A telecommunication system enables a called party having a caller identification device to learn the identity of a calling party although the calling party is a credit card caller, a calling card caller, a caller using an Intelligent/Agent service, a caller using a pager or a caller connected to a PBX...http://www.google.com.hk/patents/US6996220?utm_source=gb-gplus-share專利 US6996220 - Method and apparatus for forwarding caller identification for a credit card or calling card call to an automatic number identification system of a telephone network
