| 摘要 |
PROBLEM TO BE SOLVED: To make it possible for a reception side communication apparatus to judge/recognize a DTMF signal without error, even if the DTMF signal is transmitted by means of a communication apparatus performing a voice code compression. SOLUTION: A communication apparatus 1 or 2 connected to a PBX 4 or 5 and an ATM network 3 includes: a DTMF signal detecting portion for detecting whether or not a DTMF signal is contained in a voice signal from the PBX; a DTMF signal monitoring portion; a DTMF cell generating portion for coding and sending out a DTMF signal; a DTMF cell decomposing portion for decoding a coded DTMF signal; and a DTMF signal generating portion for generating a DTMF signal on the basis of the information content of a decoded DTMF signal and for sending out this DTMF signal to the PBX, wherein the transmission side communication apparatus decodes the coded DTMF signal in a specified form and transmits the DTMF signal, and the reception side communication apparatus decodes the coded DTMF signal, adds a silent signal before or after sending out the decoded DTMF signal, and sends out the silent signal and the DTMF signal to the PBX 4 or 5. COPYRIGHT: (C)2008,JPO&INPIT
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