Hi,

> -----Original Message-----
> From: telepathy-
> [email protected]
> [mailto:telepathy-
> [email protected]] On Behalf Of
> ext Olivier CrĂȘte
> Sent: Thursday, October 14, 2010 6:50 PM
> To: [email protected]
> Subject: Re: [Telepathy] SIP Session without Account
> 
> On Thu, 2010-10-14 at 17:45 +0200, Esben Stien wrote:
> > Empathy won't let me start a conversation without any accounts.
> >
> > SIP does not require that you have an account on a server to be able
> to
> > dial it.
> 
> Telepathy-SofiaSIP doesn't support P2P SIP, it sends all messages
> through the SIP proxy. If you really want to do P2P SIP, your best bet
> is probably Ekiga right now. That said, I really haven't seen anyone
> use
> P2P SIP in real life.

... But if somebody does, I'd be happy to review a patch to telepathy-sofiasip.
The sofia-sip stack permits proxy-less operation. Some modifications are needed 
to support the p2p mode in telepathy-sofiasip. A good start is a parameter to 
make it omit the proxy parameter when constructing the NUA stack instance. The 
default IP socket binding is to INADDR_ANY on the default SIP port, so the 
stack should automatically become a usable UAS. It can resolve destinations for 
outbound requests too (one caveat here is that sofia-sip uses only DNS and 
ignores other host name lookup methods). There might be some issues with 
interpreting the request URI or the To URI as addressed to the local user; all 
incoming requests are currently handled as if addressed to our local user 
without checking.

Hope this helps,
  Mikhail
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