I have configured CME + CUBE + SIP Trunk (Telco)Customer uses 8861 SIP IP PhonesIOS ver: isr4300-universalk9.17.03.04a.SPA.bin As per ITSP/Telco requirements, below commands must be turned off:no ip http serverno ip http secure-serverno ip nat servic...

Understood CUCM and CUCM SME is very similar except CUCM SME wont be used for phone registrations and used mainly for call routing between clusters or various devices as per below discussion link: https://community.cisco.com/t5/ip-telephony-and-phone...