August 1999
Intermediate to advanced
328 pages
8h 50m
English
Content preview from Voice Over IPBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
H.245
I made a few comments about H.245 earlier. Its purpose is to specify the syntax of terminal information messages and the procedures to use those messages. It is a "generic" protocol in that it is used by H.222.0, H.223, and H.225.0.
H.245 provides some features that are similar to RTCP, such as the calculation of RTT between two terminals. However, the H Series recommendations provide no guidance on how to (or how not to) interwork H.245 and RTCP. The recommendations contain "informative" appendices describing RTCP but (unfortunately) not in relation to the H Series operations.
I have not shown any H.245 message flows in this chapter (just RAS and Q.931 messages have been shown). Notwithstanding, H.323 describes several scenarios for using ...