[Q] Voice calls

Im unable to make voice calls through the Phone app. It will connect, then make no noise (ie no ringing). Same if i receive a call, i hit accept and i hear nothing, nor can the person calling me hear anything. I can use the voice search/navigation, and i can use other voice apps (ie voxer) just fine. SMS works, as does 3g, and im not getting any error messages.

Phone is GT-I9100, Kernel is Siyah 3.1rc6, running D4rom (ICS). I've tried 3 seperate roms (Omega v11, D4, and Slim (all ICS)) all having the same issues. Im assuming this is an issues with ICS (or more likely something i didnt update prior to switching) but ive spent about 6 hours now trying to find out what is causing it.

I realize downgrading would solve this, but i'd rather find out what my issue is and fix it. any ideas?

Still no luck. Flashed 3 times, once with D4 again, twice with wanalite. did factory reset, manually wiped /data, /system, /cache, and Dalvik cache. after doing initial run (i didn't set up my gmail account, since i need wifi for that (data cap is annoying)) i tried to make a call, and it still wont ring. At first it would end the call after 15's or so. after restarting it it would go longer, usually until i end it. SMS still works, as does 3g data.

I got an error this time setting up the clock, but it was only visible for about 2s. It was something to do with setting the time, if i can get it again ill try to write it down.

Also, when wiping the Dalvik cache i get this :
E:unknown voluem for path [/sd-ext]
Dalvik cache wiped

any other advice?

I finally downgraded to GB rom (unnamed). Phone worked fine, as well as everything else. Ty for your help though, It was greatly appreciated.

Also, i noticed prior to updating it that the search and back buttons didnt do anything. IDK if this is normal or not, i dont use those buttons much.