Communication apparatus having alternate message communication

Details Communication apparatus having alternate message communication Communication apparatus having alternate message communication

1991-01-28

1992-08-25

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379156, H04M 1100

Patent

active

051425670

ABSTRACT:
A message communication apparatus includes a connection unit, including a DC loop forming circuit, a DC loop detection circuit, and relays, for connecting a data communication apparatus through a connection line, a message communication unit, including a message circuit and a handset, for performing message communication without being through the data communication apparatus, a requesting unit, including a hook switch, for requesting a connection between a communication line and the message communication unit, an IR sending circuit for generating a ringing signal to the data communication apparatus upon detection of an incoming call, and a control circuit for connecting the communication line and the data communication apparatus upon detection of the incoming call when the requesting unit does not output a connection request.

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