1. H. 323 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.
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