In a word - NO.
This is a policy thing, so you can't assume anything. (The impression
the callee wants to give to the caller is governed by sociology, not
standards.)
Do Not Disturb is a feature, or perhaps a number of different features.
The user of the feature may have his own idea of the impression he wants
to convey to the caller. At least the following are possible:
- 480: I want the caller to think I have my phone OFF
or otherwise unreachable
- 403: I want the caller to know I'm refusing him now
- 486: I want the caller to think I am busy.
- 180 (without ringing my phone): I want the caller to think
I am not near my phone.
IMO the caller should not be trying to figure out if the response is
DND. It should simply be reflecting the response it got back to its user.
Paul
Iñaki Baz Castillo wrote:
> El Friday 04 April 2008 10:07:38 Attila Sipos escribió:
>> "480 Not Available" is ok but normally 480 has the text "Temporarily
>> Unavailable".
>>
>> You can't rely on the text being shown as "Not Available" to determine
>> it was rejected for the DND reason.
>
> Yes, I just mind the status code (480) not the phrase error. My question is:
> do all the SIP phones reply a "480" when DND?
>
> Thanks a lot.
>
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