Technique for compensating for signal attenuation on a telephone

Techniques for improving telephone audio quality

Teleconferencing device having acoustic transducers...

Telephone apparatus

Telephone apparatus with call transfer function and with improve

Telephone device

Telephone handset detector

Telephone having a speech ban limiting function

Telephone having automatic gain control means

Telephone having four VAD circuits

Telephone instrument

Telephone receiver transmitter device

Telephone set

Telephone set

Telephone set in which an echo signal is effectively cancelled i

Telephone set which can be adjusted in response to ambient noise

Telephone terminal apparatus and method

Telephone with background volume control

Telephone with hands-free operation

Telephone-computer interface