Voip Testing - A Practical Guide.pdf
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RADCOM Equipment, Inc.
6 Forest Ave.
Paramus, NJ 07652
TEL:
800-RADCOM-4
FAX:
201-556-9030
www.radcom-inc.com
E-Mail:
info@radcomusa.com
www.protocols.com
support@radcomusa.com
________________________________________________________________
Voice over IP Testing - A Practical Guide
RADCOM White Paper
Author: Oded Agam
Oagam@RADCOMusa.com
Version: 1.4
Communications Category
One of two Runners Up
2001
______________________________________________________________________________________
VoIP Testing - A Practical Guide.doc
Page 1
6/14/01
RADCOM Equipment, Inc.
6 Forest Ave.
Paramus, NJ 07652
TEL:
800-RADCOM-4
FAX:
201-556-9030
www.radcom-inc.com
E-Mail:
info@radcomusa.com
www.protocols.com
support@radcomusa.com
________________________________________________________________
Table of Contents
1.
Introduction ............................................................................................................................................ 3
2.
VoIP Architecture ................................................................................................................................... 4
3.
Test Strategy ........................................................................................................................................... 5
4.
VoIP Testing........................................................................................................................................... 6
5.
Gateway Testing ..................................................................................................................................... 9
6.
Gatekeeper Testing ............................................................................................................................... 11
7.
IVR Testing .......................................................................................................................................... 13
8.
Billing & Pre-paid Testing.................................................................................................................... 15
9.
NMS Testing......................................................................................................................................... 16
10.
Conclusions....................................................................................................................................... 17
11.
Appendix I - List of Specifications ................................................................................................... 18
12.
Appendix II – Glossary..................................................................................................................... 19
13.
About the Author .............................................................................................................................. 23
Table of Figures
Figure 1 - Typical VoIP architecture .............................................................................................................. 4
Figure 2 - Test Strategy .................................................................................................................................. 5
Figure 4 – Gateway testing ............................................................................................................................. 9
Figure 5 – PAMS provides objective MOS results....................................................................................... 10
Figure 6 - Gatekeeper testing........................................................................................................................ 11
Figure 7 - IVR testing ................................................................................................................................... 13
Figure 8 - DTMF frequencies ....................................................................................................................... 13
Figure 9 – VoIP call analysis and packet statistics ....................................................................................... 14
Figure 10 - Billing/Prepaid system testing.................................................................................................... 15
Figure 11 - NMS testing ............................................................................................................................... 16
______________________________________________________________________________________
VoIP Testing - A Practical Guide.doc
Page 2
6/14/01
RADCOM Equipment, Inc.
6 Forest Ave.
Paramus, NJ 07652
TEL:
800-RADCOM-4
FAX:
201-556-9030
www.radcom-inc.com
E-Mail:
info@radcomusa.com
www.protocols.com
support@radcomusa.com
________________________________________________________________
1. Introduction
Voice over IP networks are complex! They represent the converging worlds of tele
-
and
data communications, and therefore present myriad implementation and testing
challenges
:
Integration
to traditional telecom infrastructure
Integration to
billing
systems
Many add-on services
Large variety of
protocols
Quality
is an issue
Network specialists are expensive and scarce
Reliability
is a must
Multiple
High Quality Services
: voice, fax, video, unified messaging, call
centers, etc.
This white paper presents a typical VoIP architecture and then suggests a framework for
testing VoIP networks. The test strategy is presented as well as a detailed discussion of
the actual testing required for each network element. Finally, a list of Voice over IP
specifications is provided as an appendix as well as a list of acronyms. The main
objective of this paper is to provide insight into the intricacies of architecting Voice over
IP networks of carrier grade quality. It is intended for network design and test engineers.
______________________________________________________________________________________
VoIP Testing - A Practical Guide.doc
Page 3
6/14/01
RADCOM Equipment, Inc.
6 Forest Ave.
Paramus, NJ 07652
TEL:
800-RADCOM-4
FAX:
201-556-9030
www.radcom-inc.com
E-Mail:
info@radcomusa.com
www.protocols.com
support@radcomusa.com
________________________________________________________________
2. VoIP Architecture
A typical VoIP network includes the following components:
Media gateways
Signalling gateways
Gatekeepers
Class 5 switches
SS7 network
Network management system
Billing systems
All of these network elements communicate with each other using a plethora of
protocols, as can be seen in Figure 1. A detailed list of protocols and specifications can
be seen in Appendix I.
Figure 1 - Typical VoIP architecture
______________________________________________________________________________________
VoIP Testing - A Practical Guide.doc
Page 4
6/14/01
RADCOM Equipment, Inc.
6 Forest Ave.
Paramus, NJ 07652
TEL:
800-RADCOM-4
FAX:
201-556-9030
www.radcom-inc.com
E-Mail:
info@radcomusa.com
www.protocols.com
support@radcomusa.com
________________________________________________________________
3. Test Strategy
Testing VoIP networks is a tri-fold task:
Functionality verification
Standards compliance
Performance verification
A successful pre-deployment testing strategy must address each of these three facets:
Functionality
Verify that all functions work properly
Functionality
Under Stress
Verify that all functions work
properly under stress
Phase 1
Fault-Insertion
Test
Verify that the system reacts as
expected under non-legal conditions
Long-Term
Stability
Verify that all functions work properly and
consistently via long term stability testing
Performance
Test
Verify performance versus compliance
with System requirements
Phase 2
Figure 2 - Test Strategy
Changes such as software or hardware version upgrades can cause degradation in
functionality, quality and performance. Therefore, it is very important to repeat this test
cycle after every change made to the VoIP network.
______________________________________________________________________________________
VoIP Testing - A Practical Guide.doc
Page 5
6/14/01
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