SOURCE: I have a 6x16 Norstar
This is often caused by a power outage? what you need to do is reset the main phone controller. perhaps even reprogram it?
This may actually be a job for the telecoms techs actually if you cannot clear this by yourself.
techsupport.svots.edu/telephone/m7324.pdf
Above is your manual, have a look in there for what to do.
these are the Phone Systems.NT8B40AE NT8B40BB.that are often used. if you need a manual for that.
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