H.225.0
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H.225.0 is a sub-standard of H.323.
The main objective of H.225.0 is the definition of messages:
- Call Signaling: establish, control and end an H.323 call. The call signaling of H.225.0 is based on the call setup procedures for ISDN, Recommendation Q.931.
- RAS signaling function: perform registration, admission, bandwidth changes, status and dissengange procedures between endpoints and an H.323 Gatekeeper. The RAS signaling function uses a separate channel ( RAS channel). This set of messages is called Registration, Admission and Status ( RAS).