Technique for reconnecting office line to key telephone system a

Telephone

Telephone

Telephone and key telephone system having electronic directory f

Telephone and telephone system having improved one-touch calling

Telephone and telephone system having temporary transfer and hol

Telephone apparatus

Telephone apparatus capable of setting card unit therein

Telephone call and voice processing system

Telephone calling method and telephone apparatus

Telephone circuit controller apparatus

Telephone circuitry with power backup

Telephone conversion device

Telephone entrance terminal and network interface

Telephone exchange apparatus and incoming call transfer...

Telephone extension switch hook state detection system

Telephone intercom device

Telephone key systems and key stations therefor

Telephone line lockout device

Telephone line status circuit