The RTCRtpSynchronizationSource dictionary of the WebRTC API is used by getSynchronizationSources() to describe a particular synchronization source (SSRC).

A synchronization source is a single source that shares timing and sequence number space. Since RTCRtpSynchronizationSource implements RTCRtpContributingSource, its properties are also available.

The information provided is based on the last ten seconds of media received.

Note: While the published specification describes this as an interface, it has since been changed to a dictionary in follow-up drafts.


Also implements the properties of RTCRtpContributingSource.

voiceActivityFlag Optional

A Boolean value indicating whether or not voice activity is included in the last RTP packet played from the source. If the peer has indicated that it's not supporting voice activity detection, this field is not provided.


WebRTC 1.0: Real-Time Communication Between Browsers (WebRTC 1.0)
# dom-rtcrtpsynchronizationsource

Browser compatibility

BCD tables only load in the browser