I have an older BlueTrek headset (http://www.bluetrek.com/bluetrek/bluetrek1.0.htm) that worked flawlessly with my T608, but won't make a sound for the Treo 650. Pairing was uneventful, but sound isn't transferred on outgoing calls, and the Prefs/Handsfree/Autoanswer doesn't even answer, let alone transfer sound. (It does make the little "ring" jingle in the headset, though.) The Bluetooth icon "color inverts" for a couple of seconds, then reverts to normal, but no error message or other diagnostic signal is evident.

Has anyone else tried this headset? Just wondering if this is a headset-specific problem or another Treo wierdness...