System for securing access to equipment connectable to a telephone communication channel
First Claim
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1. A system for securing access to equipment connectable to a telephone communication channel, comprising:
- a first sensing means for sensing ringing current on a first access telephone communication channel,a controlling means for controlling ringing current on a secure telephone communication channel such that the equipment connectable to the secure telephone communication channel does not answer when ringing current is present on the secure telephone communication channel,means for disabling the controlling means in direct response to the first sensing means when ringing current is sensed on the first access telephone communication channel, anda first maintaining means for maintaining the disabled state of the controlling means for a pre-set time period after ringing current is first sensed on the first access telephone communication channel.
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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.
27 Citations
14 Claims
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1. A system for securing access to equipment connectable to a telephone communication channel, comprising:
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a first sensing means for sensing ringing current on a first access telephone communication channel, a controlling means for controlling ringing current on a secure telephone communication channel such that the equipment connectable to the secure telephone communication channel does not answer when ringing current is present on the secure telephone communication channel, means for disabling the controlling means in direct response to the first sensing means when ringing current is sensed on the first access telephone communication channel, and a first maintaining means for maintaining the disabled state of the controlling means for a pre-set time period after ringing current is first sensed on the first access telephone communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for securing access to equipment connectable to a telephone communication channel comprising the steps of:
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monitoring the presence of ringing current on an access telephone communication channel and a secure telephone communication channel, preventing the equipment connectable to the secure telephone communication channel from answering when ringing current is present on the secure telephone communication channel if ringing current is not sensed on the access telephone communication channel, disabling the prevention of the equipment from answering when ringing current is present on the secure telephone communication channel if ringing current is sensed on the access telephone communication channel, maintaining the disablement for a pre-set time period after ringing current is first sensed on the access telephone communication channel, and enabling after said pre-set time period the prevention of the equipment from answering when ringing current is present on the secure telephone communication channel.
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Specification