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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 Presentation 17-Jan-2001


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voip what is it
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
“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]
buzz words
Buzz words
  • “Multiservice networking” and “Convergence”
    • Data, voice, and video on one infrastructure
    • The driving benefit (among the many touted) is reduced costs
ip telephony benefits
IP Telephony benefits:
  • Single wiring closet
  • Choice of phone power
  • Flexible IP address assignment
  • Easy adds, moves, and changes
  • Voice quality guarantees
  • Redundancy
quality of service qos issues
Quality of Service (QoS) issues
  • Have to deal with packet loss, jitter, and delay
qos issues continued
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
qos issues continued1
QoS issues, continued
  • At the network backbone:
    • Packet over SONET
    • IP and ATM inter-working
    • WRED
    • DWFQ
powering the phones
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
nets voip team resources
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
the sandbox
“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)
project goals
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
related documents
Related Documents
  • Lots of information and additional links at:
    • http://www.scd.ucar.edu/nets/projects/voip/
  • Questions?