The unknown card is an NTDIU card that simulates 4- 7324 sets.
The feature 990 is a locked function that comes from that card.
If you are upgrading the Phone system you may have to replace the NTDIU boards. The newer phone systems and older NTDIU boards have static when talking to voicemail...
Some hackers are brave enough to call into the company's
office and state they are with the phone company testing lines and ask to be transfered to extension 90.
On a PRI system this will give the outside caller an outside operator to dial anywhere.
Train the staff not to transfer anyone to a...
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