[SIPForum-discussion] Processing REGISTER request

[Arnab Biswas]

Hi Shakthi,

Please see the inline comments...
"If it does agree, *it MUST
         remove the binding only if the CSeq in the request is higher
         than the value stored for that binding.*  Otherwise, the update
         MUST be aborted and the request fails."

If the CSeq is greater than the old value, the new request, i.e. the
REGISTER is a new one (reREGISTER). This new one basically updates the old
expiry value. If the CSeq value is the same then it is a retransmitted
REGISTER and should be ignored.

"want to know where the value for the binding will be stored" ---- In the
REGISTRAR.

Thanks,
Arnab

Hi All..!
>
>     Can anyone explain this stanza? I want to know where the value for the
> binding will be stored ?   (which is taken from rfc 3261, section: 10.3,
> Point no. 6)
> PLz explain me the content shown in BOLD format.
>
>
>
>
> The registrar checks whether the request contains the Contact
>          header field.  If not, it skips to the last step.  If the
>          Contact header field is present, the registrar checks if there
>          is one Contact field value that contains the special value "*"
>          and an Expires field.  If the request has additional Contact
>          fields or an expiration time other than zero, the request is
>          invalid, and the server MUST return a 400 (Invalid Request) and
>          skip the remaining steps.  If not, the registrar checks whether
>          the Call-ID agrees with the value stored for each binding.  If
>          not, it MUST remove the binding.  If it does agree, *it MUST
>          remove the binding only if the CSeq in the request is higher
>          than the value stored for that binding.*  Otherwise, the update
>          MUST be aborted and the request fails.
>
> -
> Thanx in advance
>
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