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 {HEAD ~ DTMF}, is monitored and accumulated by the adapter 
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 { HEAD ~ DTMF } , is monitored and accumulated by the adapter
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH