Dahua Digital VTH Quick Start Manual page 22

Be used as a master VTH.

Enter "Room No." (such as 9901 or 101#0) and press "OK" to save.
"Room no." shall be the same with "VTH Short No.", which is set when adding

VTH at WEB interface. Otherwise, it will fail to connect VTO.
In case of extension VTH, room no. shall end with #0. Otherwise, it will fail to

connect VTO.
Be used as an extension VTH.

Press [Master] and switch to "Extension".
Enter "Room No." (such as 101#1) and "Master IP" (IP address of master VTH).
"Master Name" and "Master Pwd" are the user name and password of master VTH.
Default user name is admin, and the password is the one set during device
initialization.
Press [OK] to save settings.
Press [SIP Server].
The system displays "SIP Server" interface, as shown in Figure 2-16.
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12 pt,Not Bold,Heading One,h1,Head1,Head,1,Numbered,nu,Level 1 Head,1st level,Section He
ad,Sec1,h11,1st level1,h12,1st level2,h13,1st level3,h14,1st level4,h15,1st level5,h16,h17 16
Figure 2-15