The controller is transparent to incoming calls and local outgoing calls, as well as {HEAD ~ certain excepted calls} which commence with {TAIL ~ the digit} 1 
The controller is transparent to incoming calls and local outgoing calls , as well as { HEAD ~ certain excepted calls } which commence with { TAIL ~ the digit } 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH