Telephone ringing module

Telephone ringing monitoring and control system

Telephone ringing signal detector

Telephone set

Telephone set and response method to incoming call

Telephone set capable of initiating facsimile communication with

Telephone set having a help key and methods and systems for...

Telephone set of distinctive ringing type capable of generating

Telephone set of distinctive ringing type wherein pattern of tel

Telephone set with on-hook line seizure

Telephone set with subscriber listing

Telephone signal detecting circuit

Telephone signal discriminator

Telephone silencing system

Telephone station equipment employing rewriteable display keys

Telephone station equipment employing rewriteable display keys

Telephone subscriber circuit with galvanic isolation

Telephone subscriber line voltage change detection

Telephone subscribers' circuits

Telephone subset arrangement