Hi Patricio,
The example shows how to disable the settings Access enable/disable;
settingsAccess {0 | 1 | 2}
Enables and disables the Settings button on an IP phone (Default is Enabled).
0 - Disabled.
1 - Enabled (default). Phone user can modify features by using the Settings menu.
2 - Restricted. Phone user is allowed to access User Preferences and volume settings only.
Can you try ?
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Router(config-ephone-template)# service phone settingsAccess 0
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Router(config-ephone-template)# exit
Router(config)# ephone 15
Router(config-ephone)# ephone-template 8
Router(config-ephone)# exit
Router(config)# telephony-service
Router(config-telephony)# create cnf-files
Router(config-telephony)# exit
Router(config)# ephone 15
Router(config-ephone)# reset
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_command_reference_chapter09186a008061137f.html#wp1123331
Hope this helps!
Rob