Key telephone system intercom arrangement

Details Key telephone system intercom arrangement Key telephone system intercom arrangement

1975-11-12

1976-08-24

Claffy, Kathleen H.

179 1HF, 179 81B, H04M 160

Patent

active

039768473

ABSTRACT:
A key telephone system is disclosed in which intercom calls may be answered "hands-free" at the called station. Intercom calls are originated in the standard manner, with the subscriber picking up the handset at the calling station and dialing the number of the called station. A voice communication path is established through the station selector to the telephone set represented by the dialed number. DC bias on this communication path through the station selector activates a loudspeaker and microphone arrangement in the called telephone set. The called party may thus converse "hands-free" with the calling party by utilizing the activated loudspeaker and microphone of the station set, and need not manipulate the station set for the duration of the conversation.

REFERENCES:
patent: 3743791 (1973-07-01), Duff et al.
patent: 3787640 (1974-01-01), Bush et al.
patent: 3872262 (1975-03-01), Kerman
patent: 3898392 (1975-08-01), Jackson
patent: 3904834 (1975-09-01), Shinoi et al.

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