First thing I would suggest is that you install a stock 2.17 rom (no customized versions) and try to receive a call. If it works fine then its something you've installed manually or through the custom ROM.
Also, do you have an active data session in progress on a 1x connection? If so, that will cause the call to go to voicemail and not ring at all.
Another thing to try is to adjust the slot cycle index. Look in the reg tweaks section as it will make the phone realize its getting a call sooner.
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