;; Only incoming audio, no outgoing audio:

exten => gizmoguy,1,Answer
exten => gizmoguy,n,Wait(1)
exten => gizmoguy,n,SendDTMF(1)
exten => gizmoguy,n,Dial(${PHONE})

;; Works fine:

exten => gizmoguy,1,Dial(${PHONE})