the communicationUS7646856Feb 19, 2003Jan 12, 2010At&T Intellectual Property I, L.P.Region-wide messaging system and methods including validation of transactionsUS7760860Oct 31, 2002Jul 20, 2010At&T Intellectual Property I, L.P.Methods and systems for enabling a reply call to a voice mail messageUS7933390Dec 21, 2007Apr 26, 2011At&T Intellectual Property I, L.P.Region-wide messaging system and met