In some of our facilities, I'm able to see the AP name in my survey tool of my 792x phone. Yet in others, I only see the MAC address. Am I missing a WLC configuration somewhere that allows this to appear on my phone?
Define "others"? The Site Survey tool of the 7921/7925 is limited to the SSID the phones are configured to go. If you, for example, use the 7921/7925 tool to survey the local supermarket they won't see it unless the SSID they were configured are not there.