System for securing access to equipment connectable to a...

Details System for securing access to equipment connectable to a... System for securing access to equipment connectable to a...

H - Electricity

04

M

H04M 1/66 (2006.01) H04M 3/38 (2006.01) H04M 3/02 (2006.01)

Patent

CA 2136884

A system for securing access to equipment connectable to a telephone communication channel comprising means for sensing ringing current on an access telephone communica tion channel, means for controlling ringing current on a secure telephone communication channel such that the equipment connectable to the secure telephone communica- tion channel does not answer when ringing current is present on the secure telephone communication channel, means for enabling and disabling the operation of the means for controlling ringing current on the secure telephone communication channel in direct response to the means for sensing ringing current on the access telephone communication channel such that the means for controlling ringing current on the secure telephone communication channel is disabled when ringing current is sensed on the access telephone communication channel, and means for maintaining the disabled state of the means for control- ling ringing current on the secure telephone communication channel for a pre-set time period after ringing current is first sensed on the access telephone communication chan- nel.

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