We just installed a new system CM5.2, with a Call Center at the main site and and LSP with a Call Center at a remote site. We are using the 1608 sets, and have been having complaints of the sets locking up. The agent will answer a call, and the buttons (transfer, conference, hold, ect..) will not work. Unplugging the phone and letting reboot seems to temporarily fix the problem. I have seen other posts stating to update firmware. We are at 1.22, which appears to be the latest. We have been working with Avaya to fix the problem, but no solution yet. They rebooted all of our sets last night, and the problem seems to have increased. Anybody else have the same problem and find a fix?