An audio microphone is also physically situated near the doorbell switch, for generating {HEAD ~ electrical signals} responsive to {TAIL ~ sounds} made near the doorbell switch and transmitting the signals to the telephone line to the remote telephone 
responsive to
An audio microphone is also physically situated near the doorbell switch , for generating { HEAD ~ electrical signals } responsive to { TAIL ~ sounds } made near the doorbell switch and transmitting the signals to the telephone line to the remote telephone
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH