: Navigate to the "Hot Line" settings in the device web interface and check the Enable Hot Line function.

, the "Hot Line" feature allows a specific port to immediately connect to a destination number upon activation.

: In a standard US outlet, you might find two hot wires (often black and red) and one neutral (white). This setup allows one half of a duplex outlet to be switched while the other remains constantly powered.

: You can program the auto-dial number using a standard Touch Tone phone. Detailed steps are available in the Viking K-1900 Series Instruction Manual .

If your query relates to electrical wiring, "2 hot lines" refers to a or two-phase power setup.