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Netergy - Stanford - VoIP A Show-and-Tell After the First 12 Month Niko Färber, Yi Liang, Mack Hashemi Bernd Girod, Balaji Prabhakar
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Nikolaus FärberNetergy – Stanford - VoIP Growth in VoIP Traffic VoIP is one of the fastest-growing technologies in communications 900% 1998-1999 5000% 1999-2004 2004 1999 1998 135 billion minutes 2.7 billion minutes 310 million minutes Source: IEEE Spectrum, May 2000
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Nikolaus FärberNetergy – Stanford - VoIP Scenario Legacy LANs often do not support priority queuing mechanisms DiffServ in Internet backbone is still evolving WAN R S... Host VoIP has to deal with best-effort service of IP LAN IP Phone T2 Use Netergy’s Audacity T2 as platform for VoIP deployment
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Nikolaus FärberNetergy – Stanford - VoIP Netergy Networks’ Audacity T2 Highly integrated OEM solution Single chip, minimal extension components Two Ethernet ports Local PC Network Audio functionality G.711, G.72x Echo cancellation Comfort noise VoIP software stacks H.323 MGCP SIP Source: www.netergynet.com
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Nikolaus FärberNetergy – Stanford - VoIP Networked Multimedia Signal Processing Improve tolerance to delay variations and loss Adaptive playout Loss concealment best-effort VoIP Make Application Network friendly Make Network Application friendly Networking Control traffic on LAN to reduce delay variations and loss Reduced TCP window size exploit interactions, strength, weaknesses
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Nikolaus FärberNetergy – Stanford - VoIP Agenda 10:30 Welcome 10:45 Niko Färber Reduced TCP Window Size for VoIP in Legacy LAN Environments 11:30 Yi Liang Adaptive Playout Scheduling Using Time-Scale Modification 12:30 Lunch at Faculty Club 13:30 Mack Hashemi Netergy Network’s Perspective, Open Issues, and Future Work 14:30 End
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