Method for establishing conversation

Abstract

The present invention discloses a method for establishing a session, which comprises that a session participation side sends a session initial protocol SIP message carrying a session description protocol SDP provided information to the network in the first session; session intermediate nodes are added in a session path after the network receives the SIP message; the session intermediate nodes receive, and / or forward the data messages transmitted in a session. Or the session participation side sends the session initial protocol SIP message carrying a session description protocol SDP provided information to the network, and the SIP message establishes a second session; the session intermediate nodes are added in a session path by a proxy call session control function entity and / or a serve call session control function entity after network receives the SIP message; the session intermediate nodes receive, and / or forward the data packets transmitted in the session. The session intermediate nodes can be effectively inserted in a session path, and the application requirement of the session can be met by utilizing the present invention.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for establishing a session. Background technique [0002] SIP (Session Initiation Protocol) is an application layer protocol for establishing, modifying and terminating multimedia sessions in IP networks. Its applications include voice, video, games, messaging, call control and online business fields. Before establishing a session, SIP first establishes a dialogue, which is an end-to-end connection that lasts for a certain period of time. During the establishment of the dialogue, the transmission path of the dialogue message will be determined. Once a dialog is established, subsequent SIP messages must be delivered along the message path of the dialog. [0003] SDP (Session Description Protocol) provides information to provide information such as various communication types, communication methods, communication method parameters, and communication addresse...

AI Technical Summary

Problems solved by technology

[0013] However, this method of adding a message session in a non-message session process has the following disadvantages: the network cannot associate the new message session request with the original session, and the network will re-allocate the route, re-allocate session resources, and reallocate the new message session request. For billing, and when the network determines the terminal state, it will reject the new message session request if the original session has not been released, resulting in the inability to establish a message session

[0014] In addition, in the process of establishing a message session, if the SDP provision information is not carried in the call request message, but the SDP provision information is carried in the response message of the call request message, none of the above methods can transfer the response of the call request message carrying the SDP provision information. The message is triggered to the intermediate node of the message session, and the intermediate node of the message session cannot add its own address information to the message session path

[0015] In addition, since the session establishment process defined by 3GPP (Third Generation Partnership Project) stipulates that the message path of the dialog where the session is located cannot be modified after the session is established, after the non-message session is established, if the intermediate node of the message session is not in the dialog where the non-message session is located In the message path, the network cannot insert the intermediate node of the message session into the dialogue where the message session is not located to establish the message session

For non-message sessions, there is also the problem that the session intermediate node cannot be added to the session path. For example, after the session is established, it needs to be monitored. At this time, the device used for monitoring needs to be added to the subsequent established session as a session intermediate node. To obtain monitoring data

At this time, if the device used for monitoring is not in the message path of the dialogue where the session is located, the network cannot insert the monitoring device as an intermediate node of the session into the session path, making network monitoring fail

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