If he has a 7100t, here what you can do. Press the "send" key to get to the phone screen. Then click the trackwheel and select "options." From the options screen there, select the "Call Forwarding" heading. Once there click the "Forward all calls" option and make sure it says "Do Not Forward" underneath. That should do what you're looking for. If so, glad to help, if not, oops...
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