[rtcweb] A few questions on draft-ejzak-dispatch-webrtc-data-channel-sdpneg-00

[Christer Holmberg <[e-mail]>]

Hi,

A few questions on  draft-ejzak-dispatch-webrtc-data-channel-sdpneg:

Q1:

Instead of defining a new SDP webrtc-DataChannel attribute, would it be possible to define the parameters as extension parameters to the SDP sctpmap attribute (yes, I know the ABNF currently does not allow that)?

Example:

a=sctpmap:1000 webrtc-datachannel 1;stream=6;subprotocol="CLUE"

I am not saying this would be good or bad - at this point I just want to understand whether it would work.


Q2:

Would it be possible, for subprotocol values, use the same IANA registry/values as for the WebRTC Data Channel Protocol?


Q3:

It would be good to clarify, if only one data channel is requested (or, even required), that the stream value must be the same in the Offer and Answer.


Q4:

I have issues with the max_retr, max_time and unordered parameters.

First, they seem to specify SENDING capabilities, rather than RECEIVING capabilities.

Second, they seem to describe characteristics associated with the subprotocol, in which case they could be specified in the associated subprotocol specification.

Regards,

Christer