scope:

This Recommendation defines a system for real-time video/audio transmission over an IP-based network. Three profiles are defined, for video telephony, SDTV video transmission, and HDTV video transmission. The protocol of the system consists of session control and media transmission. Session control is based on the session initiation protocol (SIP), and for the use of SIP this Recommendation refers to [ITU-T J.366.4]. Several types of packet formats are defined for media transmission. With regard to codecs, this Recommendation provides some mandatory codecs and some optional ones for each profile. The system equipped with the protocol specified here can be used for bidirectional applications such as video-enabled order wire as well as unidirectional applications such as electronic news gathering.