If you are using MGCP it is supported to have configured Facility IE or Display IE, if you
are using H.323 you can only use Display IE.
Also in CallManager in the GW configuration you need to have the box enable about this
settings. Then set the caller name on the phone.
This is all that is needed from the CCM side, everything else needs to be from the telco, if you are sending the caller name the telco needs to accept it, you can use a debug isdn q931 to see what the GW is seeing, if in the debug you see a sequence of hexadecimal numbers as the information
element of the name then it is configured as Facility IE, if you see the name then you are using Display IE.