TELECOM

VoIP Testing Methods

Nº 1311
DATE: CALL
PRICE NIS: 2120 + VAT
DURATION: 2 Days

Course Overview:

In this seminar we shall discuss the challenges over the IP network, impairments sources and QoS issues. You will learn the main testing standards to evaluate Voice quality. Furthermore we shall find out the main causes for quality degradation over the IP network. In this seminar we shall explore different testing methods: Passive and proactive approaches. In this seminar we shall provide demonstrations for VoIP testing methods and present the Predictive Environment concept for real network simulation.

Who should attend?

QA Engineers, software developer, Technical support and field engineers

Prerequisities:

Basic knowledge of IP Networks and Basic Telephony

Course Objectives
The Participant will be able to:

Identify the network impairments sources
Define QoS, CoS and QoE parameters;
Describe the major objective and subjective Voice quality evaluating standards;
Describe required testing topologies for quality and performance evaluation;
Describe the predictive environment in the test-bed;
To plan required tests in conjunction with an ATP document

Course Outline:

Day 1

1. Network Impairments

Network Impairments description
The sources of network Impairments
Correlation between the Impairments

2. QoS challenges for VoIP

The need for QoS
Solutions to provide QoS
QoS requirements for Triple-Play

3. Demo for QoS tests

Packet Loss
Packet Miss-order
Jitter and Interarrival delay
Duplicate packets

4. Voice degradation over IP Networks

Voice quality and Distortion phenomenon
Infrastructure factors
IP Network considerations
Compression effects

5. Performance and Traffic factor

Traffic considerations and calculation models
Bandwidth calculations
Erlang and Bandwidth correlation
Calculations examples

6. What should be tested?

Testing milestones for deployment process
Vital parameters to be tested

Day 2

7. Predictive Environment for reliable tests

What is Predictive Environment?
Network testing problems and needs
Predictive environment profile
Required features
Network Impairments recording
Required Statistics

8. Stress tests for performance evaluation

Understanding the types of Challenges
What should be tested?
Stress tests
Performance versus quality

9. Demo for Performance tests

VoIP Simulator and setup process
VoIP Stress tests
Results analysis

10. Objective Voice quality measurements methods

About objective speech measurement
Speech measurement methods: PSQM, PSQM+, PAMS, PESQ, E-Model

11. VoIP Troubleshooting methods

Possible congestion sources
How to locate these sources
How to avoid Congestion phenomenon

12. Optimization procedure

Correlation between degradation’s causes
What is optimization procedure?
How to implement it?
Examples

13. Demo for Voice quality tests

Voice quality tests
PAMS and PESQ
Insertion Loss and Return Loss
Background Noise

14. Summary

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