4.1 SSRC Change Throttling

The following diagram represents a flow of messages from the sender to the receiver using SSRC change throttling.

Figure 5: Synchronization source change throttling

At the first SSRC change, from SSRC=1 to SSRC=2, throttling mode is enabled. Then a packet with a third SSRC, SSRC=3, is received, which causes the receiver to drop the packet and to restart the throttling mode timer. A packet with the ResyncSSRC is received, causing it to be the new valid SSRC for the session. Then a packet with the first SSRC, SSRC=1, is received, but because the receiver has already switched to SSRC=2, this packet's SSRC is unknown, which causes the receiver to drop the packet again, and to restart the throttling mode timer.