The T's should work for sure because they run on SLMO ports like optisets. I think you have to run them in Device Family of Optiset though. STMI I think has been around since V2, but there might be some issues with hardware and software versions of your phones - in the software release notes for HFA it will state what hardware/software levels you need to have and minimum switch releases I believe. If you know what release your HFA phones are at you should try to get the release notes for that version and look at the compatability information.
Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA