Sorry for the late response, but the Cisco SIP Proxy Server (CSPS) allowed for retargeting from sips to sip. Whether or not to allow this is configurable, and it is disabled by default. I do not recall what we did in terms of sip to sips, but I think we allowed it as well. This was done in 2003 and not changed since as far as I know.
Cheers, Charles > -----Original Message----- > From: Dean Willis [mailto:[EMAIL PROTECTED] > Sent: Thursday, March 29, 2007 12:12 PM > To: IETF SIP List > Subject: Poll: Do we have sips/sip retageting in the wild > (was Re: [Sip] RE:Securing Other URI (Tel URI) scheme) > > > On Mar 29, 2007, at 12:01 PM, Francois Audet wrote: > > > I don't agree. > > > > I think this is theoretical. I don't believe proxies that "upgrade" > > from SIP to SIPS using a retargeting exist in nature. And > if they did, > > they > > would likely break stuff, or have some assumptions that makes them > > essentially proprietary. It just doesn't work except for some very > > narrow sceanrios (e.g., transactions that don't create a dialog, or > > dialogs > > with double Record-Route used at the retargeting point, along with > > endpoints that > > don't understand SIPS but somehow don't choke on the > scheme, use of > > SIP > > outbound > > which is not standard yet, etc.). Same applies for downgrades. > > > > So to me, it's a non-issue. > > > > From a standard's purist dreamland point of view, we could define > > this extension: it would not "break" anything. It would just make > > the spec more complicated for no good reason. > > I used to have a proxy at the house that would retarget inbound from > sips to sip to let my old 3Com phone work. It would also > retarget sip > to sips outbound so I could call sips (said proxy is why I insisted > on last-hop exception in 3261). Such proxies do exist. > > The good news is, I don't use it anymore (the bad news is I don't > have a working SIP phone at home right now). > > So (Chair Hat on): Anybody else out there have a proxy currently (or > planned to be) in use that retargets sip to sips or vice versa? > > If we can't come up with any, I suppose I'd be willing to > concede the > issue as "fixing an improbable problem" > > -- > Dean > > > _______________________________________________ > Sip mailing list https://www1.ietf.org/mailman/listinfo/sip > This list is for NEW development of the core SIP Protocol > Use [EMAIL PROTECTED] for questions on current sip > Use [EMAIL PROTECTED] for new developments on the application of sip > _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
