Access control is a security technique that can be used to regulate who or what can view or use resources in a computing environment.
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For IWATSU/Icon Voice Networks, lift your handset (from any phone), press 71, then press pound, enter 201, enter passcode (if prompted), press 4 for Admin, press 5 for Time, enter time in a 24-hour format (i.e. 1:31 PM = 13:31). DON'T FORGET TO CHANGE YOUR TELEPHONE SYSTEM TIME!