Sensor circuit for telephone line
Signal-processing method and system for off-hook notification
Speakerphone with fast idle mode
Speaking apparatus having handfree conversation function
State machine based universal voice grade cards
Subscriber circuit provided with a circuit for monitoring a subs
Subscriber circuit with built-in polarity switching circuit
Subscriber line circuit having an improved offhook supervision c
Subscriber line control apparatus to concurrently detect change
Subscriber line interface circuit having means for combining DC
Surge protected electronic switch for telephone voiceband circui
Switch hook status determination in a communication system
System and method for deriving sealing current
System and method for detecting an off-hook condition
Systems and methods for an electronic hook switch for...
Systems and methods for an electronic hook switch for...