Importance

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Abstract

A visual communication is performed between a calling party and a called party through a plurality of channels. After the parties are connected through a first channel, an available telephone number of a second channel stored in a BAS control portion is read to a TNI control portion on each of the parties, and the TNI control portions of the parties exchange the available telephone numbers. Thereafter, when an incoming call having a telephone number is received through the second channel by a call control processing portion of the called party, the telephone number of the call is compared with the available telephone number of the second channel by an ICJ portion. To perform correct visual communication between parties, in cases where the telephone number of the call agrees with the available telephone number, the call is established by the call control processing portion, and image and audio signals are transmitted from the calling party to the called party through codec portions, multiplexing/demultiplexing portions and the first and second channels to perform a visual communication. In contrast, in cases where the telephone number of the call does not agree with the available telephone number, the second channel is released.

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First Claim