1. ITU-T Rec. H.323, Visual telephone systems and terminal equipment for local area networks which provide a non-guaranteed quality of service, 1996
2. ITU-T Rec. H. 261, Video CODEC for audiovisual services at p x 64 kbit/s, 1993
3. ITU-T Rec. H 263, Video CODEC for narrow telecommunications channels at <64 kbit/s, 1995
4. ITU-T Rec. H 320, Narrowband ISDN visual telephone systems and terminal equipment, 1995
5. ITU-T Rec. T.120 Data protocols for multimedia conferencing, 1996