Let's move to the MiRTA PBX web interface to create an AMI user for allowing ADAT connection to the PBX.
In the Settings page locate the Manager Users button and proceed to the configuration page
Adding one or more users. One user is enough.
Now get back to ADAT and start configuring it accessing the Settings menu entry.
Set the credentials for AMI in the Account / Server section
And the extension to monitor in the Account / Extension section
Now, when a call reach your extension, a popup will show you the caller ID. Using the input box, you'll be able to dial from your desktop.