How to find Bluetooth device type

Hi,
I recently started working on Bluetooth. I write a c program to search
nearby bluetooth devices.
In search output, I get different types of bluetooth devices e.g. mobile
phones, laptops.
I want to display only mobile phones's bdaddress.
Where do I get this information form blueZ stack. In which structure the
device type is store.

I am working on Ubuntu-10.4 and using blueZ-4.94.

Thank you in advance.
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