Hi, unwanted silent mode!!

if im in a call on my passport, if i receive a message during the call or mail or any thing else, after i finish my call looks to be like in silent mode, no more ringing or alert untill im Restart the mobile!!
Any one can help please?

Regards,
Ayoub.

So if you pull down the settings menu and tap on the Notifications square, it won't return to normal ?