Automatic telephone number indicating device
Interface for connecting standard telephones to party lines
Low cost telephone caller identification device and method
Low noise multi-elevator communication system and method
Method and apparatus for selectively delivering telephony signal
Multi use telephone extension control circuit and device providi
Reserved speech path forming method in a parallel-connected tele
Telecommunication controller having a telephone line sharing fun
Telecommunications subscriber line interface circuit and party i
Telephone off-hook detector circuit
Telephone port with automatic detection and secure
Telephone station remote access device and method