If you already have one in stock, you could just try it and see what happens. We have a customer with an 824 KSU working a Call Pilot 150 and after a year, it still runs flawless. Specs says it is not suppose to work properly.
If you're just using a Norstar voicemail as a plain vanilla system you often find it will work just fine in spite of the compatibility chart. If you get weird transfer problems then you definitely have a compatibility problem and the phone system software needs to be upgraded.
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