Calling line identification permits the individual receiving the call to see the caller’s number. This covers caller ID shows as well as the 1471 service. it permits the caller to see the number of the individual responding to the phone. Caller ID data normally comprises the caller’s telephone number while CNAM comprises the caller’s name. A modem can pass CLID data to a computer for purposes of call logging or blocking, but modems in various countries have various frameworks, causing hardware or software incompatibilities.