Voyager 510 - Connected but no sound.

I have a Plantronic Voyager 510 paired with a Sanyo Katana. All was
working fine, except for the odd disconnection now and then. Then I
installed an IOGEAR GBU221 Bluetooth Wireless USB adapter to my
computer in order to be able to use my Voyager 510 headset for
chatting on the computer. I was able to pair it fine.

Problem now is that when i tried using my cellphone and headset, it
connects, i get the green icon showing it is connected... and i can
hear the beep in the headset indicating it connected... but the sound
still comes thru the handset and NOT the headset. The cellphone is
programmed to connect to the headset first "Hands-Free mode".

I tried deleting the device and re-detecting it and all seems to go
smoothly. But the end result is the same. Why will it not connect
properly since i paired it with the computer? I disabled and even
took out the IOGEAR adapter in case it was trying to connect to the
wrong device but that didn't help either.