H.225.0

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).

The Message Encoding is performed by utilizing Q.931 User-to-User information elements to convey H.225 messages. The messages themselves are encoded according to the Packed Encoding Rules (PER) of ASN.1.

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