Dahua Technology DHI-VTH1550CH-S - General Settings; Setting System Time

Input the VTH number in the corresponding forward mode; then press OFF to enable the
forward function.
Parameter
Description
Always All incoming calls will be forwarded to preset number.
Busy
When the user is busy, incoming call from the third party is forwarded
to the preset number. If “No Answer” is not set, when the user refuses
to answer, the incoming call will be deemed as busy forwarding.
No Answer
If no one answers after VTH ring time, the incoming call is forwarded to
the preset number.
Table 5-3: Call Forwarding Options
Press OK to save settings.
5.2.6 General Settings
Set VTH time, display, password, and other parameters. .
Setting Time
Set the VTH system time, time zone, and daylight savings time (DST).
These parameters are set only on the Master VTH, and the Master VTH synchronizes the
settings to its Extension VTH devices.
Press and hold Setting until the system displays the Password Verification dialog box.
Type your password and press OK.
Select General > Time.