digital 30 on the system, and have had no issues, did an upgrade adding a second PRI card. First some of the phones were showing an A only on the display, support sent my guy a new folder with bin files for the release etc, now all then phones on the system are showing just an A on the display. I am guessing we need to re-upgrade to some intermediate release like a .999 release, I don't recall if it is 2.999, but I think that is what upgrades the phone files from the older release to the newer one.