Thank you for your email.
Please be advised Resonline does not support Apple iCal connection. Airbnb iCal is specifically designed for the Airbnb platform as a one way channel connection for availability/stop sells only.
Should you decide to use the iCal on other platforms it may work depending on when the platform calls for availability/stop sells. Resonline unfortunately does not support connection to external platforms using iCal other than Airbnb.
Thank you for understanding.