No sound on headset even though it has been... (by 2 users)

I bought an H350 headset and worked fine with my Treo for about 6 weeks until a couple of days ago when, all of the sudden stop working. The problem is that even though it is appropriately paired I get no sound out of it when I make or receive a call. The funny thing is that I can answer and end a call by taping on the headset button but the sound comes out always from the phone.

I have deleted the device from the phone’s trusted list and re-pair it several times with no luck. I have also reseted the phone. This will not solve it either.

I paired the head set to a Sony Ericsson phone and got the same result.

Any help would be appreciated.

- I lost my proof of purchase