Hi everyone, i have a customer that needs a SR upgrade of the 3 CallManagers Servers (1 Publisher and 2 Subscribers) and they have 95 remote office (15 ip phones by office aprox.) for a total of 1200 ip phones using a WAN link of 64K,128K and 256K. The upgrade of SR will make an upgrade of firmware to the ip phones. My question is: There is a way to make this upgrade of SR avoiding the firmware upgrade of the all IP Phones at the same time?, somebody has done this before?.
Thank you very much,