This is a situation I come across all the time and I can't get it to work:

My phone rings and I answer it. I want to transfer the call to my Bluetrek headset, but it was not powered on at the time. I turn on the headset while I'm talking to the caller on my Treo. Now, how do I transfer the call from the Treo to the headset?

The instructions for the Bluetrek generically advise you to press the "send" or "call" button on your phone to transfer. But on the Treo, pressing the green call button does nothing.

Does the Bluetrek actually have to be powered on before the call starts in order to be recognized?