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

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Voice over IP (VoIP)NCAB Presentation17-Jan-200
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• Jeff Custard

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VoIPWhat 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 deployedweve 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?