Neumaerker Elke wrote:
>
> Hello,
>
> In the SIP specification is written :
>
> "While CANCEL can terminate any pending request other than ACK or CANCEL,
> it is typically useful only for INVITE".
>
> How has a Registrar to react on receiving a CANCEL for REGISTER, if the
> registration is still in progress?
Presumably, it will send a "200 OK (CANCEL)" to respond to the CANCEL req-
uest and a "487 Request Terminated" to respond to the REGISTER request.
Note that if the Registrar has already issued a "200 OK (REGISTER)" to the
REGISTER request before it got the CANCEL, the CANCEL has no impact on
further processing. The Registrar will still issue a "200 OK (CANCEL)" to
respond to the CANCEL transaction.
Regards,
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group
Lucent Technologies/Bell Labs Innovations 263 Shuman Blvd., Rm 1A-413
Naperville, Illinois 60566 Voice: +1 630 224 0216 Fax: +1 630 713 0184
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