Patent ID: 6700973
Filing Date: 2004-03-02
Classification: H04L,H04M,H04Q

Abstract:
A communication apparatus connected to a voice terminal apparatus and a communication channel, for mutual communication with an opposite-side communication apparatus, on an opposite side of communication, the opposite-side communication apparatus being connected to another voice terminal apparatus, said communication apparatus comprising:a terminal connecting means for connecting to said voice terminal apparatus, a voice code compressing means, which is connected to said terminal connecting means, for generating voice information by code-compressing a voice signal from said voice terminal apparatus and sending out the voice information to said opposite-side communication apparatus via said communication channel, a voice code expanding means for generating a voice signal by code-expanding compressed voice information received from said opposite-side communication apparatus via said communication channel and sending out the voice signal to said voice terminal apparatus, a detecting means, which is connected to said terminal connecting means, for detecting whether or not a DTMF signal is contained in a voice signal from said voice terminal apparatus, a DTMF coding means for, when said detecting means has detected a DTMF signal, generating DTMF information by coding said DTMF signal into a specified form and sending out the DTMF information to said communication channel, a DTMF decoding means for, when coded DTMF information has been received, from said opposite-side communication apparatus via said communication channel, decoding the coded DTMF information, and a DTMF generating means for generating a DTMF signal on the basis of the content decoded by said DTMF decoding means and sending out the DTMF signal to said voice terminal apparatus.