SOURCE: Norstar M7310 Phone's Buttons Don't Work At All
What system is this on? Sounds like the system is going downhill.
SOURCE: L1 Extension In Use
I had the same issue with TL76108. After trying to find the solution on the web, I called AT&T tech support: they tried to guide me to troubleshoot this issue. After some unsuccessful attempts, they advised me to return the phone where I bought it (luckuly I had the invoice and the original package) for exchange or refund. At Staples (that's where I bought the phone) I asked for exchange. As soon as I got home, I plugged in the phone and it started working perfectly.
So the solution for me was to return the defective phone and get a new one.
Hope this help.
SOURCE: Stop ringing at main phones when outside calls come in.
Here is a link to program line ringing.
It sounds like your extension is forwarded (confirmed by the one beep you hear on an incoming call.
From any display phone, press Feature 11
then enter your extension number 2 times. So if you are extension 20, do this:
Feature11-20-20
see if that does it.
SOURCE: some 816 phones won't ring on incoming calls
To change the ringing on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is).
with the handset down, enter #20 the screen should say MMC DISABLED
enter in 1 2 3 4 1 # (that enables programming)
enter in #62 the screen should say day ring assn
press the line you wish to program
press the buttons for the extensions that you wish to ring (the ones in the right next to the handset)
press # when finished with the line
repeat steps 2 through 5 for the remainder of the lines you wish to change
press # when finished.
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