Your System Administrator would be happy to tell you what kind of radios are compatible with the system. That being said, the used to use MTS2000 series radios - but the upgrade to XTS 5000s is a small hint that they are planning on going to 9600 P25 (IMBE) in the near future, which they are
Near future is currently defined as years. There are no immediate plans to upgrade the city system to P25 as the funds just aren't there. They're upgrading to XTS5000s for the interoperability aspect, and most of the ones they have are not currently digital capable. The only units with digital capable radios right now are command-level persons as well as specialized units like the bomb squad. There's also a cache of digital capable radios on the CERV.
Many of the suburbs, in fact, are still loaded with MTS portables and MCS mobiles, with the only digital radios in the hands of the chief and another supervisor (and most of those were handed out through a federal interoperability grant). The Columbus Regional Airport Authority is one of the few agencies I can think of off the top of my head where all front-line first responders are equipped with digital-capable radios.