Well that was the missing piece for me. 3500 was still working perfectly, except for the range issue with the Jabra FS2500. I applied the above directly over the top of 3500_B and I still have all the same functionality (BT DUN/ActiveSync, good sleep/wakeup response) but now I can get over 15 feet away before I start hearing interference.

Thanks again mswlogo. You have singlehandedly taken my XV6600 experience and turned it from one of extreme frustration into one of wonderful success.

jamisonwest, I've got to ask... do the GSM versions have some kind of audio gateway profile? How are you able to ever connect the audio (not headset) from your device to your car? I was under the impression no audio gateway was available, much less sort of working...