asterisk users - Jan 2010 - Send 503 or 603 error after answer()

Hello list.

Is it possible in the Asterisk dialplan to send a 503 Service
Unavailable of 603 Decline after having answered the call with Answer()
in the dialplan ??

Suppose that I first want to check the call in a MySQL-database, while I
put some MoH, and then let the call go through or "send" some error to
my ITSP where the call comes from.
I know there is something like 'early media', but isn't it good
practise
to always have Answer() in the dialplan ?

Another thing why I want to have this 503 or 603 after having Answered
the call :
my ITSP offers the ability to have a backup number for the call if it
can't get through. If I send the call to a queue and there is nobody in
the queue at that moment, I want to send a sort of error so my ITSP will
send the call to a backup number, like my cellphone.
If I send the call myself to my cellphone, I will have to pay big time
and it's a waist of bandwidth...

Kind regards,

Jonas.
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jonas kellens wrote:
> Is it possible in the Asterisk dialplan to send a 503 Service
> Unavailable of 603 Decline after having answered the call with Answer()
> in the dialplan ??
No. Answer generates (for a SIP channel) a '200 OK', which is a final
response. You cannot send any further final responses for that INVITE.

You need to not answer the call until you really want to answer it and
keep it.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org