2 : Hot Line -

The guide for primarily refers to the setup and operation of specialized communication devices, most notably the Viking K-1900 Series hot line phones, or specific VoIP gateway settings. 1. Viking K-1900-D-2 K-1900-W-2 Hot Line Phones

: Simply lift the handset; the internal multi-number dialer will initiate the call to the stored number. 2. VoIP Gateway Hot Line Configuration In the context of networking equipment like the WellGate 3512 2 : Hot Line

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

: The hot wire is typically the smooth wire (black), while the neutral wire has ridges or grooves. 2 : Hot Line