Key telephone system

Key telephone system

Key telephone system capable of simulation by button operations

Key telephone system provided with telephone sets connectable to

Key telephone system with reduction of delay of ring tone genera

Line switch control circuit arrangement for telephone subset

Method and apparatus for processing telephone calls from one lin

Method and configuration for controlling and/or monitoring a...

Method for interfacing between a key-phone system and a key-phon

Method of recovering speech path of pre-engaged call on restarti

Multi-line access module for telephone set

Multiple subscriber implementing method in key phone system

Private telephone system with unified command feature

Resetting circuit in a key-telephone system

Speakerphone sensing circuit

Switching arrangement for activating electrical devices

Technique for reconnecting office line to key telephone system a

Telephone

Telephone and key telephone system having electronic directory f

Telephone apparatus