SSRC stands for Synchronization Source.

It is a 32 bit random value that is generated in RTP to denote a specific source used to send media in an RTP connection.

About WebRTC Glossary

The WebRTC Glossary is an ongoing project where users can learn more about WebRTC related terms. It is maintained by Tsahi Levent-Levi of BlogGeek.me.

Looking to learn more about WebRTC? 

Check my WebRTC training courses