Go to your PBX interface: pbx.mixvoip.com Enter your logins : username and password.
Access the Extension section. Add a new extension.
Number Enter the number you want to assign to the phone (emergency numbers like 112 or 113 are prohibited).
Name Enter the name of the extension.
Mac Enter the Mac address that’s written on the back of the phone (begins with 000413xxxxxx).
Click Apply and do not forget to PUSH the configuration.
Go to the Configuration section and copy the provisioing link.
When you’ve copied the provisioning link, go to the phones Webinterface.
Acces the Webinterface of your Phone by entering the IP address in your Browser.
Click on Advanced (1) then Update(2).
select Update automatically (3).
Setting URL Paste the provisioning link (4).
Apply and reboot.