This is not a "Norstar product" as Norstar had their own digital version made by the same company.
Here is all I can see:
https://www.manualslib.com/manual/1314435/Algo-3006.html
Posting in the General forum might get you a downloadable version if somebody has since this version is made for other systems.
Since it's a CICS you may want to get a Norstar Door Phone.
-It connects to a digital port
-When you answer the call a softkey "Open" will appear.
-You can tell it what DN or HG to ring, get special page chimes and ring counts.