Method and apparatus for control of vocoder bypass utilizing inband signaling

(-- 57) summary -- out of band and a vocoder bypass is performed using the combination of signaling in a zone. In the suitable case of the operation of the present invention, in order to transmit within compression audio, two signaling channels are prepared. Each signaling channel communicates at a suitable rate, and enables positive detection at the high speed of the state which shows vocoder bypass operational mode, and performs synchronization and communication of compression audio in vocoder bypass operational mode.