There are a few basic steps to secure your phone from external access.
Look up the IP address of your phone in the phone's Settings menu, submenu Information -> System Info.
→ Advanced → QoS/Security
Make sure you set
and click on the button " Apply".
Please do not forget to click on save at the top after every change in the web interface (WUI). Only then will your changes be permanently retained even after a restart of the phone.
You have taken the most important security measures. For an added layer of security, follow the below steps:
Confirm your changes with "Apply". These credentials will now be used to access the phone user interface.
Most users do not require the full functionality of either the phone web user interface or the phone menu.
In order to prevent users without admin rights from modifying the settings, you need to put the phone in user mode and change the default admin password (0000) on the "QoS/Security" tab.
Select the "Network" tab of the Advanced page. Scroll down to the HTTP Section and set the "Webserver connection type" to "https only".
Click "Apply" on the bottom of the page to apply the settings.
From the vertical menu on the left side of the WUI, select Preferences. Scroll down to "Lock Keyboard" and set a enable_keyboard_lock.