Patent ID: 6990125
Filing Date: 2006-01-24
Classification: H04Q

Abstract:
1. An ISDN terminal endpoint comprising: an ISDN network interface capable of supporting at least first and second B-channels and one D-channel; means for auto-generating a D-channel call setup request to initiate a first call, using the first B-channel, to a directory number associated with the ISDN terminal equipment; means for auto-answering the first call using the second B-channel; means for auto-generating a D-channel hold request for one of the B-channels connected to the first call; means for, if the hold is acknowledged, auto-generating a second D-channel call setup request using the B-channel of the hold request, and receiving an acknowledgment across the D-channel related to the second D-channel call setup request; and means for evaluating the acknowledgement to determine whether a call conferencing ISDN supplementary service is available.