Transmission device control system equipped with high-efficiency coding scheme in communication network

摘要

A control system for transmission devices equipped with a high-efficiency coding scheme in a communication network which avoids degradation of the quality of an acoustic signal for transmission and permits an efficient transfer of the acoustic signal. The control system has a structure in which: information on a high-efficiency coding scheme used in the preceding transmission device is sent to the current exchange from the preceding one through the use of an out-band signaling system for transmitting and receiving a call control signal via a channel different from a speech channel; and based on the information sent to the current exchange, second-placed transmission devices connected to the current and following exchanges avoid effectively decoding/coding of the acoustic signal transferred thereto, or the use of these transmission devices is avoided.