27Set ExtensionStep 1. On VTH screen, press System Settings>Project Settings, input password(default is 002236) to enter Project Settings interface.Step 2. Press Product Info. Press Master, Master icon becomes Extention icon.Step 3. Set Room No. (i.e. 1101-1), input IP Address, Subnet Mask and Gateway.Step 4. In Master IP, input IP of the main VTH. After competion, extension willautomatically sync with main VTH info configured by user. See Figure 5- 6.Figure 5- 65.2 MonitorBoth VTS and VTH are able to monitor this VTO by enabling the camera to capture localcircumstance.5.3 Unlock FunctionUnlock by CenterWhen center is called, calling or monitoring, center can remotely unlock door. VTO willreturn to standby interface after call ends or countdown stops.Unlock by VTHWhen VTH is called, calling or monitoring, VTH can remotely unlock door. VTO will returnto standby interface after call ends or countdown stops.