3.2.7 Other Local Events
This protocol has the following RTCP-related local event processing rules, in addition to those specified in [RFC3550] section 6.
Video packet loss detected: If the loss of a video packet is detected and the packet loss notification timer is expired, an RTCP packet pair SHOULD be sent just as if the RTCP send timer had expired, as specified in section 3.2.6, and MUST include a packet loss notification extension containing the lost packet's sequence number. The packet loss notification timer MUST be restarted. The details of how and when to flag that a video packet has been lost are up to the implementation.