Telephone applicable to PSTN and IP network and call...
Telephone applicable to PSTN and IP network and call...
Telephone charging signalling detector suitable for central offi
Telephone circuit capable of inhibiting noise of customer premis
Telephone circuits
Telephone device
Telephone device for amplifying opposite party's voice after use
Telephone for connection to a public telephone network
Telephone handset amplifier circuit
Telephone handset detector
Telephone handset emulator
Telephone handset interface device
Telephone handset interface with feedback control
Telephone handset interface with feedback control
Telephone handset microphone level adjustment
Telephone handset with user-adjustable amplitude, default...
Telephone having a speech ban limiting function
Telephone having a speech band limiting function
Telephone having automatic gain control means
Telephone having four VAD circuits