This is a specification of the Real-Time Transport Protocol (RTP/RTCP): H.261 and H.263 Video Streams Extensions (H26XPF).
H26XPF is an extension to the RTP payload format for H.261 video streams [RFC2032] and the RTP payload format for H.263 video streams [RFC2190]. It is used to transmit and receive H.261 or H.263 video streams in a two-party peer-to-peer call.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.