If this is a used set, you may want to set it to the defaults, as there may be a VLAN set up that you did not see. Press * when prompted to program, cycle through all the settings, but don't make any changes. Go all the way through and restart the phone with no changes. The screen will go blank and before it resets, it gives you about 5-10 seconds to enter in some codes. At this point, press MUTE RESET (73738) #,#,#. Hope this helps as I have ran into this hundreds of times....
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