[bigmicro]

If the creator has the app (onair.io/ios , onair.io/android), they would receive notifications there and can take the call. Also, if a browser is open when someone calls them, they would also receive notifications there as well.

[the_arun]

Is there a way the creator can mark their availability on the app? May be on a calendar?

[bigmicro]

Yes. You can set yourself `always online`, or `always offline`, or `scheduled`. In the last one, you specify hours in the day (e.g. 9am-5pm), and sync with external calendar (currently Google Calendar) which marks you as offline when you're busy.