Hi
We configure devices in our template to be used in Production environment.
You do not configure devices with Static IP Addresses. You should have a DHCP Server, And the DHCP server should have the concept of DHCP reservations.
If you want, then do not use 3CX Provisioning mechanisms because the defaults will be set for DHCP Use.
The proper way is to go on the DHCP Server, create a reservation for the mac address of the grandstream gateway and you will be assured that everytime the device boots, it will contact DHCP server and it will get the IP Address that you have reserved for it.
As for timezone, you need to configure the timezone you can find the section that relates to the timezone, and hardcode it to the timezone you need. Since it is not a phone, we might not be provisioning the time or we might be hard coding it to US time. But in any case, if it has an incorrect time, there should be no problem. A Gateway like this does not need to have it's time configured properly - it has no LCD display.