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