I haven't worked on anything Telrad since the late '80s, but just a thought...
If '809' is the trunk number, is this a system code? I remember the Nitsuko DS01 had trunk numbers (801=line 1, 802=line 2, etc etc.) that if dialed would access that line directly.
In that case are there any mailboxes in the 8xx range (like 809)? Or any whos dial string could possibly access an outside line?
