SSRC (Synchronization Source)

As specified in RFC 3550, SSRC (Synchronization Source) is the source of a stream of RTP packets, identified by a 32-bit numeric SSRC identifier carried in the RTP header so as not to be dependent upon the network address.

NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1

RFC 3550, RTP: A Transport Protocol for Real-Time Applications