You need DR5 for a Flash to work with your 616. You won't have supervision, so I'd recommend upgrading to a CICS instead of upgrading software on your current system.
the supervision or "disconnect supervision"(ds) refers to the vmail detecting that someone has hung up and will drop the line
if your cabinet has on it " non-ds"
it can not detect this hangup properly and the line will lock on the vmail till it times out or is manually disconnected
the term cics is nortels short form for
Compact Integrated Communication System
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