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Method for call state for supporting early-session

A non-active, application server technology, applied in the field of communication, can solve the problems of long negotiation time, interruption, and inability to play at the calling end, reducing the possibility of switching media ports and avoiding the effect of oscillation

Inactive Publication Date: 2011-05-25
徐州铁手五金工具制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a method for supporting early conversations in the talking state, which is used to overcome the problems in the prior art that the ringback tone cannot be played for the calling end when the call is transferred, the negotiation time is too long or the media is interrupted.

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  • Method for call state for supporting early-session
  • Method for call state for supporting early-session
  • Method for call state for supporting early-session

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] In the SIP / SDP communication system that uses Early-Session to play the ringback tone, if the calling terminal has entered the talking state and is transferred to the called terminal, in the prior art, the method of constructing a virtual SDP is used to make the calling terminal The terminal listens to the called Early-Session playback, which makes the transfer speed slow and the user experience is poor. Therefore, the present invention provides a transfer method that is compatible with Early-Session playback on the called side and satisfies Session media negotiation and resource reservation during call establishment.

[0037] In order to achieve the above purpose, the AS on the calling side needs to be compatible with the Early-Session SDP on the called si...

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Abstract

The invention discloses a method for call state supporting an early-session. In the method, called side early-session playback is compatible, and the method also satisfies session media negotiation and resource reservation during the process of establishing a call. In the method, during the media negotiation, SDPs of early-session and session are integrated as a composite SDP to be sent to a callstate calling terminal; the call state calling terminal finishes the work of media negotiation, link establishment, resource reservation and the like before a called party ringing; after the called party ringing, the early-session is used as calling playback; and after the called party picks up a telephone, the session is activated to carry out session negotiation, and the call stars after the negotiation.

Description

technical field [0001] The present invention relates to the technical field of communications, and in particular to a communication system in which sessions are established between SIP (Session Initiation Protocol) and SDP (Session Description Protocol), and supports early sessions when a user terminal is in a talking state. method. Background technique [0002] Early session, or "Early-Session", refers to a session that is established using early media before the call process of SIP communication is deployed before the establishment of a formal session (Regular Session, generally referred to as Session). The typical application scenario is that the application server (AS) -Session plays ring back tone and color ring tone to the calling UE (user terminal). Early-Session can better solve the problem of AS inserting early media (Early Media) for playback during the call establishment process, and can realize simultaneous negotiation of early media and regular session (Regular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/16H04W28/26H04W76/02H04W80/10
Inventor 胡毅高扬
Owner 徐州铁手五金工具制造有限公司