asterisk users - Jan 2008 - How to check if a SIP phone is forwarded without ringing it ?

Hi,

I feel I've read a thread about this previously but I couldn't find it.

Is there way for an Asterisk server to check if a sip phone is forwarded
without bothering phone's user ?
I was thinking of some Alert-Info option that would let the phone reply with
a 302 Moved Temporarily or 182 Queued message and not let the phone ring or
display anything on its screen.

So that, you could just cancel this call to be able to tell if an extension
is forwarded without bothering users.

Regards
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Olivier wrote:
> Is there way for an Asterisk server to check if a sip phone is forwarded
> without bothering phone's user ?
No.
> I was thinking of some Alert-Info option that would let the phone reply
> with a 302 Moved Temporarily or 182 Queued message and not let the phone
> ring or display anything on its screen.
According to the SIP RFC, a SIP endpoint is supposed to respond to an
OPTIONS message the same way that it would respond to an INVITE message
with the identical destination, but I've never seen a phone respond to
an OPTIONS message with anything but '200 OK', even when a redirect
(forward) is in place.

-- 
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience" (TM)

2008/1/9, Benny Amorsen <benny+usenet at
amorsen.dk>:
>
> Olivier <oza-4h07 at myamail.com> writes:
>
> > As using OPTIONS requests main benefit is to non-phone specific, what
> > shall we do when most vendors do not comply with RFC ?
>
> Write polite letters to the vendors?

To get a polite "go to hell !" in return ?  ;-)

/Benny
>
>
>
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Olivier <oza-4h07 at myamail.com> writes:
> To get a polite "go to hell !" in return ?  ;-)
I think the vendors will be nicer than that. Asterisk has a good bit
of the VoIP PBX market.


/Benny