I would replace it with a newer model. I am not sure if the DR2 software supports T series phones (but I think it does), but look at it this way: If you can upgrade to a newer software to support the new telephones then that is noce. BUT, the phones are the cheaper part of the equation, that system is from '91 - it is 18 years old, it could die and then your software upgrade would have been for nothing.
If I were you I would spend the money to buy a new cabinet and keep the telephones. Then when the phones start to die you can replace them, but your system is still alive and running great. You have an assortment of options depending on your size. You could have an MICS, CICS, or BCM 50. BCM is the newest model and the most likely to stick around...but there are plenty of parts available for MICS and CICS.
Steve
