Video telephony call connection

摘要

1. A multi-channel Narrowband Integrated Services Digital Network (N-ISDN) based video-telephony, video-conferencing or multimedia call from a first Digital Termination Equipment (DTE) to a second DTE may be initiated by: making a call via an initial channel from the first DTE to the second DTE using the procedures of ISO/IEC 13871 (ISO-Agg); the first DTE obtaining from the second DTE information regarding channel number identification of additional second DTE channels and capability of support for the procedures of ITU-T recommendation H.221 (ITU-Agg) by the second DTE; and reverting to a multi-channel multiplexing technique described in ITU-Agg and aggregating the initial channel with the additional channels to make the multi-channel connection. <IMAGE>