What would cause a M3904 telephone to dial a certain extension no matter what digit is pressed? As soon as the first digit is pressed, it dials a certain number.
I had a phone do that once and it was the Green key sticking. If you have Last Number Redial allowed (LNA) it will dial the last number automatically if you have Live Dial Pad active in the phone options.
So as soon as the user would push a button it was dialing out the last number.
See if turning off the Live Dial Pad or LND stops it, either way the phone has problems.
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