Logon to the Axeos IP PBX and go to menu option 'Dial Settings' and choose 'Outbound'. Edit or create a new trunk.

Use the login information provided by 12VoIP and complete the settings as shown in the example screenshots below:

Once the SIP trunk has been setup, go to menu option 'Dial Settings' and choose 'Inbound' to add the phonenumbers using the following format: 31201234567