The TDA/NCP system time is changed from the phone allowed programming. It can be one or all, but the main phone (ext 101) can do it. When you find the one that works, press PROGRAM **1234 If it doesn't work, then you don't have the right phone. When it says Sys Pgn No? dial 000.
Then use the NEXT, keypad, and ENTER keys to change your time.
Just pick up the handset and drop it back down to exit programming
Carl
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