© 2002, Cisco Systems, Ic. All rights reserved.© 2002, Cisco Systems, Ic. All rights reserved. 11111

Who? What? When? Where?

Understanding the Possibilities & Pinpointing DPA Issues

Cisco’s IP Realm

Outside Cisco

Shared Realm (Cisco/AVAYA)

IP Network

POTS

PSTN

IP

DPA

External Phone

Internal Phone

OCTEL

* Wiring* Software* Hardware* Misconfiguration* Signaling

* IP Network Stability* QoS* Software* Hardware* Misconfiguration

* Bad connections* PSTN issues* Outside Jurisdiction

2© 2001, Cisco Systems, Inc. All rights reserved.

Session NumberPresentation_ID

Voice Quality & Availability:Cisco’s San Jose IP

Telephony Infrastructure

Bill HennenlotterKevin O’HealyJuly 2, 2003

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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

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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)

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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.© 2002, Cisco Systems, Ic. All rights reserved. 66666

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

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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.© 2002, Cisco Systems, Ic. All rights reserved. 88888

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

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Gathering Voice Availability Data

T1 Gateway

LocalIP Network

Local IPPhone #1

POTS

IP

IP

Call ManagerCluster #1

Local IP Phone #2

Remote IPNetwork

PSTN

POTS POTS

Gatekeeper

IP

Call ManagerCluster #2

IP

Local IP Phone #3

( )

1-800Long DistanceLocalRemote

IP PhoneRemote Call

Manager Cluster

© 2002, Cisco Systems, Ic. All rights reserved.© 2002, Cisco Systems, Ic. All rights reserved. 1010101010

Voice Availability Reporting

100%

0%

Target Availability99.95%

Phone Availability Call Availability

100%

0%

Target Availability99.95%

100%

0%

Target Availability99.95%

Voice Quality Availability

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The End

• Q & A