Oh and before anyone corrects me, I actually used "Require: path" (not Requires as written in the e-mail)
-----Original Message----- From: Attila Sipos Sent: 02 April 2009 16:01 To: 'Paul Kyzivat' Cc: sip-implementors@lists.cs.columbia.edu Subject: RE: [Sip-implementors] What's the harm in always adding Path at the proxy? (RFC3327 question) Would you believe it? I tried it out and I got: 5) the proxy adds Path and adds Requires:path. The registrar doesn't support it, doesn't copy the Path and doesn't use it. Welcome to SIP in action!!! -----Original Message----- From: Paul Kyzivat [mailto:pkyzi...@cisco.com] Sent: 01 April 2009 17:06 To: Attila Sipos Cc: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] What's the harm in always adding Path at the proxy? (RFC3327 question) If you do as you propose there are good cases and bad cases. Good cases: 1) the proxy adds Path, but *doesn't* add Requires:path. The registrar *honors* the Path request, echoing it in the response. And uses it for future requests. 2) the proxy adds Path, but *does* add Requires:path. The registrar supports it, *honors* the Path request, echoing it in the response. And uses it for future requests. Bad cases: 3) the proxy adds Path, but *doesn't* add Requires:path. The registrar rejects the request, as recommended by RFC 3327. 4) the proxy adds Path, but *does* add Requires:path. The registrar doesn't support the path option, and so rejects the request with 421. Whether the bad cases are really bad depends on how essential the proxy is. If it believes it is so essential that its ok to fail the registration if it can't get on the Path, then it might as well do so. Thanks, Paul In this case, Attila Sipos wrote: > > A Path header can be added by a proxy if a UA indicates support for > "path". > > But what harm is there in adding it if "path" isn't supported by the UA? > > I can't see any, except it would screw up a stupid UA implementation > which cries when it receives unknown SIP headers. > > Is that all? > > Regards, > > Attila > > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
