The called extension number, as it is {HEAD ~ dial} pulsed to {TAIL ~ the PBX} by the Central Office or sent on an E&M tie line as dial pulse or DTMF, is monitored and accumulated by the adapter 
pulsed to
The called extension number , as it is { HEAD ~ dial } pulsed to { TAIL ~ the PBX } by the Central Office or sent on an E&M tie line as dial pulse or DTMF , is monitored and accumulated by the adapter
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH