H.323 is the international standard for multimedia communication over packet-switched networks, including LANs, WANs, and the Internet. It was first defined by the ITU in 1996 and has been updated regularly. The most recent version is H.323 version 5 (2003).
H.323 is an "umbrella" specification, which includes the standards H.323, H.225.0, H.245, the H.450-series documents, and the H.460-series.
The H323 Asn1API is compliant with :
uniGone provides Asn1API for H323 (H225, H235, H450) and T120.