The ITU-T standardfor sending voice (audio) and video using IP on a LAN without QoS. H.323 includes Q.931for call setup, H.225for call signalling, H.245for exchanging terminal capabilities, RTP/RTCPfor packet streaming, G.711/G.712forCODECs, 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)