I had this exact same problem with my 750 that had WM6.0 on the Rogers Network.
My issue seemed to be a bit different then what i have read here. My 750 would not ring at all but the caller on the other side would hear ringing until it went to my voicemail. My 750 wouldn't even say missed call, it would just prompt that i had new voice mail. It was really annoying!!!
I decided to head over to XDA Developers and read about some of the cooked WM6.1 roms that were available. After updating my 750 to WM6.1 the ringer issue went away. Everything works great now with WM6.1
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