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IP multimedia sub system and its coding and decoding switching control method

A conversion control and media conversion technology, applied in transmission systems, electrical components, wireless network protocols, etc., can solve the problems of insufficient flexibility, inability to dynamically know the codec type of the called user, and high maintenance costs

Inactive Publication Date: 2007-10-10
HUAWEI TECH CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] At present, the 3GPP 23218.740 protocol provides a solution for implementing codec conversion between the calling party and the called party. It mainly configures the codec AS in the data based on the initial filter criterion (IFC) in the S-CSCF to control the codec conversion. The codec conversion between the calling party and the called party is realized through the media resource function controller (MRFC), but since the codec type supported by the called user cannot be dynamically known, all users need to configure the relevant codec AS in the IFC For codec conversion, the flexibility is not enough, the maintenance cost is high, and the connection time is long

Method used

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  • IP multimedia sub system and its coding and decoding switching control method
  • IP multimedia sub system and its coding and decoding switching control method
  • IP multimedia sub system and its coding and decoding switching control method

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Embodiment Construction

[0071] With reference to Fig. 1, this figure is the main flowchart of a specific embodiment of the codec conversion control method of the present invention, specifically mainly comprises the following steps:

[0072] Step s101: Predict the type of codec supported by the called user. In actual implementation, the S-CSCF may predict the type of codec supported by the called user when the session is established. For example, when the S-CSCF receives the session establishment initiation After the Invite message, the codec type supported by the called user can be obtained in the following ways:

[0073] (1) Based on the number analysis results of the Request URI, determine the network type of the called user, and then determine the codec type supported by the called user terminal. The media attribute table is implemented, and the codec type supported by the network where the called user is located can be obtained by querying the local configuration.

[0074] (2) The S-CSCF saves t...

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Abstract

The method comprises: pre-estimating the encode and decode type supported by the called user; according to the encode and decode type supported by the called user and the encode and decode type supported by the calling user, deciding if the session needs to be made with a encode and decode conversion; if there is an intersection between the said two encode and decode types, then continuing the session process; if there is no intersection between them, then the encode and decode type will be converted; controlling and negotiating the encode and decode type respectively supported by the calling and called users, and informing the encode and decode type respectively supported by both calling and called users to the media gateway.

Description

technical field [0001] The present invention relates to the technical field of IP Multimedia Subsystem (IMS), and more specifically, the present invention relates to an IMS system and a codec conversion control method thereof. Background technique [0002] At present, in view of the trend of the integration of the Internet and the telecommunication network, the International Standardization Organization 3rd Generation Partnership Project (3GPP) has introduced the IP Multimedia Subsystem (IMS) of the all-IP service network architecture supporting multimedia services on the basis of the packet bearer network. The goal of IMS is to shield user access methods according to personalized user data, control the openness of service capabilities, and provide a new multimedia communication experience. [0003] The main functional entity in IMS includes call control entity (CSCF), and there are three types of CSCF: Serving CSCF (S-CSCF), Proxy CSCF (P-CSCF), and Inquiring CSCF (I-CSCF)....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/22H04L29/06H04L29/08H04W80/10
CPCH04L29/06217H04L29/06224H04L65/102H04L65/1016
Inventor 欧阳振华任慧鹏
Owner HUAWEI TECH CO LTD
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