Default Trouble with cyanogenmod6 help!!!

Hey guys I recently installed cyanogenmod6 with Alpha WiMax update but I noticed after the install I can't hear my ringer when I receive incoming calls and also I am unable to call my voicemail and hear my messages if anybody know what's going And how to repair this it be a great help thanx.....

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Evo SuperSonic 4G
Xda Premium App