Good morning fellowsI have a Cisco CGS 2520 saved and today I decided to use it again, but when I want to see and use the interfaces it shows me nothing and does not let me enter them, so I have located this error with a "show version": !!!! WARNING:...

Good afternoon colleagues.I'm starting in this world of voice, and I was wondering how to pass the IP phone model SPA500 with SCCP protocol to SIP protocol.Or how to configure a SPA502g phone in SIP to the CME (terminal).Greetings.