Patent ID: 6671373
Filing Date: 2003-12-30
Classification: H04M

Abstract:
An apparatus comprisinga subscriber line interface circuit capable of interfacing with a transceiver over a connection; and a subscriber line audio-processing circuit coupled to the subscriber line interface circuit, the subscriber line audio-processing circuit including: a first logic adapted to receive a signal over the connection and to determine if a change in the signal is greater than a first preselected value and to determine if a value of the signal is greater than a second preselected value; and a second logic for adjusting the DC feed to the connection in response to determining that the change in the signal is greater than the first preselected value and that the value of the signal is greater than the second preselected value, wherein the subscriber line audio-processing circuit further includes logic for detecting switch-hook of the transceiver in response to adjusting the DC feed.