Territorial boundaries and the assignment of responsive telephone numbers are prescribed for a virtual telephone number. Telephone calls placed to that number, even though the territories are within a metropolitan or other relatively local area, are automatically routed to actual telephone numbers so...http://www.google.es/patents/US6163597?utm_source=gb-gplus-sharePatente US6163597 - Method and apparatus for routing calls placed to a virtual telephone number
Method and apparatus for routing calls placed to a virtual telephone number
