(i.e., where they do not understand the meaning of all values in the "a=rtcp-fb" line); o SHOULD provide feedback information as specified in this document using any of the RTCP feedback packets as specified in one of the "rtcp-fb" attributes for this media session; and o MUST ...
Tcp Interleaving support is finally completed meaning that QuickTime and other media players will also work right out of the box. There are still some things to do however the ground work (such as packet and report classes are already there) such as : Rtcp XR Framework - RFC2032, RFC3611,...