Have a customer who cannot change their system time/date from attendant phones. Have verified the phones they are attempting to use are programmed as attendants however when using the code to change the time/date the display simply returns to an idle condition. I can change time/date using VMMI. The manual says to use "01" to change the time/date and for example use "02" for system speed dial. On this customers phone "01" does nothing and "02" comes up LCD Messaging. Can these codes be changed? Under Feature Number programming I see the code for attendant programming which is default.