Thanks big bob for that info.
I'm wondering what's the fewest things I could initially purchase just to check that the unit's working for me before I fully kit it out. I don't think I need the BT antenna or even the microphone yet - just to check that the tcu is showing up on the head unit and that I can pair a phone with it.

Also I've been looking for an explanation of what things like "TEL_NF" and other abbreviations mean. I saw the pinout for the BM24 and saw that it has "tel_audio_in" +,- pins. But from what you say I'm guessing this is different to "TEL_NF" pins. Can anyone point me to a guide, or should I start trying to understand the WDS?

Also, the tcu I got is a USA Everest 2005 model. I know this a CDMA version and the Assist portion of it won't work for me. But - unless the tcu uses rSAP - I can't see any reason why the bluetooth part won't work for me.

sim,