Communication terminal apparatus
Communication terminal device adapted to physical...
Communication terminal provided for a user selected...
Communication terminals with a dual use speaker for sensing...
Compatibility circuit for telephone headset
Computer telephony headset amplifier
Conference telephone system and method
Conference telephone using dynamic modeled line hybrid
Connecting device for connecting sheathed lines for telephones a
Connection apparatus for connecting a digital or analog...
Connection apparatus for connecting a digital or analog...
Control circuit for mobile telephone with full duplex operation
Control circuit having a direct current control loop for control
Control device for a hand-free alternate operating telephone set
Control device for a hands-free telephone set
Conversion of compressed speech codes between attenuated and una
Current switch for use in telephony systems or the like