In one aspect, instant messaging and other forms of communications, such as push-to-talk voice...http://www.google.com/patents/US8086672?utm_source=gb-gplus-sharePatent US8086672 - When-free messagingAdvanced Patent SearchPublication numberUS8086672 B2Publication typeGrantApplication numberUS 10/882,009Publication dateDec 27, 2011Filing dateJun 30, 2004Priority dateJun 17, 2000Also published asCA2