Nope. The Ellisville site is one of the original MSWIN Phase 1 sites built in the first part of the buildout. Phase 1 was South MS. Phase 2 was Central MS. Phase 3 was North MS. The Jones County site is newer in the conversion phase when may are converting their older Motorola or EDACS TRS's over to MSWIN sites as Counties/Municipalities add their own systems for coverage etc. Others that have converted include Forrest County, Lee County, Madison County, City of Madison (Madison withdrew its site from the Hinds TRS, and converted it to MSWIN) and now Rankin County. Others that have signed MOU's and have stated they will be converting include Warren County, DeSoto County, Harrison County (Going to convert its EDACS over). Also eyeing the possibility of conversion are Washington County, and Tunica County. Its an good bet that Hinds County will also as now an second Municipality there (Clinton) is going MSWIN, and an new site being built there.
Conversion is also actually cheaper in the long run to do rather than build out an stand alone P25, as Motorola is discontinuing support of the Smart Net, and Smart Zone type of systems, and Harris is discontinuing support for EDACS thus everyone upgrading to P25. Two notable oddballs being City of Jackson (upgraded its EDACS to an Harris P25ip), and MSU/Oktibbeha County (also upgraded EDACS to P25ip). Also MBCI is building its own P25 TRS covering multiple counties in its reservation complex.
Unknown at this time if MDOC, and Noxubee County will convert their EDACS's over to MSWIN or upgrade to P25ip.