[Asterisk-Users] Can asterisk detect BUSY signal?

[eduardo at garnier.inf.br]

Hi,
suppose I have agents waiting on a queue and I configure asterisk to dial out 
and to forward the call to the first agent enqueued. Asterisk will do it even if 
the answer to the call is "busy".

Is it possible to configure asterisk to detect the busy signal and, in that 
case, dial another number, without wasting agent's time?

Thanks