Iñaki Baz Castillo wrote:
> 2009/8/4 Dale Worley <dwor...@nortel.com>:
>> Some SIP systems will not accept INVITEs from phones that are not
>> registered with the system. This is not a requirement of SIP, but it
>> appears that your system enforces this requirement.
>>
>> In regard to the specific "487" response, its purpose is to report that
>> the processing of a request was terminated by a CANCEL. So it appears
>> that that response code is being used incorrectly here.
While 487 is the typical response to an INVITE that has been terminated
by a CANCEL, AFAIK there is no restriction that 487 *only* be used when
a request has been canceled.
I think it is technically ok to use this response here, if the goal is
to be vague about why.
(Or, I guess you could pretend that a proxy on the path first passed the
message on, then decided to send a CANCEL. To the UAC it would look the
same.)
> Yes, I don't understand why vendors don't use "403 Forbidden" (with
> appropiate reason phrase) in these cases.
I do agree that if the intent was to forbid incoming calls from anyone
not registered to this system, then 403 would be a much more suitable
choice.
Thanks,
Paul
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