2.2.2 RTCP Compound Packets

Real-time Transport Control Protocol (RTCP) compound packets are a concatenation of simple RTCP packets, as specified in [RFC3550]. However, RTCP Source Description (SDES), RTCP Goodbye (BYE) ([RFC3550] section 6.6), RTCP Sender Report (SR), and RTCP Receiver Report (RR) ([RFC3550] section 6.4.2) MAY also be sent as simple packets (that is, only one RTCP packet, instead of a concatenation of two or more). Accordingly, this extension modifies the RTCP validation algorithm in [RFC3550] section A.2; it MUST accept simple RTCP SDES, RTCP BYE, RTCP SR, and RTCP RR packets. RTCP compound packets MAY carry one or more of the RTCP profile-specific extensions (section 2.2.7).