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Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)

"Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com> Wed, 23 March 2016 14:53 UTC

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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
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Date: Wed, 23 Mar 2016 14:52:20 +0000
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Subject: Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
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> -----Original Message-----
> From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Paul Kyzivat
> Sent: Wednesday, March 23, 2016 7:43 PM
> To: straw@ietf.org
> Subject: Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-
> srtp-09: (with DISCUSS and COMMENT)
> 
> On 3/23/16 4:15 AM, Tirumaleswar Reddy (tireddy) wrote:
> 
> >>    My preference is the language that Ram and Alissa came up with
> >> (aspirational or otherwise.) Aspirational or not, I think we should
> >> make it clear that the IETF does not recommend SBC media latching and
> >> prefers TURN.
> >
> > Got it, but TURN has to be used with ICE.
> 
> Why? It *can* be used with ICE, but it can also work without ICE. If you have
> reason to believe that TURN will be needed then you might not bother with
> ICE.

Yes, TURN can be used without ICE. But in the context of Security considerations discussed in https://tools.ietf.org/html/rfc7362#section-5, ICE is required to prove the identity of the peer before data is sent (though DTLS can also be used be used to prove the identity).

-Tiru
> 
> 	Thanks,
> 	Paul
> 
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