Telephone extension switch hook state detection system

Details Telephone extension switch hook state detection system Telephone extension switch hook state detection system

H - Electricity

04

M

H04M 11/06 (2006.01) H04M 1/72 (2006.01) H04M 1/723 (2006.01) H04M 1/82 (2006.01) H04M 3/22 (2006.01)

Patent

CA 2253532

A computer integrated telephony system embodied in a PC that includes a telephony interface connected to the local loop that detects whether one or more extension phones are off-hook by using the signal generating and detection capabilities found on a typical telephony interface card. In the preferred embodiment, the telephony interface is based on a programmable DSP that generates and injects onto the local loop a subsonic signal having a known shape and amplitude. If one or more extensions are off-hook, the amplitude of the subsonic signal detected on the line will be significantly attenuated. The amplitude of the detected signal is compared against a threshold value and an indication is made if the detected signal amplitude is below the threshold value.

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