IPBrick Groupware - iOS
From wiki.IPBRICK.COM
* * How to add the IPBRICK.MAIL calendar on IOS * *
Access Phone Settings
Select Calendar
After entering the data shown above, the advanced settings menu will appear.
To fill in the "Account URL" input field, you need to access IPBRICK MAIL in your browser and follow the following steps.
In the top bar select the calendar icon
Open the following submenu
Copy the CalDAV URL only up to your username. In the example given, up to "marketing".