A service to a user is prevented by providing, to the user, at least one communication link used to provide multiple services to the user. The plurality of services are activated over the at least one communication link. Transmission for the prevented service is prevented based on at least one characteristic...http://www.google.es/patents/US8144852?utm_source=gb-gplus-sharePatente US8144852 - Method and apparatus for spectral containment over telephone service lines
Method and apparatus for spectral containment over telephone service lines
