Shoichi Takashima

Private branch exchange capable of analyzing information received from ISDN

Automatic redial in a key telephone system having different line types

Communication apparatus for storing abandoned call information

Telephone apparatus capable of setting card unit therein

Communication apparatus for displaying information concerning call receptions

Control of incoming and outgoing calls in a key system

Communication apparatus with electronic notebook and telephone exchange related to the same

Communication apparatus receiving information from portable information medium

Communication apparatus storing caller information and method of operating said apparatus

Telephone exchange apparatus, and method of connecting calls therein