Hi there Biv,
I had an interesting experience with a 1220 I bought from ebay.
It was loaded with some "other" type of SIP firmware from non Avaya/Nortel call server. The ringtones and features were completely foreign, and not quite as nice as the Nortel feature set ringtones, etc.
I spent about 3 hours trying to get this phone to work correctly.
I first had to find the foreign phone firmware's buried Network TFTP provisioning address. Finally found it, and downloaded the Nortel firmware. All is good, right?
NOT, my cfg and users.dat files were not being recognized by the TFTP server....mainly because I had the 2 cfg file naming conventions mixed up. I finally corrected that, but then the licensing was still telling me I had an active token, even though I am only using the basic SIP feature set. Finally after 2 factory resets, the phone magically loaded all the config and users.dat files and reset, came back up and said "no request" for the licensing, which means I can use it indefinitely with basic call features on VOIP.MS SIP trunking.
I am not too flattered by the display on the 1220's, it's quite cluttered compared to the 11xx sets, but I guess for $45, I can't complain!
Do you want me to post those files for you?