[SIPForum-discussion] Is to-tag mandatory ?

[Abhisek Acharya]

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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