Currently Being ModeratedNov 17, 2013 1:32 PM (in response to Tomf32541)
Welcome to the Support Communities!
There are two places to check on your iPhone for sound settings for alerts:
Set notification options. Go to Settings > Notification Center. Tap an app to set its notification options.
Also, check the sound settings on your iPhone to make sure there are no alerts turned on there as well:
Go to Settings > Sounds to:
Set ringtones and volume
Set vibration options
Set the sound for new voicemail