Telephone announcement system

Details Telephone announcement system Telephone announcement system

1988-01-27

1990-02-06

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379387, 379388, 379177, H04M 172

Patent

active

048993786

ABSTRACT:
A telephone announcement system adaptable to existing two-wire subscriber telephone lines is described. The announcement system is connected between the tip and ring wires of a standard subscriber telephone line and activated in a receive-only announcement mode. The announcement box monitors the telephone line for detecting specific DTMF tones to activate the device. Once activated, the device receives audio information on the telephone line, amplifies it, and broadcasts it on a speaker. The box is deactivated by the same or another DTMF tone. In operation, the subscriber may receive a telephone call, press a specific DTMF tone on the push-button telephone pad and then make the announcement of the telephone call into the handset of the telephone, and the telephone call is then broadcast by the announcement box.

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