1. Introduction ........................................ 3
2. RTP Use Scenarios ................................... 5
2.1 Simple Multicast Audio Conference ................... 5
2.2 Audio and Video Conference .......................... 6
2.3 Mixers and Translators .............................. 6
3. Definitions ......................................... 7
4. Byte Order, Alignment, and Time Format .............. 9
5. RTP Data Transfer Protocol .......................... 10
5.1 RTP Fixed Header Fields ............................. 10
5.2 Multiplexing RTP Sessions ........................... 13
Schulzrinne, et al Standards Track [Page 1]
RFC 1889 RTP January 1996
5.3 Profile-Specific Modifications to the RTP Header..... 14
5.3.1 RTP Header Extension ................................ 14
6. RTP Control Protocol -- RTCP ........................ 15
6.1 RTCP Packet Format .................................. 17
6.2 RTCP Transmission Interval .......................... 19
6.2.1 Maintaining the number of session members ........... 21
6.2.2 Allocation of source description bandwidth .......... 21
6.3 Sender and Receiver Reports ......................... 22
6.3.1 SR: Sender report RTCP packet ....................... 23
6.3.2 RR: Receiver report RTCP packet ..................... 28
6.3.3 Extending the sender and receiver reports ........... 29
6.3.4 Analyzing sender and receiver reports ............... 29
6.4 SDES: Source description RTCP packet ................ 31
6.4.1 CNAME: Canonical end-point identifier SDES item ..... 32
6.4.2 NAME: User name SDES item ........................... 34
6.4.3 EMAIL: Electronic mail address SDES item ............ 34
6.4.4 PHONE: Phone number SDES item ....................... 34
6.4.5 LOC: Geographic user location SDES item ............. 35
6.4.6 TOOL: Application or tool name SDES item ............ 35
6.4.7 NOTE: Notice/status SDES item ....................... 35
6.4.8 PRIV: Private extensions SDES item .................. 36
6.5 BYE: Goodbye RTCP packet ............................ 37
6.6 APP: Application-defined RTCP packet ................ 38
7. RTP Translators and Mixers .......................... 39
7.1
