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RTP audio video profile
Real-time audio and video conferencing and communication applications that use the Real-time Transport Protocol (RTP) employ Session Description Protocol (SDP) to describe the media streams carried in a multi-media session. This description format specifies the technical parameters of the media streams. Such a set of RTP parameters of the media stream and its compression or encoding methods is known as a media ''profile'', or RTP audio video profile (RTP/AVP). Each profile is identified by a standardized payload type identifier.〔RFC 3551, ''RTP Profile for Audio and Video Conferences with Minimal Control'', H. Schulzrinne, S. Casner, The Internet Society (July 2003).〕
==RTP/AVP audio and video payload types==
RFC 3551 lists details of the payload format, or a reference for the details is provided. Payload identifiers 96–127 are used for payloads defined dynamically during a session. The document recommends dynamically assigned port numbers, although port numbers 5004 and 5005 have been registered for use of the profile when a dynamically assigned port is not required. The standard also describes the process of registering new payload types with IANA.
Applications operating under this profile should always support PCMU (payload type 0). Previously, DVI4 (payload type 5) was also recommended, but this recommendation was removed in August 2013 by RFC 7007 because "many RTP deployments do not support DVI4, and there is little reason to use it when much more modern codecs are available."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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