Dahua VTH1550CH - Cybersecurity Recommendations; Mandatory Actions for Cybersecurity

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Overview
 Video talk function between VTO and VTH can split into 3 types:
 You should set up VTO and then set up VTH to successfully connect those two
types of devices.
1 VTO
+
1 VTH
1 VTO
+
mVTH
n VTO
+
m VTH