Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1993-11-29
1995-11-21
Hofsass, Jeffery A.
Telephonic communications
Call or terminal access alarm or control
At switching center
379194, 379200, H04M 170
Patent
active
054694990
ABSTRACT:
A system for accessing equipment connectable to a secured telephone communication channel by sensing ringing current on an access telephone communication channel. Ringing current on the secured channel is controlled such that the secured channel does not answer unless the access channel was called within a preset time period prior to calling the secured channel.
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Hofsass Jeffery A.
Wolinsky Scott
LandOfFree
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