Device for communicating a doorside intercom set with a remote t

Details Device for communicating a doorside intercom set with a remote t Device for communicating a doorside intercom set with a remote t

1989-04-14

1990-07-24

Schreyer, Stafford D.

Telephonic communications

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

With intercom system

379355, 379103, H04M 126, H04M 1102

Patent

active

049439979

ABSTRACT:
A device is disclosed for communicating a doorside intercom set of an intercom system with a selected forwarding telephone, having a microprocessor and an input for inputting the telephone number of the selected remote telephone. To detect the state of the selected remote telephone, a back-ring/busy tone detector is provided. To enable a host to remotely change the number of the selected remote telephone, a multiple frequency signal decoder and a ring detector is provided.

REFERENCES:
patent: 4764953 (1988-08-01), Chern

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