Edge ORTC Receiver Reports seem to have an undocumented extension

By design Issue #12054804

Details

Author
Philip J.
Created
May 17, 2017
Privacy
This issue is public.
Found in
  • Microsoft Edge
Reports
Reported by 1 person

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Steps to reproduce

Attached is a capture of a decrypted RTCP Receiver Report packet sent from Edge. As you can see from the RTCP header, the length is marked as 0x0F. This means there should be 0x0F+1 = 0x10 total 32-bit words in the output) Also from the header, there is only 1 report block in this packet. So the Receiver Report should have a length field equal to 0x07. That leaves 0x10 more 32-bit words in the output that aren’t accounted for. Could you point me towards the extension that is being applied?

Also, extensions in Receiver Reports should only be present if the SDP indicates it as such. And I don’t see any such extension. Can you please add it to the SDP?

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