"Nortel T7316E system"
T7316e is a phone not a system.
You should find out what system you have.


"Changed the VM remotely, now I get a high pitch- (fax-signal)"
Changed what part of VM?
What steps did you do to do what?

"or get into the VM using *9 or #5"
Those codes do not sound familiar.

Are you a user or the administrator?
Sounds like you might need a tech on site.


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