How can configure Dahua Video Intercom System "1*VTO "DHI-VTO2111D-S-S2 and 2*VTH "DHI-VTH2421F-P". 

Video Intercom Configuration:
1. Initialize Devices.
2. Go to Webpage of VTO to configure:
A. Local Settings “Device Type, Device Name, Access Control Settings”.
B. Network Parameter “SIP settings”.
C. Go to Household Setting “VTO & VTH Management”.
D. Check Status.
3. Configure VTH.