I have been trying to get the RightFax open text 2100 to connect to cs1000m I have read several posts on this forum first try was old school with plain t-1 with em4. Appears you get not good documention from righfax . Had it working with ni2 and did internally but could work or answer but could not tandem calls from inbound isa route which had ncos of 1 and the niw route to RightFax ncos 4 getting swed equipment congestion message on isa d channel. Changed trunk route to ni2 tie then set dsel to 3vce can call into RightFax you can trace call shows established but never get ringback or the fax tone from system. Thanks