Call Detail and Call Maintenance Records for Performance Measurement
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Call Detail and Call Maintenance Records for
Performance Measurement
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•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
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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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Service Level for Voice
•Performance SL developed to support voice•One way latency < 25ms•Loss < 0.001% packets•Jitter < 5ms
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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
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QoS for Voice•Implemented Expedited
Forwarding •To protect the voice traffic•in 6500/7600 Cisco router
•Compared with best effort vs EF for voice
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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
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•The phones report loss, latency, jitter, packets and octets sent and received.
•which can be recorded in CDR/CMR
•CMR
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So, the next step•Establish thresholds•intra system•phone-to-phone
•Inter-system•phone-to-someone-else’s-stuff
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•This is still a work in progress•Questions•Thank you