Which three Cisco Unified CallManager configuration steps are required to support third party SIP phones? (Choose three.)
A.
add the MAC address of the Cisco Unified CallManager server to the SIP phone configuration page
B.
configure the end user in Cisco Unified CallManager
C.
configure the phone with the TLS username and password
D.
associate the device with the end user
E.
change the proxy address in the SIP phone to an IP address or the Fully Qualified Domain Name (FQDN) of Cisco Unified CallManager
F.
configure the device in Cisco Unified CallManager