RFC 1890 (rfc1890) - Page 2 of 18

RTP Profile for Audio and Video Conferences with Minimal Control

RFC 1890                       AV Profile                   January 1996


   Use of this profile occurs by use of the appropriate applications;
   there is no explicit indication by port number, protocol identifier
   or the like.

   Other profiles may make different choices for the items specified
   here.

2.  RTP and RTCP Packet Forms and Protocol Behavior

   The section "RTP Profiles and Payload Format Specification"
   enumerates a number of items that can be specified or modified in a
   profile. This section addresses these items. Generally, this profile
   follows the default and/or recommended aspects of the RTP
   specification.

   RTP data header: The standard format of the fixed RTP data header is
        used (one marker bit).

   Payload types: Static payload types are defined in Section 6.

   RTP data header additions: No additional fixed fields are appended to
        the RTP data header.

   RTP data header extensions: No RTP header extensions are defined, but
        applications operating under this profile may use such
        extensions. Thus, applications should not assume that the RTP
        header X bit is always zero and should be prepared to ignore the
        header extension. If a header extension is defined in the
        future, that definition must specify the contents of the first
        16 bits in such a way that multiple different extensions can be
        identified.

   RTCP packet types: No additional RTCP packet types are defined by
        this profile specification.

   RTCP report interval: The suggested constants are to be used for the
        RTCP report interval calculation.

   SR/RR extension: No extension section is defined for the RTCP SR or
        RR packet.

   SDES use: Applications may use any of the SDES items described.
        While CNAME information is sent every reporting interval, other
        items should be sent only every fifth reporting interval.

   Security: The RTP default security services are also the default
        under this profile.




Schulzrinne                 Standards Track