The system is P25 Phase II as indicated by anyone that takes a look at the labels on the boxes that are stacked up in the pictures that clearly say P25 Trunking.
Rather than attempting to reply to comments that simply say "Harris sucks", I will simply say that I have been using P5100's, P7100's, P7300's, P5500s, Orions, M7100s, M7300s, XG-75ps and Unity portables for several years on four separate EDACS systems as well as on P25 Trunked systems. I have never had any significant issues with any of them.
While the XG-25 wouldn't be my choice for a fire service portable (we spec the XG-75p for fire service), I do have several XG-25p and XG-25m units on order that I anticipate accepting delivery of in the next few weeks.
As for infrastructure, you can say what you will about OpenSky however I will take a Mastr II, Mastr III or Mastr V over any other base station any day of the week. The Mastr II and Mastr III are some of the most solid and longest running base stations ever built. There are still plenty of 30+ year old Mastr II radios carrying systems around the country.