The present invention discusses a method and apparatus for providing customer information, such as a physical address etc., to a call destination, such as a Public Safety Answering Point (PSAP), over an Internet Protocol (IP) communication link. A mediation layer maintains a table tracking information...http://www.google.fr/patents/US7336968?utm_source=gb-gplus-shareBrevet US7336968 - IPT X11 mediation layer and process
