A system and method for discriminating call content types for individual telephone lines at a plurality of user sites outside of a Public Switched Telephone Network (PSTN) is described. The system includes: a database containing security rules for each of a plurality of extensions, the rules specifying...http://www.google.de/patents/US6718024?utm_source=gb-gplus-sharePatent US6718024 - System and method to discriminate call content type
