Bluetooth iPod adapter compatibility

I recently purchased a WiRevo bluetooth adapter to be paired with a Plantronics Voyager 855 stereo bluetooth headset. I got them to pair, and I was able to play/pause, forward/reverse the tracks, but there's no music. Occasionally, there will be a burst of noise, lasting less than a second, but for the most part, I can't hear anything.

I've paired the adapter with two other headsets, a Logitech Freepulse and a Lubix NC1, and it only worked with the Lubix. I know my headset works because I've paired it with my bluetooth phone, MyTouch 3G, and another adapter, a Jabra a125s. Is there a reason the WiRevo can't work properly with the Voyager 855? They're both bluetooth 2.0, support AVRCP and A2DP. The only reason I want this particular combination to work is that the others aren't doing what I want: be able to control my iPod and pick up calls. The others can't do both, or do both poorly; the Jabra a125s has some serious interference problems, the Freepulse has no phone connectivity, and the Lubix NC1 has poor audio quality and they keep falling out of my ears.

Here's my setup:

Plantronics Voyager 855
WiRevo bluetooth adapter
iPod Video 30gb