I've have this same issue. In my case it appears to be hardware related, specifically the headphone jack. The ringtones will play just fine, but the speaker and mic appear to be completely disabled otherwise. A bluetooth headset or wired speaker/mic work fine though. Many other people in other forums have reported this as an issue w/ the 6700s. They suggested carefully sticking a toothpick into the headphone jack and attempting to clear the stuck switch and/or contacts. That hasn't worked for me yet, nor has tapping it, or using electrical contact cleaner. I'm going to take mine apart this weekend and I can let you know the results if you're interested.
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