Telephone system with automatic volume control

Telephone terminal and method for supplying power to the same

Telephone terminal apparatus and method

Telephone terminal device

Telephone terminal discount accessory device

Telephone terminal having multiple handsets

Telephone terminal with control of voice reproduction...

Telephone to computer audio interface

Telephone with background volume control

Telephone with hands-free operation

Telephone-computer interface

Telephones with talker sidetone

Telephony device with compensation for line losses

Terminal apparatus having a function for preventing unnecessary

Terminal apparatus with a handset using a four pin connector

Terminal for wirebound telecommunication

Terminal impedance setting circuit for a two-wire to four-wire c

Terminal station for telecommunication by wire

Time dependant, variable amplitude threshold output circuit for

Time dependent, variable amplitude threshold output circuit for