How to Configure a 7921 WIFI Phone with the UC520

I found a great white paper on Cisco's site for configuring the 7921 with the integrated wi-fi in the UC520.
It is Titled :
7921 Phones in SBCS Environment Configuration Guide
and is available at this link
http://www.cisco.com/en/US/products/ps7320/products_white_paper09186a008...

Also here is a link on how to configure the Push to Talk feature on the 7921
http://www.uc500.com/configuring-push-talk-cisco-7921-ip-phone-cme-or-uc520