{TAIL ~ The controller} inserts a five digit prefix, {HEAD ~ namely the access code} into the dialed number 
{ TAIL ~ The controller } inserts a five digit prefix , { HEAD ~ namely the access code } into the dialed number
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH