
I don't have an ipaq, but I have used the headphones with an x50v. I'm assuming that you are using wm2003.
Do you have the audio gateway in your bluetooth manager? If you don't have that profile, you should DL the bluetooth update from the HP site.
They are also very finicky about pairing and you have to pair them to the pda before you use the gateway service.
You have to press the center button until the blue lights flash quickly, when you pda finds the headphones, you will be asked for passkey. I don't know if it's necessary, but I entered 0000 and okay.
This took a couple of tries, but once paired, they work. I have not been able to get the next and previous buttons to work, but volume does. I suspect it is because I have not been able to update my BT stack past 1.5. Hope this helps.