Common VoIP Metrics - Telchemy

[Pages:17]International Telecommunication Union

Common VoIP Metrics

Alan Clark

CEO, Telchemy

Workshop on End-to-End Quality of Service.What is it? How do we get it? Geneva, 1-3 October 2003

ITU-T

Summary

o Typical VoIP Problems o Management Requirements o Common Metrics proposal o Media path reporting o Reporting through signaling protocols o RTCP XR o Applications examples

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

2

ITU-T

IP related problems

Gateway

Gateway

CODEC

Lost Packets

Delay & Jitter

Packet discards by jitter buffer

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

3

ITU-T

Non-IP related problems

Signal Level too High or low

VoIP Gateway

Hybrid

Uncanceled echo

Echo Canceller

Echo from Unbalanced Hybrid

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

4

ITU-T

VoIP Metrics Reporting

Signaling based reporting

Call Control

Network Management reporting

IP Endpoint

Media path reporting

IP Endpoint

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

5

ITU-T

Signaling System Reporting

End of call message

Call Control

IP Endpoint

Voice over IP quality metrics

Integrates call quality data into CDR system, supports service management / billing

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

6

ITU-T

Media Path Reporting

IP Endpoint

Media path reporting

IP Endpoint

Allows information to be exchanged between endpoints Allows information to be sent through firewalls

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

7

ITU-T

Management Reporting

SNMP "Get"

Management System

IP Endpoint

Provides access to information on an "as needed" basis Integrates with current NMS

1-3 October 2003

Workshop on End-to-End Quality of Service. What is it? How do we get it?

8

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