Hi Maxim,

Surely it says in the text you've quoted "and MUST maintain the same
ordering"?


On 6 October 2015 at 10:10, Maxim Sobolev <sobo...@sippysoft.com> wrote:

> Sorry, I've obviously put colon instead of semi-colon in my example, the
> correct one should read:
>
> SIP/2.0/UDP 1.2.3.4;foo=bar;bar=baz
>
> vs.
>
> SIP/2.0/UDP 1.2.3.4;bar=baz;foo=bar
>
>
> On Mon, Oct 5, 2015 at 4:06 PM, Maxim Sobolev <sobo...@sippysoft.com>
> wrote:
>
> > Hi everybody,
> >
> > We came across a device that inserts some non-standard parameter into one
> > of the Via headers of request and has an issue dealing with situation
> when
> > this parameter is moved by our UAS to a different position of that
> > particular Via header in the response. Therefore, my question is: are we
> > actually required to preserve order of parameters in each Via or not? The
> > RFC is not very clear on that matter, all it says is:
> >
> > 8.2.6.2 Headers and Tags
> >
> > [...]
> >
> >    response MUST equal the CSeq field of the request.  The Via header
> >    field values in the response MUST equal the Via header field values
> >    in the request and MUST maintain the same ordering.
> >
> > To me, this boils down to the question of what we call "equal" field
> values, can the field values below be considered equal:
> >
> > SIP/2.0/UDP 1.2.3.4:foo=bar;bar=baz
> >
> > vs.
> >
> > SIP/2.0/UDP 1.2.3.4:bar=baz;foo=bar
> >
> > Speaking from experience, it's probably bad idea to bet on UAS keeping
> order the same when developing your own UAC code, but if somebody decides
> to do it, can they claim that you are violating RFC if you don't?
> >
> > Thanks!
> >
> > -Maxim
> >
> >
>
>
> --
> Maksym Sobolyev
> Sippy Software, Inc.
> Internet Telephony (VoIP) Experts
> Tel (Canada): +1-778-783-0474
> Tel (Toll-Free): +1-855-747-7779
> Fax: +1-866-857-6942
> Web: http://www.sippysoft.com
> MSN: sa...@sippysoft.com
> Skype: SippySoft
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
>



-- 
David Cunningham, Voisonics
http://voisonics.com/
USA: +1 213 221 1092
UK: +44 (0) 20 3298 1642
Australia: +61 (0) 2 8063 9019
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors

Reply via email to