A system and a method for automatically routing Voice Over Internet Protocol (VoIP) calls made to an unavailable number to a directory assistance service for further assistance. An intercept system intercepts these erroneous VoIP calls and automatically routes them to a directory assistance service....http://www.google.com/patents/US7573993?utm_source=gb-gplus-sharePatent US7573993 - Method and system for providing directory assistance to erroneous telephone calls
