| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system, that can simply and inexpensively communicate data such as facsimile communication at a low cost with high compatibility, through the easy operation during a three-party speech. SOLUTION: A control station 103 uses 2B channels of a public network 102 (ISDN) to be connected to two stations of opposite terminals (100, 101 and 108) so as to make a three-party speech among handsets or wireless phones 104. When detecting a facsimile original during the three-party speech, a channel being connected is selected, and facsimile transmission is applied to a corresponding opposite station or the channel is interrupted, when a new telephone number is received to make facsimile transmission to the opposite station of the entered telephone number. Furthermore, when detecting a facsimile modem signal during the three-party speech, or a manual line selection is operated on the basis of the line indication, facsimile reception is made from the channel detecting the modem signal or from the selected channel.
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