An audio speaker is physically situated near the doorbell switch, for reproducing {HEAD ~ audio signals} from {TAIL ~ the telephone line} which are generated at the remote telephone 
from
An audio speaker is physically situated near the doorbell switch , for reproducing { HEAD ~ audio signals } from { TAIL ~ the telephone line } which are generated at the remote telephone
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH