SPEECH CODEC MODE ASSIGNMENT METHOD FOR VoIP(VOICE OVER IP) WITH AMR SPEECH CODEC

摘要

PURPOSE: A voice codec mode allocating method in an Internet phone system adopting a voice codec having a variable transmission rate is provided to reduce influence of flexible channel characteristics on a terminal by adaptively controlling a size of a packet transmitted from the terminal according to channel characteristics. CONSTITUTION: A callee terminal receives the ith packet from a caller terminal(602). A controller of the callee terminal calculates a Jiti value to estimate a state of a channel through the received packet(604). The controller of the callee terminal selects a voice codec mode corresponding to the calculated Jiti value(606). The controller of the callee terminal transmits a packet to the caller terminal by using the selected voice codec mode(608).