Re: [rtcweb] I-D Action: draft-ietf-rtcweb-jsep-06.txt - SDP sctpmap attribute usage

Christer Holmberg <> Fri, 14 February 2014 14:26 UTC

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From: Christer Holmberg <>
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Thread-Topic: [rtcweb] I-D Action: draft-ietf-rtcweb-jsep-06.txt - SDP sctpmap attribute usage
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Date: Fri, 14 Feb 2014 14:26:42 +0000
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Subject: Re: [rtcweb] I-D Action: draft-ietf-rtcweb-jsep-06.txt - SDP sctpmap attribute usage
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Section 5.2.1 says:

	"Within the data m= section, the "a=mid", "a=ice-ufrag", "a=ice-
   	passwd", "a=ice-options", "a=candidate", "a=fingerprint", and
   	"a=setup" lines MUST be included as mentioned above, along with an
   	"a=sctpmap" line referencing the SCTP port number and specifying the
   	application protocol indicated in [I-D.ietf-rtcweb-data-protocol]."

The statement that the sctpmap attribute specifies the application protocol indicate in the DCP is not aligned with the sctp-sdp draft. The sctp-sdp draft specifies that the attribute specifies the application running on top of the SCTP association - which in this case is the WebRTC Data Channel. The protocol running on top of that data channel is then specified in the DCP.