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Re: [Sip] draft-ietf-sip-sips-03.txt: Closing of Opened issues

"Vijay K. Gurbani" <vkg@alcatel-lucent.com> Thu, 26 April 2007 21:48 UTC

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Date: Thu, 26 Apr 2007 16:48:18 -0500
From: "Vijay K. Gurbani" <vkg@alcatel-lucent.com>
Organization: Bell Labs Security Technology Research Group
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To: Francois Audet <audet@nortel.com>
Subject: Re: [Sip] draft-ietf-sip-sips-03.txt: Closing of Opened issues
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Francois Audet wrote:
> VIA already supports SCTP, TLS-SCTP. And the draft provides the 
> references to RFC 4168 that defines it.

We've had this conversation before.

That is all well and fine for Vias (responses), but what about
requests triggered by a R-URI?

> DTLS is defined in
> http://tools.ietf.org/wg/sip/draft-jennings-sip-dtls-03.txt.

dtls-03 says that a SIP URI to be sent over DTLS should
look like the following:

    sip:alice@example.com;transport=dtls-udp

Two questions:
   1/ should it not be "sips" scheme here?
   2/ If we are endorsing "transport=dtls-udp" in a SIP URI, then
      saying that you should not put "transport=tls" in a SIP URI
      seems silly. (Note that I personally do not like how
      implementations have continued to use "transport=tls"
      despite rfc3261 deprecating this.  But questions will arise
      in the future that why are we allowing "transport=dtls-udp"
      and not "transport=tls"?)

Thanks,

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
2701 Lucent Lane, Rm. 9F-546, Lisle, Illinois 60532 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
WWW:   http://www.alcatel-lucent.com/bell-labs


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