem) is the core subsystem of the next generation network. It adopts the packet domain as the bearer channel for its upper layer control signaling and media transmission, and introduces the SIP protocol as the service control protocol. It is simple and easy to expand by using SIP. The combination of convenient media features provides a rich multimedia service by separating service control from bearer control. The main functional entities in the MS include: Call Session Control Function CSCF (Call Session Control Function) that controls the functions of session participant registration, session control, etc. ^ Application Server AS (Application Server) providing centralized management of various business logic functions The home subscriber server (HSS) of the party subscription data and the MGCF (Media Gateway Control Function) for implementing interworking with the circuit-switched network, the session participant passes the current location proxy node P-CSCF ( The proxy CSCF) accesses the MS, and the session and service trigger control and the service control interaction with the AS are completed by the home domain service node call control unit of its registered place.

In IMS, the process of establishing a message session through a message session intermediate node is as follows:

By the application server as the message session intermediate node, the S-CSCF (Service CSCF) entity is based on the touch The sending rule sends a call request message carrying the SDP providing information of the message session to the message session intermediate node, and the message session intermediate node adds its own address information to the message session path, and is received by the message session intermediate node after the message session negotiation is successful. And forwarding the data message passed in the message session. In this method of establishing a message session, the message path is determined during the processing of the call request message. Since the SDP providing information carried in the call request message does not include the description information of the message session during the non-message session, the S-CSCF entity does not forward the message to the message session intermediate node, and the message session intermediate node does not join the message session. In the message path. When the SDP providing information of the message session is sent again, the message session intermediate node cannot be obtained because the message session intermediate node is not in the message path, and finally the message session intermediate node cannot receive and forward the data information transmitted in the message session. It can be seen that this method of establishing a message session cannot be applied to the case of adding a message session during a non-message session.

For this application requirement, a solution is proposed in the prior art: after the participant establishes a non-message session, if the message session is desired, the participant sends a message session to the destination participant, requesting Create a new conversation that is different from the conversation in which the non-message session is located.

In the process of implementing the present invention, the inventors have found that the existing method of adding a message session in a non-message process has at least the following disadvantages: the network cannot associate a new message session request with the original session, and the network will be new. The message session requests redistribution of routes, reallocation of session resources, re-accounting, and when the network determines the state of the terminal, the new message session request is rejected if the original session is not released, resulting in the inability to establish a message session.

In addition, in the process of establishing a message session, if the SDP providing information is not carried in the call request message, but the SDP providing information is carried in the response message of the call request message, the foregoing method cannot respond to the call request message carrying the SDP providing information. The message is triggered to the message session intermediate node, and the message session intermediate node cannot add its own address information to the message session path.

In addition, since the session establishment process defined by 3GPP (Third Generation Partnership Projects) stipulates that the message path of the session in which the session is located cannot be modified after the session is established, after the non-message session is established, if the message session intermediate node is not in the non-message session In the message path of the conversation where the message session is located, the network cannot insert the message intermediate node into the non-message. Establish a message session in the conversation. For non-messages, there is also the problem that the intermediate nodes cannot be added to the session path. For example: After the session is established, it needs to be monitored. In this case, the device for monitoring needs to be added as a session intermediate node to the subsequent session. The session is established to obtain the listener data. At this time, if the device for monitoring is not in the message path of the session where the ^ is located, the network cannot insert the listening device as the session intermediate node into the session path, so that the network monitoring fails.

Summary of the invention

The embodiment of the invention provides a method, a system and a network device for establishing a session, so as to insert a session intermediate node into a session path to meet the usage requirement of the session.

To this end, Embodiment 4 of the present invention provides the following technical solutions:

A method of establishing a session, the method comprising:

The session participant sends a session initiation protocol SIP message carrying the session description protocol SDP providing information to the network in the first session;

After receiving the SIP message, the network adds the session intermediate node to the session path;

The session intermediate node receives and forwards data information passed in the session.

A method of establishing a session, the method comprising:

The session participation direction sends a session initiation protocol that carries the session description protocol SDP to provide information.

a SIP message, where the SIP message is used to establish a second session;

After receiving the SEP message, the network joins the session intermediate node to the session path by the proxy call session control function entity and/or the service call session control function entity;

The tongue intermediate node forwards the data packets delivered in the session.

A system for establishing a tongue, comprising: a message dialogue entity and a session intermediate node,

The message conversation entity is configured to receive a session initiation protocol SIP message that is sent by the session participant in the first session and that carries the session description protocol SDP providing information, and adds the session intermediate node to the session path, and includes:

a message receiving unit, configured to receive a SIP message that is sent by the session participant in the first session and that carries the session description protocol SDP providing information;

a session intermediate node adding unit, configured to add the session intermediate node to the session path, where the session intermediate node is configured to receive, and/or forward data information delivered in the session. A system for establishing a session, comprising: a message conversation entity and a session intermediate node, The message dialogue entity is configured to receive a session initiation protocol SIP message that carries the session description protocol SDP providing information sent by the session participant in the first session, and send the SDP providing information or the SDP response message to the session intermediate node. SIP message;

The session intermediate node is configured to add itself to the session path, and receive, and/or forward data information delivered in the session, including:

a receiving unit, configured to receive a SIP message sent by the message conversation entity and data information delivered in the session;

An address adding unit, configured to add address information of the session intermediate node to the session path, and a forwarding unit, configured to forward the data information delivered in the tongue.

A network device is configured to add address information of a session intermediate node in which a message is active to a session path, including:

a message receiving unit, configured to receive a session initiation protocol SIP message that is sent by the session participant in the first session and that carries the session description protocol SDP providing information;

The session intermediate node adds a unit for adding the session intermediate node to the tongue path.

It can be seen from the technical solution provided by the foregoing embodiments of the present invention that the session participant sends a session request message to the network when the session participant requests to establish a session, and after receiving the session request message, the network adds the session intermediate node to the session. In the session path, the session intermediate node terminates and forwards the data information delivered in the session, thereby satisfying various application requirements of the session.

In the embodiment of the present invention, not only the function of adding the session intermediate node to the session path but also the proxy call control function entity or the service call session control function entity in the network may be completed by the application server. Therefore, operators can flexibly deploy networks and provide better session services.

DRAWINGS

1 is a flow chart showing an implementation of a first embodiment of the method of the present invention;

2 is a flowchart of an implementation of a second embodiment of the method of the present invention;

3 is a flowchart of an implementation of a third embodiment of the method of the present invention;

4 is a schematic structural diagram of a system of an existing IMS;

Figure 5 is a flow chart showing an implementation of the fourth embodiment of the method of the present invention;

Figure 6 is a flowchart showing an implementation of a fifth embodiment of the method of the present invention; 7 is a schematic block diagram of a first embodiment of a system for establishing a session according to the present invention;

FIG. 8 is a schematic block diagram of a second embodiment of a system for establishing a session according to the present invention.

detailed description

A method for establishing a session in the embodiment of the present invention is that the session participant sends a SEP message carrying the SDP providing information to the network in the first session, and after receiving the SIP message, the network adds the session intermediate node to the session path. Data information passed in the session is received and forwarded by the session intermediate node. The network obtains the address information of the session intermediate node, and adds the session intermediate node to the session path; or the network sends a SIP message carrying the SDP providing information or the SDP response information to the session intermediate node, and the session intermediate node sets itself Join the path to the tongue. The first conversation represents an established conversation, that is, the session established by the embodiment does not require a new conversation to be established, but rather a new session is established in the established conversation.

Another method for establishing a session in the embodiment of the present invention is that the session participates in the direction sending and carrying of the network.

The SDP provides a SIP message for the information, and the SIP message is used to establish a second session. After receiving the SIP message, the network adds the session intermediate node to the session path by the P-CSCF entity and/or the S-CSCF entity. The data information passed in the session is received and forwarded by the intermediate node. The second dialog represents a conversation that has not yet been established, that is, the session established by the embodiment needs to establish a new conversation in which a new session is established.

In order to make those skilled in the art better understand the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to Figure 1, there is shown an implementation flow of a first embodiment of the method of the present invention. In this embodiment, a method is described in which a participant sends a SIP message carrying SDP providing information to a network in a first session, and the network obtains address information of a session intermediate node, and adds a tongue intermediate node to the session path. Example. The process includes the following steps: A non-message session is established between session participant A and session participant B.

1. Session participant A sends an increase message session request message to network A, which is carried in the message.

The SDP provides the following information:

INVITE sip:participant_B@homeB.net SIP/2.0

Content-Type: application/sdp Content-Length: (...) v=0

o=- 2987933615 2987933615 IN IP6 5555::aaa:bbb:ccc:ddd

S-- c=IN IP6 5555::aaa:bbb:ccc:ddd

t=0 0

m=message 3402 TCP/MSRP *

a=path:msrp://[5555:: aaa:bbb:ccc:ddd] :3402/s 111271;tcp

2. The network A obtains the address information of the session intermediate node A through the data configuration. The network A adds the address information of the session intermediate node A to the SDP providing information, and sends the modified message to the network B. The modified message is as follows:

INVITE sip: participant— B@homeB.net SIP/2.0

Content-Type: application sdp

Content-Length: (...) v=0

o=- 2987933620 2987933620 IN IP6 7777::eee:ddd:ccc:aaa

s=- c=IN IP6 7777::eee:ddd:ccc:aaa

t=0 0

m=message 3927 TCP/MSRP *

a=path:msrp:〃[7777: :eee:ddd:ccc:aaa] :3927/s222371;tcp

3. The network B obtains the address information of the session intermediate node B through the data configuration, and the network B adds the address information of the session intermediate node B to the SDP providing information, and sends the modified message to the session participant B, the modified message. as follows: INVITE sip: participant— B@homeB.net SIP/2.0

Content-Type: application/sdp

Content-Length: (...) v=0

o=- 2987933630 2987933630 IN IP6 9999:xcc:aaa:bbb:ddd

s=- c=IN IP6 9999::ccc:aaa:bbb:ddd

t=0 0

m=message 3333 TCP/ SKP *

a=path:msrp :〃[9999: :ccc:aaa:bbb:ddd]:3333/s317121;tcp

4. The session participant B sends a success response message to the network B, and the message carries the SDP response message as follows:

SIP/2.0 200 OK

Content-Type: application/sdp

Content-Length: (...) v-0

O-- 29879336302987933630IN IP6 5555::eee:fff:aaa:bbb

s=- c=IN IP6 5555::eee:fff:aaa:bbb

t=0 0

m=message 3402 TCP MSRP *

a=path:msrp :〃[5555:: eee:fff:aaa:bbb] :3402/s417121;tcp

5. Network B sends an ACK (Acknowledgement) response message to Session Participant B. 6. The session participant B establishes a TCP connection to the session intermediate node B; or the network B transmits the address information of the session participant B to the session intermediate node B through a message, and the session intermediate node B establishes a TCP connection to the session participant B.

7. Network B sends a success response message to network A. The response message adds the address information of session intermediate node B to the SDP response message, as follows:

SIP/2.0 200 OK

Content-Type: application/sdp

Content-Length: (...) v=0

o=- 2987933640 2987933640 IN IP69999::ccc:aaa:bbb:ddd

s=- c=IN IP6 9999: :ccc:aaa:bbb:dddt=0 0

m=message 3402 TCP MSRP *

a=path:msrp://[9999:: ccc:aaa:bbb:ddd] :3402/s317122;tcp

8. Network A sends an ACK message to Network B.

9. Network A transmits the address information of the session intermediate node B to the session intermediate node A through a message, and the session intermediate node A establishes a TCP connection to the session intermediate node B; or the network B transmits the address information of the session intermediate node A to the message through the message The tongue intermediate node B, the session intermediate node B establishes a TCP connection to the session intermediate node A.

10. The network A sends a success response message to the session participant A, and the address information of the session intermediate node A is added to the SDP response message in the success response message, as follows:

SIP/2.0200 OK

Content-Type: application/sdp

Content-Length: (...) V-0

O-- 2987933642 2987933642 IN IP6 7777::eee:ddd:ccc:aaa

s=- c-IN IP67777::eee:ddd:ccc:aaa

t=0 0

M-message 3927 TCP/MSRP *

a=path:msrp://[7777::eee:ddd:ccc:aaa]:3927/s222372;tcp

11. After the session participant A receives the success response message, it sends an ACK message to Network A.

12. The session participant A and the session intermediate node A establish a TCP connection; or the network A transmits the address information of the session participant A to the session intermediate node A through a message, and the session intermediate node A establishes a TCP connection to the session participant A.

13. Session participant A sends the data information passed in the message session to session intermediate node A.

14. Session intermediate node A sends the data information passed in message ^ to session intermediate node B. 15. Session intermediate node B sends the data information passed in the message session to session participant B.

16 - 18. Session participant B feedback success response message.

The message interaction between the network A and the session intermediate node A or the network B and the session intermediate node B in step 2 and step 3 may adopt the SIP protocol, the H.248 protocol, the HTTP (Hypertext Transfer Protocol) protocol, The traditional circuit domain protocol and the Diameter protocol obtain the address information of the session intermediate node through the interaction.

The message interaction between the network 6, A, and 12 in the network and between the session intermediate node A or the network B and the session intermediate node B may adopt the SIP protocol, the H.248 protocol, the HTTP protocol, the traditional circuit domain protocol, and the Diameter protocol. The session intermediate node obtains address information of other nodes through the interaction.

If the SDP providing information is carried in the session request response message, and the acknowledgment message of the session request response message carries the SDP response information, the embodiment only needs to adjust the time when the network adds the address information of the session intermediate node to the session path: When receiving the confirmation message of the session request response message and the session request response message, the address information of the session intermediate node is added to the session path.

Referring to Figure 2, there is shown an implementation flow of a second embodiment of the method of the present invention. In this embodiment, the participant sends a SIP message carrying the SDP providing information to the network in the first session, and the network sends the SIP message carrying the SDP providing information or the SDP response information to the session intermediate node, where An example of a method in which a session intermediate node adds itself to the tongue path. The process includes the following steps:

1. The session participant A sends an add message session request message to the network A, and the message carries the SDP information.

a. The network A sends a session request message to the session intermediate node A. The destination address information in the message is the address information of the session intermediate node A, for example: Request-uri is application_A@homeA.net, and the message carries the session participant A. The SDP provides information.

The session intermediate node A forwards the session request message to the network A, and the message carries the modified SDP providing information of the session intermediate node A.

2. Session intermediate node A adds its own address information to the SDP provisioning information, and sends the modified message to Network B.

c. The network B sends a session request message to the session intermediate node B. The destination address information in the message is the address information of the session intermediate node B. For example, the request-uri is application_B@homeB.net, and the message carries the information provided by the SDP.

d. The session intermediate node B sends a session request message to the network B, and the message carries the modified SDP providing information of the session intermediate node B.

3. Network B adds the address information of the session intermediate node B to the SDP providing information, and sends the modified message to the session participant B.

The session participant B sends a success response message to the network B, and the message carries the SDP response message. e. The network B sends a success response message to the session intermediate node B, where the message carries the SDP response information of the session participant B.

f. The session intermediate node B sends a confirmation message of the success response message to the network B.

5. Network B sends an ACK response message to session participant B.

6. Session participant B establishes a TCP connection to session intermediate node B; or session intermediate node B establishes a TCP connection to session participant B.

g. The session intermediate node B sends a success response message to the network B, and the session intermediate node The address information of B is added to the SDP response message.

7. The network B sends a success response message to the network A, and the address information of the session intermediate node B is added to the SDP response message in the response message.

h. Network A forwards the success response message to session intermediate node A.

i. Session intermediate node A sends a response message to network A.

8. Network A sends an ACK message to Network B.

j. Network B sends a response message to session intermediate node B.

9. Network A transmits the address information of the session intermediate node B to the session intermediate node A through a message, and the session intermediate node A establishes a TCP connection to the session intermediate node B; or the session intermediate node B establishes a TCP connection to the session intermediate node A.

10. The network A sends a success response message to the session participant A, and the address information of the session intermediate node A is added to the SDP response message in the success response message.

12. Session participant A and session intermediate node A establish a TCP connection; or session intermediate node A establishes a TCP connection to session participant A.

14. The tongue intermediate node A sends the data information passed in the message session to the session intermediate node B.

15. Session intermediate node B sends the data information passed in the message session to session participant B. 16 - 18. Session participant B feedback success response message.

If the SDP providing information is carried in the session request response message, and the acknowledgment message of the session request response message carries the SDP ACK message, the embodiment only needs to adjust the time when the network adds the address information of the session intermediate node to the session path: When receiving the session request response message, the message is sent to the session intermediate node, and the session intermediate node adds itself to the session path; when the network receives the confirmation message of the session request response message, the network sends a tongue request response to the intermediate node of the tongue. Message, the session intermediate node adds itself to the session path.

Referring to Figure 3, there is shown an implementation flow of a third embodiment of the method of the present invention.

In this embodiment, the participant sends a SIP message carrying the SDP providing information to the network in the first session, and the network sends the SIP message carrying the SDP providing information or the SDP response information to the intermediate node of the tongue. An example of a method in which a session intermediate node adds itself to the tongue path. Assume that the SIP session between the network A and the network B that establishes the non-message session where the session participant A and the session participant B are located is set as: Call-ID is 425928@homeA.net, to-tag is 7742, from-tag For 6472. The process includes the following steps:

1. Same as step 1 in the embodiment shown in Figure 1.

2. Network A sends a session request message, and network A uses the address information of the entity in network B in the message path of the non-message session, or the address information that network B can recognize as the destination address of the message session request message, in the session. The request message carries the information of the original message path by using the path of the session request message, and the session request message carries the media information of the session participant A, where the message includes the message negotiation information, and the network A according to the trigger rule The session request message is sent to the session intermediate node A. The SDP providing information carried in the session request message is as follows: Step 1 in Embodiment 101, and other information carried in the session request message is as follows:

INVITE sip: application— B@homeB.net SIP/2.0

To: < application_B @ omeB .net >

From: < application— A@homeB.net >;tag=7744

Replaces: 425928@homeA.net;to-tag=7742;firom-tag=6472

3. The session intermediate node A adds its own address information to the SDP providing information, and the session intermediate node A forwards the modified session request message to the network A, where the request message carries the modified SDP providing information of the session intermediate node A. Step 2 in the embodiment shown in Figure 1.

4 ~ 5. Network A sends a ^^ request message to network B, which forwards the session request message to session intermediate node B according to the triggering rule.

6. The session intermediate node B adds its own address information to the SDP providing information, and the session intermediate node B forwards the modified session request message to the network B, where the session request message carries the modified SDP providing information of the intermediate node B. , step 3 in the embodiment shown in FIG.

7. The network B sends the release conversation message to the network A in the original conversation according to the information of the original message path that is replaced by the path of the session request message carried in the session request message, and replaces the original conversation with the session created by the session request message. The conversation in the message path.

8. Step 3 in the same embodiment as shown in FIG. 9~ 13. The session participant B sends a success response message to the network B, and the network B forwards the success response message to the session intermediate node B, and the session intermediate node B adds itself to the SDP response message carried in the success response message. The session intermediate node B and the session participant B establish a TCP connection, and the message session negotiation result information carried in the success response message is as shown in step 4 in the embodiment shown in FIG.

14 - 19. The session intermediate node B sends a success response message to the session intermediate node A, and the intermediate node A and the session intermediate node B establish a TCP connection, and the message session negotiation result information carried in the success response message is as shown in FIG. Step 7 in the embodiment.

20 - 24. The session intermediate node A sends a success response message to the network A, and the network A forwards the success response message to the tongue participant A, and the session intermediate node A adds itself to the SDP response message carried in the success response message. The session intermediate node A and the session participant A establish a TCP connection, and the SDP response information carried in the success response message is as shown in step 10 in the embodiment shown in FIG.

25 - 30. Steps 13 ~ 18 in the same embodiment as shown in Figure 1.

In the above embodiments, the operation of adding the session intermediate node address information to the message path may be performed by the proxy call session control function entity, or the serving call session control function entity, or the application server.

The following is an example of the IMS system, which is described in detail.

Referring to Figure 4, Figure 4 shows the system architecture of the IMS in the prior art:

The CSCF entity is used to control functions such as user registration and session control, and includes: an S-CSCF entity 41 and a P-CSCF entity 42; an AS (Application Server) 43 is used to provide various service inverse control functions; (Home Subscriber Server, Home Subscriber Server) 44 is used to centrally manage user subscription data; MGCF (Media Gateway Control Function) entity 45 is used to implement interworking with the circuit switched network; the user accesses through the proxy node P-CSCF The IMS; session and service trigger control and the service control interaction with the AS are completed by the home domain service node S-CSCF of its place of registration.

Based on the IMS system, the session intermediate node can be on the P-CSCF entity, on the S-CSCF entity, or on the AS or other functional entities in the system.

Referring to Figure 5, there is shown an implementation flow of a fourth embodiment of the method of the present invention. In this embodiment, the session participant is sent a SIP message carrying the SDP providing information to the network in the first session, and the network sends the SIP message carrying the SDP providing information or the SDP response information to the session intermediate node. An example of a method in which a session intermediate node adds itself to the session path. The process includes the following steps:

1' ~ 10'. The session participant A sends a non-message session request message to the network, and the network A forwards the non-message session request message to the AS-A as the intermediate node of the message session, and the AS-A sends the non-message session request message. Forwarding to the network B, the network B forwards the non-message session request message to the AS-B as the intermediate node of the message session, and the AS-B forwards the non-message session request message to the session participant B, the participant B to the participant A The success response message is fed back, and the message path of the first session is established, and both AS-A and AS-B, which are intermediate nodes of the message session, are in the message path of the first session.

1 ~ 2. The session participant A sends a message session request message to the network A in the first session, and carries the message information in the message, and the network A forwards the message session request message to the AS-A.

3. The AS-A serving as the session session intermediate node for the session participant A adds its own message session address information to the SDP providing information carried in the message session request message, and sends the modified session request message to the network B. The message carries the modified SDP providing information.

4~5. The AS-B serving as the session participant intermediate node for the session participant B adds its own message session address information to the SDP providing information carried in the message session request message, and sends the modified message session request message. To the session participants

6-10. The session participant B feeds back the success response message, and the AS-B adds its own message session address information to the SDP response message carried in the success response message, and sends the modified success response message to the AS-A. AS-B establishes a TCP connection with Participant B.

11 - 14. AS-A adds its own message session address information to the SDP response message carried in the success response message, and sends the modified success response message to session participants A, AS-A and AS-B. Establish a TCP connection.

15-17. Session Participant A establishes a TCP connection with AS-A.

18-23. AS-A and AS-B terminate and forward the message information sent by session participant A and session participant B in the message session.

The AS in the embodiment may also be a P-CSCF, or an S-CSCF. If the SDP providing information is carried in the session request response message, and the acknowledgment message of the session request response message carries the SDP response information, the embodiment only needs to adjust the time when the network adds the address information of the session intermediate node to the session path: The session intermediate node is added to the session path when receiving the session request response message; the network adds the session intermediate node to the session path when receiving the confirmation message of the session request response message.

Referring to Figures 6, Figure 6 shows an implementation flow of a fifth embodiment of the method of the present invention.

In this embodiment, the session participation direction network sends a SIP message carrying the SDP providing information, and the SIP message establishes a second session. After the network receives the SIP message, the proxy call session control function entity, and/ An example of a method in which a serving call session control function entity adds a session intermediate node to a session path. The process includes the following steps:

1. Session participant A sends a message session request message to S-CSCF-A.

2. The S-CSCF-A adds its own message session address information to the SDP providing information carried in the message session request message, and sends the modified message request message to the S-CSCF-B.

3. The S-CSCF-B adds its own message session address information to the SDP providing information carried in the message session request message, and sends the modified message session request message to the session participant B.

4~ 5. The session participant B feeds back the success response message, and the S-CSCF-B adds its own message session address information to the SDP response message carried in the success response message, and sends the modified success response message to the S. -CSCF-A.

6~ 9. The S-CSCF-A adds its own message session address information to the SDP response message carried by the success response message, and sends the modified success response message to the session participant A.

10. A TCP connection is established between session participant A and S-CSCF-A.

11. Establish a TCP connection between S-CSCF-A and S-CSCF-B.

12. Establish a TCP connection between S-CSCF-B and session participant B.

13 ~ 18. S-CSCF-A and S-CSCF-B terminate and forward the message information sent by session participant A and session participant B in the message session.

The S-CSCF in the embodiment may also be a P-CSCF.

If the SDP providing information is carried in the session request response message, and the acknowledgment message of the session request response message carries the SDP ACK message, the embodiment only needs to adjust the timing at which the network adds the address information of the session intermediate node to the session path: proxy call Session control function entity, and/or service call The session control function entity adds the session intermediate node to the session path when receiving the session request response message; the proxy call session control function entity, and/or the service call session control function entity, when receiving the confirmation message of the session request response message The session intermediate node is added to the session path.

The foregoing embodiment further exemplifies the method of the embodiment of the present invention by using the IMS system as an example, but the embodiment of the present invention is not limited to the current IMS system network, and is applicable to other technologies developed based on the IMS network architecture. Network, as long as it meets the network architecture.

In the foregoing embodiments, the SDP providing information in the SIP message or the address information of the tongue contact node carried in the SDP response information may also be a list of address information of multiple session contacting nodes.

The above embodiments use the message session as an example to describe the method in the embodiment of the present invention. For the audio session, the video session, and the data session, the processing flow is also applicable, and only the session description protocol information needs to be modified into an audio session and a video session. The session description protocol information of the data session can be used, and the specific process is not described here.

The establishment of a TCP connection between the session intermediate nodes and between the session intermediate nodes and the session participants in the above embodiments is an example of an MSRP-based message session, which is used to illustrate how to intermediate between session intermediate nodes and intermediate nodes. The connections required by the tongue participants are established. Other types of connections required for the tongue can be derived according to an example. For a session that does not require a connection, the process of establishing a connection can be omitted.

In the foregoing embodiments, when the session intermediate node is controlled by the P-CSCF, or the S-CSCF, or the AS, the P-CSCF, or the S-CSCF, or the AS and the session intermediate node may perform a message exchange delivery session. Information, and then the session intermediate node is added to the session path by the P-CSCF, or the S-CSCF, or the AS.

Referring to Figure 7, a block diagram of a first embodiment of a system for establishing a session of the present invention is shown: The system includes: a message dialogue entity 71 and a session intermediate node 72. The message dialogue entity 71 is configured to receive the SIP message carrying the SDP providing information sent by the session participant in the first session, and add the session intermediate node 72 to the session path, where: the message receiving unit 711 and the session intermediate node Add unit 712. The message receiving unit 711 is configured to receive a SIP message carrying the session description protocol SDP providing information sent by the session participant in the first session; the session intermediate node adding unit 712 is configured to add the session intermediate node to the session path. The session intermediate node 72 is configured to receive, and/or forward, the data information communicated in the tongue. As shown in FIG. 7, the implementation of the session intermediate node adding unit 712 includes: an address information obtaining subunit 701 and an adding subunit 702, and the address information obtaining subunit 701 is configured to obtain the address information of the session intermediate node 72 through the network configuration. Or interacting with the session intermediate node 72 to obtain its address information; the adding sub-unit 702 is configured to add the address information of the session intermediate node 72 to the SDP providing information, and/or the SDP response information.

In this embodiment, the message dialogue entity 71 may be a P-CSCF having its function, or an S-CSCF, or an AS.

To this end, the embodiment of the present invention further provides a network device, which is used to add the address information of the session intermediate node in the message session to the session path, and has the same structure as the message dialogue entity 71 in FIG. Praise.

The detailed process of establishing a session using the system of this embodiment can be referred to the description in the method of the previous embodiment of the present invention.

Referring to Figure 8, a block diagram of a second embodiment of a system for establishing a tongue of the present invention is shown: The system includes: a message dialogue entity 81 and a session intermediate node 82. The message dialogue entity 81 is configured to receive a SIP message carrying the session description protocol SDP providing information sent by the session participant in the first session, and send a SIP message carrying the SDP providing information or the SDP response information to the session intermediate node 82. The session intermediate node 82 is configured to add itself to the session path, and receive, and/or forward data information delivered in the session, including: a receiving unit 821, an address adding unit 822, and a forwarding unit 823. The receiving unit 821 is configured to receive the SIP message sent by the message dialogue entity 81 and the data information transmitted in the session; the address adding unit 822 is configured to add the address information of the session intermediate node 82 to the session path; and the forwarding unit 823 is configured to forward Data information passed in the session.

In this embodiment, the message conversation entity 81 may be a P-CSCF having its function, or an S-CSCF, or an AS.

It can be seen that, by using the system of the embodiment of the present invention, not only the function of adding the session intermediate node to the tongue path can be completed by the AS, but also the function can be completed by the P-CSCF or the S-CSCF in the network, thereby enabling Operators have the flexibility to deploy networks and provide better session services.

While the invention has been described by the embodiments of the present invention, it will be understood that

Claims

Rights request

A method for establishing a session, the method comprising:

The network receives a session initiation protocol SIP message that is sent by the session participant in the first session and that carries the session description protocol SDP to provide information;

The session intermediate node is added to the session path by the network or the session intermediate node itself; the session intermediate node receives and forwards the data information delivered in the session.

2. The method according to claim 1, wherein the step of the network adding the session intermediate node to the session path comprises:

The network acquires address information of the session intermediate node;

The session intermediate node is added to the session path according to the address information.

The method according to claim 2, wherein the step of adding the session intermediate node to the session path according to the address information comprises:

The network adds the address information of the session intermediate node to the SDP providing information, and/or the SDP answer message.

The method according to claim 2, wherein the step of acquiring, by the network, the address information of the session intermediate node comprises:

The network obtains the address information of the session intermediate node through the network configuration; or

The network interacts with the session intermediate node to obtain the address information of the session intermediate node.

The method according to claim 4, wherein the step of the network interacting with the session intermediate node to obtain the address information of the session intermediate node comprises:

The network interacts with the session intermediate node through a SIP protocol message, or an H.248 protocol message, or a Hypertext Transfer Protocol HTTP message, or a legacy circuit domain protocol message, or a Diameter protocol message, to obtain address information of the intermediate node of the tongue.

The method according to claim 1, wherein the step of the session intermediate node adding the session intermediate node to the session path by itself comprises:

The network sends a SIP message carrying the SDP providing information or SDP response information to the session intermediate node;

After receiving the SIP message, the session intermediate node adds itself to the session path.

7. The method according to claim 6, wherein the step of the session intermediate node adding itself to the session path comprises:

The session intermediate node adds its own address information to the SDP provisioning information, and/or SDP response information.

8. The method according to claim 1, wherein the functional entity that adds the session intermediate node to the session path is:

The proxy call session control function entity, or the service call session control function entity, or the application server.

The method according to claim 1, wherein the step of receiving, by the session intermediate node, the data information transmitted in the session is:

The session intermediate node establishes a session channel;

Data information passed by the session participant in the session reaches the session intermediate node through the session channel;

The session intermediate node receives and forwards data information transmitted in the session channel.

10. A method of establishing a session, the method comprising the steps of:

The network receives a session initiation protocol SIP message that is sent by the session participant and carries the session description protocol SDP to provide information, and the SIP message is used to establish a second session;

The session intermediate node receives and forwards data packets delivered in the session.

The method according to claim 10, wherein, after the network receives the SIP message, the proxy call session control function entity and/or the service call session control function entity add the intermediate node to The steps in the ^^ path include:

The proxy call session control function entity, and/or the service call session control function entity adds the address information of the session intermediate node to the SDP offer information, and/or the SDP answer message.

The method according to claim 11, wherein the step of receiving, by the session intermediate node, the data packet delivered in the session comprises:

The session intermediate node establishes a session channel;

The data information passed by the session participant in the session reaches the session middle section through the session channel 'Take up.

13. A system for establishing a session, comprising: a message conversation entity and a session intermediate node,

a session intermediate node adding unit, configured to add the session intermediate node to the session path, where the session intermediate node is configured to receive, and/or forward data information delivered in the session.

The system according to claim 13, wherein the intermediate node adding unit comprises:

An address information obtaining subunit, configured to acquire address information of the session intermediate node by using a network configuration, or interact with the session intermediate node to obtain address information of the session intermediate node; and add a subunit for using the The address information of the session intermediate node is added to the SDP providing information, and/or the SDP response information.

The system according to claim 13 or 14, wherein the message conversation entity is: a proxy call session control function entity, or a service call session control function entity, or an application server.

16. A system for establishing a session, comprising: a message conversation entity and a session intermediate node,

The message dialogue entity is configured to receive a session initiation protocol SIP message that is sent by the session participant in the first session and that carries the session description protocol SDP, and sends the SDP providing information or the SDP response message to the session intermediate node. SIP message;

a receiving unit, configured to receive a SIP message sent by the message conversation entity and data information delivered in the session; An address adding unit, configured to add address information of the session intermediate node to the session path, and a forwarding unit, configured to forward data information delivered in the session.

The system according to claim 16, wherein the message conversation entity is: a proxy call session control function entity, or a service call session control function entity, or an application server.

18. A network device, configured to add address information of a session intermediate node in a message session to a session path, and the method includes:

The session intermediate node adds a unit for adding the intermediate node of the tongue to the tongue path.

The network device according to claim 18, wherein the session intermediate node adds a power p unit, including:

An address information obtaining subunit, configured to acquire address information of the session intermediate node by using a network configuration, or interact with the session intermediate node to obtain address information of the session intermediate node; and add a subunit, where The address information of the session intermediate node is added to the SDP providing information, and/or the SDP answer message.