© 2002, Cisco Systems, Ic. All rights reserved. 1 111 Who? What? When? Where?

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Presentation transcript:

© 2002, Cisco Systems, Ic. All rights reserved Who? What? When? Where?

2 © 2001, Cisco Systems, Inc. All rights reserved. Session Number Presentation_ID Voice Quality & Availability: Cisco’s San Jose IP Telephony Infrastructure Bill Hennenlotter Kevin O’Healy July 2, 2003

© 2002, Cisco Systems, Ic. All rights reserved Introduction How to measure voice quality for the San Jose Campus Where are we now… Industry Standards for Measuring Voice Currently Deployed Tools Where are we going… Development of new methods for measuring voice Providing accurate statistics on the performance of the Cisco VOIP network How we will get there… Product Evaluation Implementation

© 2002, Cisco Systems, Ic. All rights reserved Industry Standards How Does the Industry Measure Voice Quality? MOS (Mean Opinion Score) Relies on a panel of human interpreters Calls are rated on a scale of 1 to 5 Results in a subjective measurement of voice quality Other Methods include: E-Model (ITU-T G.107) PSQM / PSQM+ (ITU-T P.861) PAMS PESQ (ITU-T P.862)

© 2002, Cisco Systems, Ic. All rights reserved Factors that Effect Voice Quality Leading Causes of Poor Voice Quality Network Congestion / Packet Loss Latency (One-way Delay) Jitter (Variable Delay) Codec Selection

© 2002, Cisco Systems, Ic. All rights reserved How Cisco Measures Voice Quality Analysis of the CDR/CMR Records CDR’s store call detail records Call Source / Destination CMR’s record voice quality measurements Packet Loss / Latency / Jitter EMAN Reporting Generation of Call Quality Rating based on CMR’s Unable to report in real-time Does not provide an overall cluster measurement

© 2002, Cisco Systems, Ic. All rights reserved Where we are going Is there a more effective way to measure voice quality? Voice Quality is one aspect of Voice Availability Voice Availability initiative started 3 months ago Project includes development of new standards and the evaluation of tools

© 2002, Cisco Systems, Ic. All rights reserved Criteria Criteria for Measuring Voice Availability 1) Server / Call Component Availability 2) CallManager Services Availability 3) TFTP Server Functionality 4) Device Registration 5) Off-Hook Test (Dial Tone) 6) Call Completion 7) Voice Quality

© 2002, Cisco Systems, Ic. All rights reserved Gathering Voice Availability Data

© 2002, Cisco Systems, Ic. All rights reserved Voice Availability Reporting

© 2002, Cisco Systems, Ic. All rights reserved The End Q & A