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Common VoIP Metrics

Common VoIP Metrics. Alan Clark CEO, Telchemy. Summary. Typical VoIP Problems Management Requirements Common Metrics proposal Media path reporting Reporting through signaling protocols RTCP XR Applications examples. IP related problems. Gateway. Gateway. Delay & Jitter.

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Common VoIP Metrics

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  1. Common VoIP Metrics Alan Clark CEO, Telchemy

  2. Summary • Typical VoIP Problems • Management Requirements • Common Metrics proposal • Media path reporting • Reporting through signaling protocols • RTCP XR • Applications examples Workshop on End-to-End Quality of Service. What is it? How do we get it?

  3. IP related problems Gateway Gateway Delay & Jitter Lost Packets CODEC Packet discards by jitter buffer Workshop on End-to-End Quality of Service. What is it? How do we get it?

  4. Non-IP related problems Signal Level too High or low VoIP Gateway Hybrid Echo Canceller Echo from Unbalanced Hybrid Uncanceled echo Workshop on End-to-End Quality of Service. What is it? How do we get it?

  5. VoIP Metrics Reporting Signaling based reporting Call Control Network Management reporting IP Endpoint IP Endpoint Media path reporting Workshop on End-to-End Quality of Service. What is it? How do we get it?

  6. Signaling System Reporting End of call message Call Control Voice over IP quality metrics IP Endpoint Integrates call quality data into CDR system, supports service management / billing Workshop on End-to-End Quality of Service. What is it? How do we get it?

  7. Media Path Reporting Media path reporting IP Endpoint IP Endpoint Allows information to be exchanged between endpoints Allows information to be sent through firewalls Workshop on End-to-End Quality of Service. What is it? How do we get it?

  8. Management Reporting Management System SNMP “Get” IP Endpoint Provides access to information on an “as needed” basis Integrates with current NMS Workshop on End-to-End Quality of Service. What is it? How do we get it?

  9. Common VoIP Metrics? • Equipment needs only count/ measure one set of metrics regardless of the protocol used for reporting • Network manager/ operator can see the same set of data regardless of how it was reported • Drive the equipment vendors towards a common “sensible” metrics set Workshop on End-to-End Quality of Service. What is it? How do we get it?

  10. Loss rate Discard rate Burst density Gap density Burst duration (mS) Gap duration (mS) Round trip delay (mS) End system delay (mS) Signal level RERL Noise level Gmin R factor Ext R MOS-LQ MOS-CQ Rx Config - Jitter Buffer Nominal Jitter Buffer Max Jitter Buffer Abs Max RTCP XR protocol Workshop on End-to-End Quality of Service. What is it? How do we get it?

  11. RTCP XR applications GW • Provides several key functions: • Exchange information between endpoints to support more comprehensive call quality estimates • Allows mid-stream systems to monitor endpoint QoS, even if RTP payload encryption is used • Supports exchange of endpoint measured QoS where endpoint is in different management domain • Supports endpoint adaptation Workshop on End-to-End Quality of Service. What is it? How do we get it?

  12. Migrating into signaling protocols • RTCP XR – IETF AVT group • In RFC editor queue – RFC in October? • Already being implemented by manufacturers • H.323 …. H.460.9 Annex 2 • Consent in January 2004? • H.248 …. H.248.rtcpxr • Consent in January 2004? • SIP ….. New work in IETF Workshop on End-to-End Quality of Service. What is it? How do we get it?

  13. Generating VoIP Metrics End of Call Signaling RTCP XR Loss/ Discard “Software Probe” 200 IPS CODEC Signal Noise RERL DSP IP Phone or Gateway Workshop on End-to-End Quality of Service. What is it? How do we get it?

  14. Accumulating endpoint metrics in Gateway C”Q”DR SNMP or Bulk upload PCM Soft Probe RTCP XR IP “cloud” SNMP MIB based around RTCP XR metrics Workshop on End-to-End Quality of Service. What is it? How do we get it?

  15. Example – IP Centrex Service Provider domain Access link congestion IP Phone LAN congestion IPNetwork Passive hub or shared Ethernet segments Softswitch Poorly located server NO VISIBILITY OF PROBLEMS Workshop on End-to-End Quality of Service. What is it? How do we get it?

  16. Solution to IP Centrex problem Access link congestion IP Phone LAN congestion IPNetwork Real time reporting through RTCP XR provides feedback on Service Quality Softswitch Management System Workshop on End-to-End Quality of Service. What is it? How do we get it?

  17. Summary • Equipment needs only count/ measure one set of metrics regardless of the protocol used for reporting • Network manager/ operator can see the same set of data regardless of how it was reported • Drive the equipment vendors towards a common “sensible” metrics set • Already gaining support within the industry: • Nine+ test equipment vendors will be supporting RTCP XR decodes by the end of 2003 • At least three major IP equipment manufacturers expected to be supporting RTCP XR by the end of 2003 • Three major DSP software vendors providing support for this architectural model by the end of 2003 Workshop on End-to-End Quality of Service. What is it? How do we get it?

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