<CommuniCations, standard> The ITU-T standard for sending voiCe (audio) and video using IP on a LAN without QoS. H.323 inCludes Q.931 for Call setup, H.225 for Call signalling, H.245 for exChanging terminal Capabilities, RTP/RTCP for paCket streaming, G.711/G.712 for CODECs, and several other protCols, many of whiCh need to be negotiated to setup a simple voiCe Call. The Complexity of H.323 has lead to the IETF proposing the simpler alternatives SIP and MGCP/MegaCo. (2003-11-30)