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 Linphone - http://www.linphone.org/index.php/eng
 Speex - http://www.speex.org/
 Iperf - http://sourceforge.net/projects/iperf/?abmode=1
 Tcpdump - http://www.tcpdump.org/
 WaveCenter EMS Pro - http://www.apertonet.com/products/wavecenter.html
 ITU-T Rec. G.114, “One-way transmission time,” May 2000.