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Voice over IP (VoIP) NCAB Presentation 17-Jan-2001. Jeff Custard. VoIP—What is it?. Voice packets transported using IP Traditional networking infrastructure carries voice traffic Standards based (e.g., H.323, G.711, G.729, RTP, UDP, IP, RSVP). “Acronym Soup”. DYA-Define Your Acronyms!

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Voice over IP (VoIP)NCAB Presentation17-Jan-2001

Jeff Custard


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VoIP—What is it?

  • Voice packets transported using IP

  • Traditional networking infrastructure carries voice traffic

  • Standards based (e.g., H.323, G.711, G.729, RTP, UDP, IP, RSVP)


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“Acronym Soup”

  • DYA-Define Your Acronyms!

    • [see NETS “Projects page” info and articles or my “network acronym decoder” page at http://www.scd.ucar.edu/nets/intro/staff/jcustard/networkacronyms.htm]


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Buzz words

  • “Multiservice networking” and “Convergence”

    • Data, voice, and video on one infrastructure

    • The driving benefit (among the many touted) is reduced costs


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IP Telephony benefits:

  • Single wiring closet

  • Choice of phone power

  • Flexible IP address assignment

  • Easy adds, moves, and changes

  • Voice quality guarantees

  • Redundancy


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Quality of Service (QoS) issues

  • Have to deal with packet loss, jitter, and delay


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QoS issues, continued

  • At the edge of the network:

    • Additional bandwidth

    • cRTP

    • Queuing (WFQ, CQ, PQ, CB-WFQ)

    • Packet classification (IP Precendence, policy routing, RSVP, IP RTP Reservce, IP RTP Priority)

    • Shaping traffic flows and policing (GTS, FRTS, CAR)

    • Fragmentation (MCML PPP, FRF.12, MTU, IP MTU)

    • Jitter control on end routers


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QoS issues, continued

  • At the network backbone:

    • Packet over SONET

    • IP and ATM inter-working

    • WRED

    • DWFQ


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Powering the phones

  • 3 ways to deliver 48V to the phone:

    • “Inline power” (over the same cable used for Ethernet connection)

    • Powered patch panel inserted between existing switch and end devices

    • AC power adapter to wall socket

  • “Phone discovery” feature


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NETS VoIP Team & Resources

  • People: Scot Colburn, Jeff Custard, Teresa Shibao, Jim VanDyke

  • Equipment: IP Telephones, Cisco CallManager, Cisco 3640 routers (plus various voice-related interfaces), switches delivering inline power, and existing data outlets


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“The sandbox”

  • Initial testbed already deployed—we’ve gone through basic setup and component interaction

  • Full “test deployment” – within the next month (25 IP Phones; variety of system and user configurations)


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Project Goals

  • Learn about and test current VoIP technology

  • Determine viability of VoIP solutions for UCAR

  • Test interaction with current PBX and other “unified messaging” solutions


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Related Documents

  • Lots of information and additional links at:

    • http://www.scd.ucar.edu/nets/projects/voip/

  • Questions?


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