On Thu, Oct 23, 2003 at 08:53:26PM -0500, Martin Renschler (CA/EWU) wrote: > RTCP supports stacked messages, called compound RTCP. The first > message is an RR message, but others, like SDES will then follow. > Ethereal stops displaying after the first RR message (which is usually > a dummy with no reports) and shows the beginning of the next RTCP > message as "Sender SSRC".
Are you saying that the sender SSRC isn't always present in an RR packet? Where does it say that's valid (except perhaps by implication, with a length of 0 meaning that the SSRC isn't present, as that means the packet is 1)? RFC 1889 seems to suggest that the sender SSRC would be part of the fixed header; it doesn't say what an empty RR is other than one that has a count of 0 (meaning no report blocks).
