Thanks for the replies. I know that I will have to replace the 8X24 units, but the two main issues would be 1.) do all systems require the same software version (what about version release), and 2.) can I do this with only one T-1 in each system? If so then I suppose I would need the PRI enabler at each of the 4 locations?

Also, are the Startalk 2.0 and higher compatible with V7.0XC if I choose to do an interum step of replacing the 8X24 with MICS prior to networking? Marv, I looked at one of your posts with the compatibility matrix, but 7.0 was not on there. I saw where 6.1 was compatible.

Again thanks for the replies.