Additional telephone equipment and method for protecting against

Details Additional telephone equipment and method for protecting against Additional telephone equipment and method for protecting against

1989-08-01

1990-08-28

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

Fraud or improper use mitigating or indication

379352, 379199, H04M 166

Patent

active

049532014

ABSTRACT:
An additional piece of telephone equipment for protecting against nuisance calls as a substitute for a telephone answering device, wherein after the equipment is engaged upon reception of an incoming call, one or the other of a dummy busy tone or a dummy ringback tone is randomly sent out to a calling party, so that it is possible to inform the calling party in a natural way that a called party cannot answer the calling party now. At this time, according to an even or odd number of value of a counter in a microprocessor (CPU), the dummy busy tone or the dummy ringback tone is sent out, and for this purpose, a random-number command stored in the program is used to select the above even or odd number.

REFERENCES:
patent: 3033941 (1962-05-01), Bell et al.
patent: 4266098 (1981-05-01), Novak
patent: 4387272 (1983-06-01), Castro et al.

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