[Asterisk-Users] Wait for dialtone

[AbdelRahman Tarzi]

Is it possible after dialling a trunk prefix to wait for dialtone (or wait 2
seconds) before continuing to dial the outgoing number ?
 
I need to "hunt" for one of several lines, and when one successfully
provides dialtone, to continue dialling.. 
 
A simple NO will do, but if there's a workaround, I have not found it. 
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