Jared,
I had the same issue and suprisingly, the answer is in the web admin manual of the 7925g. It has to be changed in the call manager once you sync up to it. Below are the steps. Hope it helps you.
Rich
Setting Configuration Privileges for the Phone Web Page
To make changes to the phone by using the web page, you must use Cisco Unified Communications Manager Administration to enable Web Access and Phone Book Web Access.
To allow configuration privileges, follow these steps:
Procedure
Step 1 
Log into Cisco Unified Communications Manager Administration.
Step 2 Search for the phone in Cisco Unified Communications Manager Administration by choosing Device > Phone and enter search information such as the DN.
Step 3 Click on the DN of the phone that you want to set the privileges.
Step 4 Open the Phone Configuration window, scroll down to Product Specific Configuration Layout, and enable these privileges:
•In the Web Access field, select Full from the drop-down menu.
•In the Phone Book Web Access field, select Allow Admin.
Step 5 Click Save to make the change.
Step 6 You must reset the phone to enable configuration privileges on the web pages for this phone.
