In one aspect, instant messaging and other forms of communications, such as push-to-talk voice...http://www.google.com/patents/US20040254998?utm_source=gb-gplus-sharePatent US20040254998 - When-free messagingAdvanced Patent SearchPublication numberUS20040254998 A1Publication typeApplicationApplication numberUS 10/882,009Publication dateDec 16, 2004Filing dateJun 30, 2004Priority dateJun 17, 2000Al