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  • Signaling Analysis Examples: Is QoS enabled properly? *on isolated VoIP network, need to ensure that media is taking higher priority than control *on converged VoIP network, need to ensure that media is taking higher priority than all other packets Are you getting dial-tone When you transfer, where is it going Caller id enabled? Call directory Outlook integration
  • Simple Answer: Make the Network Smarter You can’t fix what you can’t see and you can optimize what you can’t measure! Capture - See all the information From source to destination (end to end) Analyze - Understand the information Examine and Interpret it at the source Visualize – Measure and compare to baselines Adaptive learning and improving over time Optimize – Alert , Recommend, Respond Actions as automated as policy allows Improves every layer above the data packet Security: locate breaches and isolate virus-infected systems Application: content and context interpretation with source Prevents “brown outs”, false-positives and finger pointing Speeds Troubleshooting and resolution

Transcript

  • 1. Deploying & Maintaining VoIP A WildPackets Web Seminar 11 am PDT August 3, 2006 Toll free: +1 (800) 373-0950   Toll: +1 (719) 785-4460   Participant code: 833800
  • 2. Agenda
    • Introduction
    • Quick Poll
    • VoIP Trends
    • VoIP Analysis Best Practices
    • The OmniAnalysis Solution
    • Q&A
  • 3. Trends
    • As networks stabilize, everything is moving to the network
      • Telephony
      • Video
      • Web services (and further business automation)
    • The perimeter is gone; 24/7 access is assumed
    • Small, medium, and large companies are all facing challenges
      • 110,000 SMBs in the US expected to deploy VoIP this year
    • Growing emphasis on applications
      • Application performance -> productivity
      • Application security -> SOX compliance, GLB, HIPAA, etc.
  • 4. The Rush to VoIP
    • IP phone systems as a percentage of total business telephone equipment sales:
      • 1.4% (1999)
      • 56% (2003)
      • 97% (2007) (Gartner)
    • Worldwide corporate telephone lines using VoIP will grow from 4% to 44% by 2008. (Radicati Group)
    • Enterprise spending on IP phone systems in North America will double, reaching $4.2 billion in 2007 (Gartner Dataquest)
    • 130,000 SMBs have already adopted VoIP; another 110,000 SMBs will do adopt VoIP this year. (AMI Partners)
    • Conclusion: Businesses are relying on VoIP, so they need VoIP analysis and troubleshooting
  • 5. So What’s the Problem?
    • Unlike traditional data protocols, VoIP is sensitive to delays, burstiness, and jitter as it passes through the network
    • Dropped packets in a media stream are not recovered
    • Jitter buffer drops late packets
    • Distance can affect quality – “mouth to ear time”
    • Codecs can matter - G.711 (64 Kbps) is generally of better quality than G.729 (8 Kbps) but requires more bandwidth (approximately 80 Kbps per user)
    • Best VoIP is a nice steady delivery of packets – Typically every 20 ms for typical G.711 call, if not, we have “jitter”
    Some issues are signaling and some are media OmniAnalysis allows us to see all VoIP problems
  • 6. VoIP Analysis Best Practices
  • 7. Speech Quality Measurement Terms MOS R-Factor PESQ PAMS E-Model
  • 8. MOS and E-Model
    • Mean Opinion Score (MOS)
      • Subjective MOS -Listening speech quality calculated by a "Subjective Test" according to ITU Recommendation P.800
      • Objective MOS - Measured listening speech quality, typically a comparison rating method
      • Predicted MOS - Estimated conversational quality
    • The E-Model - Recommendation ITU G.107
      • The "E-Model" is a parameter based algorithm based on subjective test results of auditory tests done in the past compared with current “system parameters”
      • Provides a prediction of the expected quality, as perceived by the user
      • The result of the E-Model calculation is “ E-Model Rating R ” (0 - 100) which can be transformed to “ Predicted MOS (PMOS) ” (1 – 5; 5 is non-extended, non-compressed)
    OmniPeek Voice Computes the R-Factor and PMOS
  • 9. Crunching the Voice Score OmniPeek does the hard part… … so you can see the bottom line Source: ITU Recommendation G.108 – E-Model Guidelines
  • 10. Jitter
    • Jitter is the variance in packet delivery intervals to the listener
    • Jitter buffer adds additional delay to voice reaching the ear piece in case other packets need to catch up
    • Packets delayed too long in the network are not allowed to enter the jitter buffer
    Packets delayed more than the buffer delay (100 ms as an example) are dropped . . .. .. . . ........ ...... Packets are buffered and delayed at the Receiver The “jitter” buffer releases a G.711 packet every 20 ms A G.711 packet sent every 20 ms Packet jitter and drops 3 1 2 4
  • 11. Voice Quality and Jitter Analysis HQ user IP Remote user IP … note the decrease in quality at the other end Let’s replay the VoIP call at different jitter buffer settings The call goes through the network and…
  • 12. Real Time Diagnosis of ALL Application Flows
  • 13. OmniPeek Provides Total Coverage
    • Monitor SIP and H.323 signaling failures to gateways, call manager, or peer-to-peer
    • Monitor early indicators of voice problems – jitter, late packet arrival, dropped packets
    • Jitter problems analyzed both at the device level via RTCP report packets from that device (VoIP handsets, softphones, PSTN gateways, etc.) and at the stream level anywhere that the VoIP stream is captured in the network
    Analysis of VoIP near the end-points is the most effective Remote Office HQ Engineer
  • 14. OmniPeek In-Depth VoIP Analytics
  • 15. VoIP Deployment and Management
    • Pre-deployment Assessment
      • What is the network utilization before the addition of VoIP?
      • How is application response time?
      • Baseline
    • Deployment
      • Is QoS properly configured?
      • Converged or Isolated VoIP network?
      • Testing features and call quality
    • Maintenance
      • Monitoring features and call quality
      • Evaluating infrastructure enhancements
      • Troubleshooting service failures
  • 16. The OmniAnalysis Solution
  • 17. Comprehensive “per-call” VoIP Analytics Call View Media Plane Signaling Plane
  • 18. Software-only Solution
    • Eliminates expensive hardware to provide complete portability at significantly lower cost
    • affordability  procure more for budget  increased availability  faster find-to-fix time
  • 19. Unified Solution for VoIP and Network Analysis Complete Expert + VoIP Analysis Solution
  • 20. Rich Set of Analytics
  • 21. Integrated VoIP Experts
  • 22. Set Expert Events to Meet Your Needs
  • 23. WildPackets Vision: Make the Network Smarter And Do It All In Real Time !
    • The OmniAnalysis Platform makes network analysis “omnipresent”
      • Capture - See All the Information
      • Analyze - Understand the Information
      • Visualize – Measure and Compare to Baseline
      • Optimize – Alert , Recommend, Respond
    • Improve Every Network Layer, including…
      • Security: Locate Breaches and Isolate virus-infected systems
      • Application: Content and Context Interpretation with Source
    • Speed Troubleshooting and Resolution
    You Can’t Fix What you Can’t See and You Can’t Optimize What You Can’t Measure!
  • 24. WildPackets OmniAnalysis: Edge to Core
  • 25. What Sets WildPackets Apart? How do we make you network smarter?
    • Innovation and industry leadership
    • Award-winning products and services
      • Ease-of-Use
        • Single click to make filters, select packets, create alarms, etc.
        • High-level overviews and simple drill-down details
      • Real-time capabilities
      • Unique “Expert” intelligence
      • Extensible architecture
      • Multiple NIC support providing multiple simultaneous captures
      • Peer map and Visual Expert for instant network visualization
    • Delivered value - “Making Networks Smarter”
    • Partnerships
    • Collaborative
      • Share trace files for expert analysis and voice play-back
      • Multiple views into same engine for collaborative troubleshooting
  • 26. Thank You! Want more information? www.wildpackets.com (925) 937-3200 Other Web seminars: www.wildpackets.com/smarter