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Date: 2011-03-15 00:44:00Session Initiation Protocol Freeware VoIP phone ZRTP Gizmo5 Mobile VoIP VoIP User Voice over IP Computer-mediated communication Videotelephony | IEEE COMMUNICATIONS SURVEYS & TUTORIALS 1Add to Reading ListSource URL: www.cs.columbia.eduDownload Document from Source WebsiteFile Size: 352,01 KBShare Document on Facebook |