Method, system and device for speech codec negotiation in communication system

摘要

The embodiments of the present invention disclose a method for speech Codec negotiation in a communication system in which a calling user (100) initiates the speech Codec negotiation with a called mobile station (200). The method includes: receiving by a mobile switching center emulation (300) in the communication system an originating call signal (1. Originating call) from a calling user, the originating call signal carrying a number of a called mobile station (200); obtaining (4. Answer) a latest speech Codec list used by the called mobile station from a database (400) storing mobile station information in accordance with the number of the called mobile station; determining a speech Codec to be used in a communication between the calling user and the called mobile station; and establishing a voice bearer in the speech Codec for the calling user and the called mobile station. The method avoids a bearer update process and improves switching speed. In addition, the embodiments of the present invention also disclose a system and a device for speech Codec negotiation in a communication system.