iPhone Incoming Call Sound Issue

[mrplant]

I have an app running on the iPhone. This game plays mp3 and various wav sounds.
It runs fine on iPad and I implemented a GLB_On_Pause feature that pauses the game when for example hime button is double clicked and you return to app.
This works fine on iPad. Same on iPhone if I do the double click test - everything is fine.
On the phone, however, if there is an incoming phone call - all is fine until call is over. Then game is still on pause. I press a key and it starts again. Mp3 music continues but there is no .wav audio at all.
I need to relaunch the game for this to fix itself.

Anyone else notice this and is there a fix? Is perhaps the game volume at 0 after the phone call (only)?
There doesn't seem to be to be anything us users can fix from our end - especially given the fact the same code works otherwise...

[ampos]

I have seen it on many iOS games; perhaps it is not related to GLB but to iOS itself.