The SSRC identifier is a randomly chosen value meant to be globally unique within a particular RTP session (see Section 8). A synchronization source may change its data format, e.g., audio encoding, over time. Examples of synchronization sources include the sender of a stream of packets derived from a signal source such as a microphone or a camera, or an RTP mixer (see below). All packets from a synchronization source form part of the same timing and sequence number space, so a receiver groups packets by synchronization source for playback. Synchronization source (SSRC): 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.
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