exten => _0.[1-9]XXX.,1,Playback(hello-world)
exten => _0.[1-9]XXX.,2,Set(foo=${ENUMLOOKUP(+437203001721)})
exten => _0.[1-9]XXX.,3,Playback(transfer)
exten => _0.[1-9]XXX.,4,Dial(${foo},30)