DHCP vendor ID

Hello

I need Polycom phones to be given a specific set of IPs. There are approximate 100 phones.

I have searched(to start). The nearest one (using 2008 server) is

http://social.technet.microsoft.com/Forums/en-US/winservergen/thread/b50761ca-116c-4be9-b3a6-9eb4f804671a

There is no clear thread which defines how to use Vendor ID and then link it to specific scope. We are using 2008 R2.

To start with, typical of Poycom, I dont know what the vendor ID looks like(conflicting info everywhere). We have mix of Polycom lot - So just need a specific string(binary) to identify its poycom.

Does MS DHCP work in a way so that anything 0004fxxxxx (This is polycom mac) is identified and put in separate scope? Why even Vendor ID thing comes into play when we all know that MAC addresses identify the company.