[SIPForum-discussion] To-Tag in REGISTER message

[Pranav Damele]

Hi ,

I second to Vijay. That is why Max-Forwards header is not required in
responses.

*Cheers* ,
Pranav Damele

On 1 November 2012 10:26, Vijay Badola <Vijay.Badola at onmobile.com> wrote:

>  In addition to other answers given by others, loop detection is found
> when the same request comes at same sip node again without getting final
> answer (then we check whether its loop or not). The case you are talking
> about First request is already answered, so as per my understanding, in
>  any case request  will not be responded with 482 response code by the
> server who has already created final answer for earlier request (although
> SIP node may ignore the request if you try to send request with same
> parameter in new request, which will never be the case I think).
>
>
>
> *,Regards*
>
> *Vijay Badola*
>
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> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *Keerthi Srinivasan
> *Sent:* Tuesday, October 30, 2012 4:48 PM
> *To:* sip-implementors at lists.cs.columbia.edu; discussion at sipforum.org
> *Subject:* [SIPForum-discussion] To-Tag in REGISTER message
>
>
>
> All,
>
> When UA sends REGISTER request to the server it does not contain the
> To-Tag and Server is accepts the Registration (200 OK) will have the To-Tag.
>
> If the Refresh or Deregister does not have the To-Tag in the REGISTER
> message. Is the server will accept the Refresh or Deregister REGISTER
> message or will send 482 Loop Detected as per the RFC3261 (8.2.2.2 Merged
> Requests)
>
> Here is the RFC3261 content:
> 8.2.2.2 Merged Requests
>
>    If the request has no tag in the To header field, the UAS core MUST
>    check the request against ongoing transactions.  If the From tag,
>    Call-ID, and CSeq exactly match those associated with an ongoing
>    transaction, but the request does not match that transaction (based
>    on the matching rules in Section 17.2.3), the UAS core SHOULD
>    generate a 482 (Loop Detected) response and pass it to the server
>    transaction.
>
>       The same request has arrived at the UAS more than once, following
>       different paths, most likely due to forking.  The UAS processes
>       the first such request received and responds with a 482 (Loop
>       Detected) to the rest of them.
>
> Is the Server MUST reject or Accept the Refresh / Deregister REGISTER
> request?
>
> --
> Regards,
> Keerthi
>
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