Re: [rtcweb] Proposal to break the ICE impasse

Nils Ohlmeier <nohlmeier@mozilla.com> Tue, 29 January 2019 17:46 UTC

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From: Nils Ohlmeier <nohlmeier@mozilla.com>
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Date: Tue, 29 Jan 2019 09:46:10 -0800
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To: Roman Shpount <roman@telurix.com>
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Subject: Re: [rtcweb] Proposal to break the ICE impasse
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What I don’t quite understand here: 1-4 with the initial connection will use UDP in the protocol field. Only the subsequent re-offer from step 5 on would use TCP in the protocol field. How come that 1-4 works, but 5 does not?

Best
  Nils Ohlmeier

> On 29Jan, 2019, at 05:36, Roman Shpount <roman@telurix.com> wrote:
> 
> 1-4 are for initial connection. 5 is for the new offer. It can be a "fix up" offer or simply an offer which happened not to change transport parameters and is simply adding a codec.
> 
> I can write this up in more detail if you need.
> 
> Roman Shpount
> 
> On Tue, Jan 29, 2019, 7:02 AM Iñaki Baz Castillo <ibc@aliax.net <mailto:ibc@aliax.net> wrote:
> Hi, Roman.
> 
> In SIP world (and in many others) 5 will happen before 3, so I don't understand. Do I miss something?
> 
> El mar., 29 ene. 2019 10:10, Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>> escribió:
> Iñaki,
> 
> Please consider the following:
> 
> 1. Browser client is placed behind the firewall which only allows TCP connections
> 
> 2. No TURN servers are configured
> 
> 3. Client establishes connection to a server which supports ICE TCP
> 
> 4. ICE nomination completes
> 
> 5. Client browser app calls createOffer with no options (ICE restart option is not present)
> 
> Based on the current set of specifications, in this case ICE nomination is complete and the TCP candidate is nominated. No other candidates should be present in the offer.
> 
> Roman Shpount
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