METHOD, CONTROL APPARATUS AND SYSTEM FOR LOCAL EXCHANGE

摘要

The present invention provides a method, a control apparatus and a system for local switch. The method includes: detecting whether adaptive multi-rate codec (AMR) speech versions used by devices that need to perform local switch are the same and whether rate sets of the AMR speech versions have an intersection; when the AMR speech versions are different, modifying the AMR speech versions so that the AMR speech versions are the same; when the rate sets of the AMR speech versions do not have the intersection, modifying the rate sets of the AMR speech versions so that the rate sets of the AMR speech versions have the intersection; and establishing the local switch between the devices that have the same AMR speech version and the intersection of the rate sets. In the present invention, functions of an AMR may be fully utilized while a Mobile Station (MS) performs the local switch by using the AMR speech version, so as to improve speech quality.