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The VTO is calling the defined VTH. See Figure 4-13.
Call screen
Tap on the VTH to answer the call.
4.4.2 Monitoring from VTH
In the main interface of the VTH, select Monitor > Door.
The Door interface is displayed. See Figure 4-14.
Door
Select the VTO you need to do monitor.
The monitor screen is displayed. See Figure 4-15.
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