Door phones' system settings can be either accessed on the device or on its interface.
Access the Device Settings
You can set up some basic settings on the device screen by pressing 9999 + Dial key + 3888 (password) on the Dial screen.

Access the Device Web Settings
You can enter the device IP address in a browser and log into the device web interface where you can configure and adjust parameters.
Check the IP address on the device Settings > Info screen.
Or, use the IP scanner to scan the device IPs on the same LAN.

Note
Download IP scanner:
https://knowledge.akuvox.com/docs/akuvox-ip-scanner?highlight=IP
See the detailed guide:
Google Chrome browser is strongly recommended.
The initial user name and password are admin and please be case-sensitive.
Your computer should be on the same network as the device.