To answer Ed's question, AT&T gear that understood NI-1 and NI-2 was never the issue. It was AT&T's older "Custom" protocol that was a very minor hurdle for DMS. The old saw was to ask the switch guy to use NTNAPRI and set the sub-trunk L1 Flag to yes. My stuff would be optioned as DMS100.

"Carry others as you climb" -- Tim Alberstein