I don't know what programming is already in place, so it's difficult to say whether additional translations are necessary. I've got a rock-solid cheat sheet that I can send you along with a note or two about DID if you'd like.

Technically, the Legend supports "AT&T Custom" protocol only. In my mind, Custom or 5ESS protocol is distinctly different from NI1 or NI2. National ISDN was developed and standardized by Bellcore, while AT&T had other ideas. There was a time when 5ESS protocol was king, but NI2 has long since been favored.

Anyway, I've noticed that a lot of carriers these days use the term "NI1" to mean either AT&T Custom or NI1, which I find misleading. Ask your carrier if 5ESS or Custom protocol is supported.

If the number of digits sent by the carrier matches your dialplan, then it's a cinch. If they don't, you have to build entries in your Route By Dialplan table to add, remove or substitute digits in order to manipulate what is being sent.

"Press play and record at the same time" -- Tim Alberstein