Dahua DH-VTO9221D

53
Figure 6-5
6.2.5 Unlock via VTH
When VTH is being called, monitored or on a call, it all can remotely unlock VTO.
After it hangs up or countdown ends, it can return to standby interface.
6.3 Call Function
6.3.1 Call MGT Center
Press on VTO screen to call MGT center, see Figure 6-6.