Dahua Modular VTO - Group Call Networking Scene

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Figure 3-2
3.3 Group Call Scene
When the visitor presses call key on modular VTO, multiple VTHs ring at the same time; the
resident can pick up, hang up or unlock on any VTH.
Networking diagram is shown in Figure 3-3.
 If keyboard module is connected, dial master VTH room number to call.
 VTH consists of master VTH and extension VTH. There is 1 master VTH at most and 5
extension VTHs at most.