Iphone Siri problem.help.?

I got my new iphone 4s 2 days ago,and ive been using Siri a lot and last night suddenly the voice activation was silent but it still answered my requests.
can anyone help me how i can get Siri's voice back?

?2011-10-19T08:32:02Z

Go to settings and turn your volume up? Mute/ sound switch?
Restart?

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