SS7 was originally designed for operator management on the assumption that anyone connected to the SS7 network was trustable. In the current network environment, however, there appear more and more untrusted devices (including the PABX, call centre and VoIP access system) that interconnect to PLMN/PSTN. As a result, calling line identification spoofing is particularly effective at defeating call blockers, thus leading to a variety of scams by avoiding identification. The goal of this document is to identify the signalling requirements of calling line identification authentication including codes and signalling procedure base on the mechanism defined in the Q.3057.