Patent ID: 7415029

Claim:
A residential gateway to receive channel associated signals (CAS) from a PBX switch, the residential gateway comprising: a call control device to communicate with a call agent using gateway control protocol signals; a management module; and a CAS module coupled to the call control device, the management module, and the PBX switch, the CAS module to receive a table from the management module, the table including a plurality of entries, each of the plurality of entries including a first line signaling state, a second line signaling state, a first time duration, and an event, to receive the channel associated signals from the PBX switch, to recognize a change of line signaling state from a former state to a new state, to find a first entry in the table where the former state is the same as the first line signaling state and the new state is the same as the second line signaling state, to set a timer for the first time duration of the first entry, and to send an indication of the event of the first entry to the call agent through the call control device if the timer expires before the CAS module recognizes a further change of line signaling state.