I have a Cisco 3550. I wanted to connect a 9971(used) to it, but it is not going beyond POST. I see the keys blinking but nothing happens after that, and this happens in a loop. Could that be a problem with Phone or with Switch?
Switch Information - C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(44)SE6
Model number: WS-C3550-24PWR-SMI