Currently Being Moderated02-Dec-2012 11:00 (in response to Augusto Strutz)
This is very easy to resolve - here are the steps
3. where it says 'Use Side switch to' you will see two choices
a) Lock rotation
Mute will be ticked if you are not getting a ringtone when someone calls you on Facetime
Simply Click on 'Lock Rotation'
Lock Rotation will now be ticked
Mute will be unticked.
Facetime calls will now ring your iPad
also you must ensure your ringtone sound is On.
2. sounds ON
3. ringtone - choose a sound default is marimba