[rtcweb] Call for consensus on ICE transport parameter issue (February 15).

[Ted Hardie <[e-mail]>]

Over the the past few weeks, the working group has discussed whether to
adopt a change to JSEP which would adjust how the ICE proto line transport
parameters are populated in certain mid-session offers where the final
candidate is a TCP candidate.  Outside of the extensive working group
discussion on the mailing list, participants may also wish to review the
follow issue:

https://github.com/rtcweb-wg/jsep/issues/854

and the conversations related to these two pull requests:

https://github.com/rtcweb-wg/jsep/pull/862
and
https://github.com/rtcweb-wg/jsep/pull/863

The chairs believe that there is technical consensus that this proposed
change would not materially affect JSEP-only exchanges, since this
parameter is ignored in those.

The remaining technical issues are:

* whether making one of these changes would improve interoperability
between WebRTC and non-WebRTC clients which use SIP/SDP.

* whether the additional complexity in tracking the use of UDP vs. TCP and
populating the parameter accordingly is onerous or unwarranted for WebRTC
implementations.

After reviewing the discussion to date, the chairs believe that there is
rough consensus for the first point, though there is also broad agreement
that the benefit of this change is currently theoretical, since no existing
WebRTC browser implementation has relevant code.

On the second point, the chairs believe that there is no consensus yet
demonstrated.  Because we believe that this is in part because the actual
proposal has not been entirely clear, and the complexity is therefore
somewhat hard to gauge, the chairs wish to make a specific call for
consensus.

Does the working group approve the change in the following PR:

https://github.com/rtcweb-wg/jsep/pull/863 ?

Working group participants who have objections to the change are asked to
specify whether they believe it has a technical fault, whether they object
on the basis of its complexity, or whether they have other issues related
to the change they need to raise.

The chairs are already aware of the objection of Eric Rescorla on the basis
of complexity, and will factor it into the review.

Please send comments by February 15th, 2019.

regards,

Ted Hardie and Sean Turner