Actively Managing Multimedia Telchemy Actively Managing Multimedia

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1 Actively Managing Multimedia VoIP Fault and Performance Management Alan Clark, CEO Incorporated

About Leading provider of core technology for VoIP fault and performance management mon used for SLA monitoring, VoIP Probes/ Analyzers, VoIP performance management Leading

2 About Leading provider of core technology for VoIP fault and performance management mon used for SLA monitoring, VoIP Probes/ Analyzers, VoIP performance management Leading development of VoIP performance management standards.. RTCP XR. Leading development of innovative tools, ideas, techniques for managing real time applications..

3 Outline VoIP Performance problems VoIP Performance Management Framework RTCP XR Metrics explained Application Examples

4 What s the problem? basic scenario Packet discard, Jitter buffer delay, CODEC distortion Echo, Signal level Noise level IP Phone Media path IP Gateway Packet loss, jitter, delay, transient IP problems

5 What s the problem? Secure RTP Security can make management difficult IP Phone Secure RTP IP Gateway Probe/ Analyzer can t decode voice payloads to see signal/noise/echo

6 First solution step RTCP XR System RTCP XR RFC media path reporting protocol - exchange information between endpoints - measure at/near user interface - metrics optimized for VoIP - make use of existing data from DSP IP Phone Media path IP Gateway ITU G TS Annex E RTCP XR ITU G TS Annex E Probe/ Analyzer for midstream measurements and problem diagnosis can use RTCP XR data

7 Second step signaling based reporting Call Server Report the same metrics back to call management systems.. CDRs IP Phone SIP - draft H approved MGCP - tbd Megaco - approved RTCP XR ITU G TS Annex E

8 Complete Solution Management Framework Call Server NMS/ SMS IP Phone SIP H.323 MGCP Megaco SNMP + RTCP XR MIB IP Gateway RTCP XR New! G ITU G TS Annex E Probe/ Analyzer

9 RTCP XR VoIP Performance Metrics Call Quality MOS-LQ, MOS-CQ, R-CQ External R Factor IP Problems Delay Problems Signal/ Noise Problems Echo Problems Configuration Problems Loss rate Discard rate Burst length Burst density Packet path delay End system delay Signal level Noise level Echo level Round trip delay Jitter buffer configuration PLC type End system delay Gap length Gap density

10 ITU G.107 (E Model) and RTCP XR Noise, SLR Ro SLR, RLR -Is R-LQ MOS-LQ Annex E -Ie Delay, Echo -Id R-CQ MOS-CQ Advantage Factor + A RTCP XR Call Quality Metrics

11 Annex E Burst Packet Loss Model Typically 20-40% loss rate Gap Burst

12 Annex E Perceptual Model Burst loss rate Perceptual model Is Ie mapping Ie Gap loss rate Ie mapping Recency model Id TS Annex E G.107

13 Annex E improves accuracy Es tim ated MOS G Annex E G.107 only Time Varying Packet Loss Subjectively Measured MOS G.107 G Annex Annex E E -- Correlation Correlation 0.84, 0.84, Mean Mean error error A+ A+ G.107 G.107 only only --Correlation Correlation 0.71, 0.71, Mean Mean error error C- C-

14 Applications - Enterprise IP Phones with embedded monitoring Probe/ Analyzer IP Phones with embedded monitoring Branch Office RTCP XR reporting RTCP XR reporting IP phone Network Management System Gateway PSTN Teleworker Central Location Embedded Voice Quality Monitoring with mon

15 Applications - IP Centrex IP Network Aggregation Router T1 Access Integrated Access Gateway with embedded monitoring IP Phones with embedded monitoring TDM Probe Real Time QoS Reporting with RTCP XR Trunking Gateway Business Customer Site Network Operations Center Embedded Voice Quality Monitoring with mon Service Provider Network

16 Key Message VoIP performance management framework Consistent set of VoIP metrics, based on RTCP XR Media path and signaling protocol based reporting Distributed model Ability to monitor every desktop, every home, every demarcation point Provides end-to-end view through multiple service providers Identifies complex VoIP performance issues Applicable to Enterprise IP Telephony, IP Centrex, Cable Telephony, Cellular/IP Compatible with emerging Secure RTP framework Standards approved Technology available today Use it!!!!

Performance Management: Key to IP Telephony Success

Performance Management: Key to Telephony Success Alan Clark, President & CEO Telchemy, Incorporated http://www.telchemy.com Vo Performance Management Voice, Video and other Real Time Applications Vo Performance