When an iOS device receives and answers a call that interrupts a UE4 game, the game will no longer have audio after the call in completed.
Expected: End of call returns to gameplay with audio.
Actual: End of call returns to gameplay without audio.
The audio for a UE4Game did not work when resuming the app after answering a phone call, on an iPhone 7 with iOS 10.1.1. (Log attached)
Start game with sound on iOS device (iPhone 7 tested).
Have an incoming call to the device playing the game.
Answer the call.
After a bit of time, end the call.
After resuming the game, there will be no audio.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-39069 in the post.