Currently I have a single peer (SIP) for outgoing calls.
Calls are coming over the IP/SIP and Dial out [-Dial()-] automatically.
(like Calls Termination)

Something like this..

exten => s,1,Answer
exten => s,2,Wait(1)
exten => s,3,Background(beep)
exten => s,1,Dial(SIP/123456@outgoing)

exten => s,1,Dial(SIP/123456@outgoing) <--- [Outgoing] is a peer to dialout
of Asterisk...now I have outgoing1, outgoing2, outgoing3 and outgoing4 and I want
the call to be dialed out from them if any of them is busy. I mean I want to do ACD for outbound calls......Any example or help will be highly appreciated.

thanks