Lost all sound and ringtone just after upgrade to iOS 6.1

Hi

 

On my brand-new iPhone 5 I have seem to have lost all sound and ringtone just after upgrade to iOS 6.1

A complete reset does not solve this issue.

If I press the volume buttons the internal speaker is shown as output source.

 

Does anyone know how to solve this annoying problem.

 

Thanks in advance

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