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Voice over IP (VoIP) NCAB Presentation 17-Jan-2001

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 Presentation 17-Jan-2001

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  1. Voice over IP (VoIP)NCAB Presentation17-Jan-2001 Jeff Custard

  2. 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)

  3. “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]

  4. Buzz words • “Multiservice networking” and “Convergence” • Data, voice, and video on one infrastructure • The driving benefit (among the many touted) is reduced costs

  5. IP Telephony benefits: • Single wiring closet • Choice of phone power • Flexible IP address assignment • Easy adds, moves, and changes • Voice quality guarantees • Redundancy

  6. Quality of Service (QoS) issues • Have to deal with packet loss, jitter, and delay

  7. 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

  8. QoS issues, continued • At the network backbone: • Packet over SONET • IP and ATM inter-working • WRED • DWFQ

  9. 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

  10. 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

  11. “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)

  12. 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

  13. Related Documents • Lots of information and additional links at: • http://www.scd.ucar.edu/nets/projects/voip/ • Questions?

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