RTCRtpStreamStats: transportId property
  The RTCRtpStreamStats dictionary's
  transportId property is a string which uniquely
  identifies the object from which the statistics contained in the
  RTCTransportStats properties in the
  RTCStatsReport.
Value
  A string uniquely identifying the source of the statistics contained
  the RTCTransportStats properties in the RTCStatsReport.
Specifications
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No specification data found for api.RTCRtpStreamStats.transportId.
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