I bought this phone on eBay, and when I plugged it in, the Avaya SIP firmware came up on it along with a login for an Ohio State University SIP line. It appears by their website, OSU is still a Nortel Genband Centrex campus. This SIP phone must have been a test phone. I converted the software back to Unistim firmware for use on a UCx platform from E-Metrotel.
Screenshot showing OSU is still a Nortel campus.
The login screen on the 1140E: