Re: [Sip] Ready for WGLC on SIPS draft? Any last thoughts ontransport=tls?

[Robert Sparks <rjsparks at nostrum.com>]

What's missing from this, Francois, is how the proxy knows to set up  
the RR with tls in the first place.
i.e. when it retargets how does it _know_ it's retargetting to  
something over tls vs tcp.
I disagree that implementation specific configuration is a good  
enough answer.
I'm happy with the answer "you set this information in DNS" when you  
have DNS.
What I'm not seeing is how you set this when you don't have DNS.

RjS

On Jun 4, 2007, at 1:46 PM, Francois Audet wrote:

> > -----Original Message-----
> > From: Bob Penfield [mailto:BPenfield at acmepacket.com]
> > Sent: Monday, June 04, 2007 11:10
> > To: Audet, Francois (SC100:3055); Robert Sparks; Dean Willis
> > Cc: SIP IETF
> > Subject: Re: [Sip] Ready for WGLC on SIPS draft? Any last
> > thoughts ontransport=tls?
> >
> > I have seen cases where transport=tls appears in the
> > Record-Route where one hop between proxies uses TLS. For example:
> >
> >   UAC--<TCP>-->Proxy1---<TLS>--->Proxy2--<TCP>--->Proxy3---<TCP>-- 
> > >UAS
> >
> > This is done using a SIP URI (not SIPS).
> >
> > I have not been able to keep up with this discussion, but the
> > question I have is: without transport=tls, how would you
> > express the desire/need to do TLS for a SIP URI in a
> > Record-Route or Route header? I am talking about a case where
> > the proxy (Proxy2 above) supports TCP and TLS, but the
> > selection of transport is made for the initial INVITE, and
> > that same transport needs to be used for in-dialog requests?
>
> I'd say you use no transport parameter in the Record-Route and you
> do what 3261 recommends, which is to reuse the same TCP connection
> (TLS on this case) for in-dialog requests.
>
> Also, I'd like to point out that since Record-Route is by definition
> hop by hop, in that case sips would mean exactly the same as
> transport=tls.



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