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When my app receives a voip push, I play an audio file using AudioServices using: AudioServicesPlayAlertSoundWithCompletion If the app is in background, the volume is fine (Using ringer volume). But if i long press the notification, the background audio file playing suddenly jumps to max volume. I looked at console logs and here is what I found: default 09:04:06.892055-0800 mediaserverd -CMVAEndptMgr- vaemSetDeviceVolume: Setting cmsvolume = 0.465 for device UID: VirtualAudioDevice_Default with ID: 163 and port=0 and timerCreated = NO When I long press, the volume jumps to max for no reason. default 09:04:27.253755-0800 mediaserverd -CMVAEndptMgr- vaemSetDeviceVolume: Setting cmsvolume = 1.000 for device UID: VirtualAudioDevice_Default with ID: 163 and port=0 and timerCreated = NO