The Vx810 Duet supports two types of communication, dial and IP, and has a separate port on the Duet base for each type of communications cable.
The Dial Communications Cable
Plug one end of the dial communications cable into the dial port () on the base.
Plug the other end of the dial communications cable into an analog telephone wall jack.
The Ethernet Communications Cable
Plug one end of the Ethernet communications cable into the 10BaseT port on the base.
Plug the other end of the Ethernet communications cable into an Ethernet wall jack or a router.