Oki MC780fx - Telephone Extension Connection

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Connecting the Cables
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When connecting the telephone as an
extension telephone
Insert the telephone line cable (that is connected
to a controller such as the PBX) into the [LINE
connector].
Insert the cover provided with this machine into
the [TEL connector].
LINE Connector
Telephone
Cable
TEL Connector
Public Network
(Analog)
Controller
such as PBX