H.323 is part of a family of ITU-T recommendations that specify multimedia communications services such as real-time audio, video, and data over a variety of communication services, including multipoint links where multiple users participate in the same exchange (such as a videoconference). The ITU calls H.323 a recommendation for a "visual telephone system" that works over LANs. It does not guarantee high quality of service due to the packet-based, but QoS can be obtained by relying on other means as discussed under "QoS (Quality of Service)."
- RTCP (Real-time Transport Control Protocol)
- H.225 RAS (Registration, Admission, Status)
- H.225 Call Signaling
- H.245 Control Signaling
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2008-08-14 11:24 
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