To Reproduce:

1. Deploy attached project select scene Audio types.
2. Call from another device (tested with facetime, not cellular)
3. Decline call, observe that after returning to project no audio is playing anymore and trying to any audio clip has no effect, loading other scenes has no effect. Only way to fix this is to redeploy the app. Nothing is printed in log, but calling 'AudioSource>().Play()' seems to have no effect

Reproduced on
iPad mini 2 (iOS 9)
iPhone 6+ (iOS 8.4)