Stix1 is right. Instead of upgrading each system to a now non supported CPC you should just contact your local Mitel dealer and get get the migration program to the MiVoice Office (formerly Mitel 5000 Communications Platform) which delivers a hybrid digital / IP communications platform that enable small and medium sized businesses to blend their voice system into their data network, creating a cost-effective, efficient communications environment. As of today the old legacy Inter-tel phones are still supported so you may keep your phones.

Inter-tel Axxess, Mitel CS/HX5000, MiVoice Office CCS/CSM, VPU, EM, ATM4, A+, CTP+, NET+, OAISYS, Audicodes, Polycom, Spectralink, NEC Red, Samsung, Mitel Call Recording, Mitel MBG, MiVoice Office, Xarios. Mitel Phone Manager