Patent ID: 8280023

Claim:
A communication conference system comprising: a telephone line connector connectable to a telephone line, the telephone line connector having a receiver terminal; and a signal level converting adaptor including: an input/output terminal, which inputs/outputs a voice signal into/from the telephone line connector, connectable to the receiver terminal of the telephone line connector; a signal level converting circuit that converts the level of the voice signal outputting from the input/output terminal to have a voice signal level adapted to the telephone line connector, and converts the level of the voice signal input to the input/output terminal to a voice signal level adapted to an audio equipment; an external voice output terminal that outputs the voice signal input to the input/output terminal via the signal level converting circuit; and an external voice input terminal that inputs the voice signal and supplies to the input/output terminal via the signal level converting circuit; and a talk session device including: a network interface connectable to a network to transmit/receive voice information to/from a communication destination equipment via the network; a voice input terminal that inputs the voice signal output from the external voice output terminal; a voice output terminal that outputs the voice signal to the external voice input terminal; a speaker that emits a voice from the input voice signal; a microphone that picks up the voice to output the voice signal; and a processing portion that: supplies voice information input to the network interface as the voice signal to the speaker and to the input/output terminal via the signal level converting circuit, supplies the voice signal picked up by the microphone to the input/output terminal via the signal level converting circuit and to the network interface as voice information, and supplies the voice signal input to the input/output terminal via the signal level converting circuit to the speaker and to the network interface as voice information.