is a video codec
designed by the ITU-T
as a low-bitrate encoding solution for videoconferencing. It was first designed to be utilized in H.323
based systems, but now is finding use in RTSP
) and SIP
(Internet conferencing) solutions as well.
H.263 was based on H.261, the previous ITU-T standard for video compression, and provides a suitable replacement for it at all bitrates. It has been superseded by H.263v2 (a.k.a. H.263+ or H.263 1998).
For more information on H.263, see the following sources: