Is the 550 network PRI compatible with DMS250 switch type
DMS250I want to insert the ATLAS 550 between a Network PRI and original phone system utilizing that PRI so I can have a second CPE device share that network resource. I've done this a number of times, but I've run into a situation where the network PRI switch type appears to be DMS250 (according the original phone system). I tried using DMS100 switch type and that worked for the user term side PRI for the original phone system, but not for the Network side PRI to the LEC. I tried both DMS100 and National ISDN with all the different dialing conventions without any success.
I'm checking with the LEC on their specific config and options for changing it, but I could get old(er) and gray(er) waiting on them, not to mention the $$$$ they'll probably request for a few keystrokes.
Any suggestions/experience with DMS250 PRI compatibility options?