I'm also seeing this issue on my TP2. I know I've seen it on every 6.5.x ROM I've tried, and I believe also on every 6.5 ROM (though I'm not sure about that).
Incorrect behavior
The symptom I see is as described in the first post. No matter how I attempt to make a call (dial a number from the stereo, dial a number from the phone, answer an incoming call from either the stereo or the phone) the call drops after about 5 seconds of being connected.
Bluetooth for Windows Mobile Version 1.9.2 shows this problem (either Build 200 like is in NRG or Build 500 like is in MightyROM). Earlier versions of Bluetooth for Windows Mobile (like the one that came with the stock Verizon 6.1 ROM) work fine with the JVC unit.
I had taken some notes which I can't find, but I could flash the stock VZW ROM to get the bluetooth version from it if that would be useful. I believe it was 1.7.8, but I could be wrong.
Car hardware
- Head unit: JVC KW-NX7000BT (which is a KW-NX7000 stereo packaged with the JVC KS-BTA200 bluetooth adapter).
- Works fine with my wife's LG vx8350 phone - I can pair and place/receive calls using the JVC unit, so I know it's at least doing something right.
Phone software
Most recently, I'm seeing this exact issue on MightyROM 012010, Energy.RHOD500.23518.StandardM2.5_MaxManila_25.Jan .2010, and the "official" Verizon 6.5 upgrade
Phone hardware
Verizon Touch Pro 2
Stock Verizon radios
I'm really tempted to go back to the stock Verizon 6.1 ROM. It really sucks after I've used MightROM and NRG's 6.5/6.5.x work, but I really can't stand not having bluetooth working in my car and I'm not up for shelling out $700+ for a new navigation unit to workaround this issue.