Hi Michael,
Here is a way of preventing users from seeing the Network config page. The downside is that this will impact other settings like Ring selection/volume etc if you choose Disabled so I might try Restricted;
Complete these steps:
From the Cisco CallManager Administration page, choose Device > Phone, and click the phone.
Choose Disabled for the Settings Access parameter under the Product Specific Configuration section.
When Settings Access is enabled, you can change the phone network configuration, ring type, and volume on the phone. When you disable Settings Access, the Settings button is completely disabled and no options appear when you press the button. Also, you cannot adjust the **ringer volume or save any volume settings. The option Restricted is available in Cisco CallManager version 4.1(3) and later. When you change Settings Access to Restricted, you can only access User Preferences and volume settings. By default, Settings Access is enabled.
From this doc;
http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00800a6763.shtml
Hope this helps!
Rob
