Dterm Series II will work on the 2000 with a specific card and worked on the Neax 1400 PBX and the Mark II Key system.
Note: The Dterm Series II have button problems after long use and they also have a problem with the ringer volume control.
Best bet,sell them on e-bay.
Key systems are the Mark II.
PBX's are the NEAX 1400 and NEC 2000IVS with a 2DLC line card.
These were replaced with the Dterm Series III and then by the Dterm Series E. Too many disadvantages to the Series II sets to mess with. Need module for Speakerphone, headsets, recorders, etc. Not much value in these sets.
Jerry Pannell
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