THE H.323 PROTOCOL STACK
H.323 consists of several standards, and cites the use of others, as shown in Figure 9-4. For audio applications, G.711 is required, and other G Series recommendations are options. However, the preference in recent commercial products is not G.711, because of its 64 kbit/s-bandwidth requirement.
Figure 9-4. H.323 protocol stack
The video standards are H.261 and H.263. Data support is through T.120, and the various control, signaling, and maintenance operations are provided by H.245, Q.931, and the Gatekeeper specification.
The audio and video packets must be encapsulated into the Real-Time Protocol (RTP) and carried ...
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