I am not a vendor. I am the new network admin for this company. THe upgrade was performed by our Avaya vendor. Hardware is as follows, Control Unit = IP406 V2 DS (fw v 4.1(12))
DS16 v2, firmware v6.1
Phone8 v2, fw v6.1
DS30 v2, fw v6.1
All desktop phones are 5410 or 5420. All phones were upgraded during the process as well. Please let me know anything else I can provide