The present invention relates to a method for providing an arbitrary sound chosen by a called subscriber for a caller instead of a conventional RBT (RingBack Tone). The present method comprises: the first step, conducted by an HLR (Home Location Register), of furnishing a call-originating exchanger with...http://www.google.ca/patents/US20060098801?utm_source=gb-gplus-sharePatent US20060098801 - Method for providing a subscriber-based ringback tone sound
