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Enhancing Voice Call Performance Measurement with Call Detail and Maintenance Records

Explore the significance of Call Detail Records (CDR) and Call Maintenance Records (CMR) in measuring call performance for voice over IP systems. Learn about Cisco's background in VoIP, network architecture, QoS for voice, and how CDR/CMR data from Cisco IP Phones can optimize performance measurement.

larissa-reid
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Enhancing Voice Call Performance Measurement with Call Detail and Maintenance Records

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  1. Call Detail and Call Maintenance Records for Performance Measurement

  2. Call Detail Records - CDR: info about the endpoints and control/routing of a call • Used for billing • Call Management Record - CMR: info about the quality of the streamed audio of a call • May have more than one CMR per CDR • Both CDR and CMR are needed • Documented by Cisco

  3. Background and Motivation • 1998 Voice over IP with Selsius • now > 12,000 ethernet VoIP instruments • Integrated Backbone Architecture • ATM moving to routed ethernet • Star of routers - 2 levels • 8 routers at UP

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  6. Service Level for Voice • Performance SL developed to support voice • One way latency < 25ms • Loss < 0.001% packets • Jitter < 5ms

  7. SL continued • Model voice traffic and measure it • Modeled by UDP streams at 85 kbps • Measured loss, latency and jitter • Van Jacobson talk/paper about pathchar - MSRI • using iperf 1.7

  8. QoS for Voice • Implemented Expedited Forwarding • To protect the voice traffic • in 6500/7600 Cisco router • Compared with best effort vs EF for voice

  9. While at a meeting • While at a meeting with Cisco about a separate problem, I stumbled upon the fact that the Cisco IP Phones track network statistics

  10. The phones report loss, latency, jitter, packets and octets sent and received. • which can be recorded in CDR/CMR • CMR

  11. So, the next step • Establish thresholds • intra system • phone-to-phone • Inter-system • phone-to-someone-else’s-stuff

  12. This is still a work in progress • Questions • Thank you

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