RFC 3550 (rfc3550) - Page 2 of 104

RTP: A Transport Protocol for Real-Time Applications

Alternative Format: Original Text Document
< Previous
Next >
RFC 3550                          RTP                          July 2003


Table of Contents

   1.  Introduction ................................................   4
       1.1  Terminology ............................................   5
   2.  RTP Use Scenarios ...........................................   5
       2.1  Simple Multicast Audio Conference ......................   6
       2.2  Audio and Video Conference .............................   7
       2.3  Mixers and Translators .................................   7
       2.4  Layered Encodings ......................................   8
   3.  Definitions .................................................   8
   4.  Byte Order, Alignment, and Time Format ......................  12
   5.  RTP Data Transfer Protocol ..................................  13
       5.1  RTP Fixed Header Fields ................................  13
       5.2  Multiplexing RTP Sessions ..............................  16
       5.3  Profile-Specific Modifications to the RTP Header .......  18
            5.3.1  RTP Header Extension ............................  18
   6.  RTP Control Protocol -- RTCP ................................  19
       6.1  RTCP Packet Format .....................................  21
       6.2  RTCP Transmission Interval .............................  24
            6.2.1  Maintaining the Number of Session Members .......  28
       6.3  RTCP Packet Send and Receive Rules .....................  28
            6.3.1  Computing the RTCP Transmission Interval ........  29
            6.3.2  Initialization ..................................  30
            6.3.3  Receiving an RTP or Non-BYE RTCP Packet .........  31
            6.3.4  Receiving an RTCP BYE Packet ....................  31
            6.3.5  Timing Out an SSRC ..............................  32
            6.3.6  Expiration of Transmission Timer ................  32
            6.3.7  Transmitting a BYE Packet .......................  33
            6.3.8  Updating we_sent ................................  34
            6.3.9  Allocation of Source Description Bandwidth ......  34
       6.4  Sender and Receiver Reports ............................  35
            6.4.1  SR: Sender Report RTCP Packet ...................  36
            6.4.2  RR: Receiver Report RTCP Packet .................  42
            6.4.3  Extending the Sender and Receiver Reports .......  42
            6.4.4  Analyzing Sender and Receiver Reports ...........  43
       6.5  SDES: Source Description RTCP Packet ...................  45
            6.5.1  CNAME: Canonical End-Point Identifier SDES Item .  46
            6.5.2  NAME: User Name SDES Item .......................  48
            6.5.3  EMAIL: Electronic Mail Address SDES Item ........  48
            6.5.4  PHONE: Phone Number SDES Item ...................  49
            6.5.5  LOC: Geographic User Location SDES Item .........  49
            6.5.6  TOOL: Application or Tool Name SDES Item ........  49
            6.5.7  NOTE: Notice/Status SDES Item ...................  50
            6.5.8  PRIV: Private Extensions SDES Item ..............  50
       6.6  BYE: Goodbye RTCP Packet ...............................  51
       6.7  APP: Application-Defined RTCP Packet ...................  52
   7.  RTP Translators and Mixers ..................................  53
       7.1  General Description ....................................  53



Schulzrinne, et al.         Standards Track
< Previous
Next >