Can't use volume button to mute on iOS7

Question

I've migrated my VoIP application to iOS7 recently, and there's an open bug still remaining which I can't understand.

When in VoIP call, in iOS6 you can push the physical volume button to lower the volume, down to Zero.

Now, in iOS7, I can lower the sound only down to the last step before zero, which means the volume cannot be muted.

I suspect this is something that's on iOS7 side, since I don't have the problem with the same IPA on an iOS6 device.

Anybody knows what's up?

Answer 1

Same problem with my VoIP app...

My Solution: After everything is set up, set the category to Playback,

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

Then set it back to PlayAndRecord,

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

This works for me, hope this helps someone who comes across the same problem.