[bar]
exten => 2,1,GoTo(foo,s,1)

[foo]
exten => s,1,SetCIDNum(6${CALLERIDNUM})
exten => s,2,Background(choose-or-wait)
exten => s,3,Dial(${me},,m)
exten => 1,1,SetCIDNum(9${CALLERIDNUM})
exten => 1,2,Dial(${me},,m)