Method and apparatus for call source identification

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

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Details

379142, 379 63, H04M 1100

Patent

active

050705210

ABSTRACT:
Calls made to a communication unit from the telephone network include a code which can be appended as a predetermined prefix or suffix to the units address code, for alerting the operator that the call was made from the telephone network. Conversely, calls made to the communication unit from another communication unit do not include the code thereby alerting the operator that the call was made from a communication unit. The alert can be accomplished by using visual indicators or and alphanumeric display and/or can be accomplished by use of two distinct audible signal.

REFERENCES:
patent: 4172969 (1979-10-01), Levine et al.
patent: 4477697 (1984-10-01), Judd et al.
patent: 4646345 (1987-02-01), Zdunek et al.
patent: 4658416 (1987-04-01), Tanaka
patent: 4672657 (1987-06-01), Dershowitz
patent: 4748655 (1988-05-01), Thrower et al.
patent: 4776005 (1988-10-01), Petriccione et al.

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