Key telephone system with circuitry for adding a third caller to

Details Key telephone system with circuitry for adding a third caller to Key telephone system with circuitry for adding a third caller to

1990-11-16

1992-07-07

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

370 62, H04M 320, H04M 356

Patent

active

051289890

ABSTRACT:
A key telephone system having an off-hook announcing function comprises a main unit and a plurality of standard key telephone sets each connected to the main unit. In the system, the main unit includes a plurality of digital telephone interface circuits connected to the key telephone sets and also a voice addition circuit. When one telephone set issues an off-hook announcement to another telephone set, the voice addition circuit adds together the voice signals received from the telephone sets and transmits the resultant added voice signal to yet another telephone set to provide to that telephone set an off-hook announcement.

REFERENCES:
patent: 4802206 (1989-01-01), Yoshida et al.

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