asterisk users - Dec 2004 - Digium+asterisk+festival+outgoingcall: How detect a busy line..?

Hi all..!!
 
I'm developing a system to use festival,asterisk, digium card. This system
makes a auto-dialing (using digium TE410P card), when the customer answer the
call: asterisk play an audio (pre-built from festival), that is a easy part. our
problem is how we can detect a busy line or error in the line but outside of
asterisk (by means of a process to detect status of call-line) then we can make
a control and retrying a former error outgoing call. I reviewed Vicidial but it
has the same problem (non detect a busy line before transferring the call toward
an agent)
 
We are using .CALL file in /var/spool/asterisk/outgoing directory for
auto-dialing.

Please, can anybody help me..??
 
Regards
 
Daniel
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