[SIPForum-discussion] Is to-tag mandatory ?

[Abhisek Acharya]

hi guys,

I have few traces where it does have To tag in 302 redirection responses.So
Mehmet is correct.

abhisek


On Fri, Aug 3, 2012 at 7:31 PM, mehmet <eng.mehmetozi at gmail.com> wrote:

> It just says only 100 Trying may not include tag in To header, does
> not say about 302. Also tells you have to add for all responses. So it
> is mandatory for 3xx responses according to my understanding
>
> 2012/7/31 Abhisek Acharya <abhisek.acharya at gmail.com>:
> > SO we could    summerize that the TO-tag is mandatory in 18x responses to
> > create a early dialog and this is not mandatory in 3xx responses.
> > This is how the email chain was initiated earlier.Please correct me if i
> am
> > wrong.
> >
> > Regards
> > Abhisek
> >
> > On Sat, Jul 28, 2012 at 2:09 AM, Gyorgy Kovacs <
> gykovacs.datanet at gmail.com>
> > wrote:
> >>
> >> Hi,
> >>
> >> I guess it is.
> >>
> >> Regards,
> >> Gyorgy Kovacs
> >>
> >> RFC 3261 8.2.6.2 Headers and Tags
> >>
> >> The >From field of the response MUST equal the From header field of
> >>    the request.  The Call-ID header field of the response MUST equal the
> >>    Call-ID header field of the request.  The CSeq header field of the
> >>    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.
> >>
> >>    If a request contained a To tag in the request, the To header field
> >>    in the response MUST equal that of the request.  However, if the To
> >>    header field in the request did not contain a tag, the URI in the To
> >>    header field in the response MUST equal the URI in the To header
> >>    field; additionally, the UAS MUST add a tag to the To header field in
> >>    the response (with the exception of the 100 (Trying) response, in
> >>    which a tag MAY be present).  This serves to identify the UAS that is
> >>    responding, possibly resulting in a component of a dialog ID.  The
> >>    same tag MUST be used for all responses to that request, both final
> >>    and provisional (again excepting the 100 (Trying)).  Procedures for
> >>    the generation of tags are defined in Section 19.3.
> >>
> >>
> >>
> >> On 07/27/2012 03:09 PM, vikas jain wrote:
> >>
> >> Hello All,
> >>
> >> Is to-tag mandatory for 3xx-6xx responses ( specially in 302 response )
> ?
> >> I didn't find it in RFC 3261.
> >> Please help.
> >>
> >> Thanks,
> >> Vikas Jain
> >>
> >>
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