THE ANALYSIS AND SIMULATION OF VOIP

Presented by Team #3:

Demet Dilekci ddilekci@sfu.ca

Conrad Wang cjw11@sfu.ca

Jiang Feng Xu jfxu@sfu.ca

http://www.sfu.ca/~cjw11/427Project.html

ENSC 427 Communication Networks

Spring 2013

Final Project Presentation

Overview

• Motivation

• Background

• Technical details

• Implementation in OPNET• VoIP over LAN (Local Area Network )• VoIP over WAN (Wide Area Network )• VoIP over WLAN (Wireless Local Area Network)• VoIP over WWAN (Wireless Wide Area Network)

• Discussion• Result and Analysis

• Recommendations

Motivations

• To analyze and discuss the parameters that affect the

quality of VoIP

• To simulate scenarios by using OPNET

VoIP Background

• Voice over Internet Protocol

• An Alternative to Public Switched Telephone Network

• Uses Packet Switching instead of Circuit Switching

• Digital Signal instead of Analog Signal

VoIP Advantages / Disadvantages

• Advantages:

• Cost Saving

• Flexible

• Rich Features

• Disadvantages:

• Network quality determines call quality

• Higher call drop rate compared to PSTN

• 911 Emergency call is unable to trace location

Technical Details

• Jitter

• Mean Opinion Score (MOS)

• End-to-end Delay

• Packet Loss

Technical details

• ITU Telecommunication Standardization Sector (ITU-T) Values [6] [7]:

Average Quality Ideal Quality

Jitter < 60 ms < 20 ms

End-to-end Delay < 150 ms < 50 ms

Packet Loss Rate < 5% < 1%

Quality Scale MOS

Excellent 5

Good 4

Fair 3

Poor 2

Bad 1

Codec (Coder/Decoder)

G. 711

G. 723

G. 729

Implementation in OPNET

• VoIP over LAN (Local Area Network )

• VoIP over WAN (Wide Area Network )

• VoIP over WLAN (Wireless Local Area Network)

• VoIP over WWAN (Wireless Wide Area Network)

OPNET : VoIP over LAN Designs

• Different # of Clients (2, 20 200) & Traffic Load (Light / Heavy) & Codec

OPNET : VoIP over LAN: Results

• Results: Jitter and MOS in office

OPNET : VoIP over LAN: Results

• Results: ETE Delay and Packet Loss in office

OPNET : VoIP over LAN: Discussion

• Discussion

• Increasing number of client & traffic load doesn`t effect the result

• Jitter in good for all codec types

• 711 gives better values (Mos close to good level)

• 729 Mos : fair level. It is below good

• 723 Mos & packet end-end delay: fair level

• 723 send less voice traffic

OPNET: VoIP over WAN Design 1

• # of Clients: 20 & Different Traffic Load (Light / Heavy) & Codec & Links

OPNET: VoIP over WAN Design 2

• # of Clients: 200 & Different Traffic Load (Light / Heavy) & Codec & Links

OPNET : VoIP over WAN: Results

• Results: Jitter and MOS in long distance

OPNET : VoIP over WAN: Results

• Results: ETE Delay and Packet Loss in long distance

OPNET: VoIP over WAN Discussion

• # of client : 20

• Codec 711, links PPP DS0 / DS1:

• PPP DSO values are below acceptable level.

• PPP DS1 is good over all (MOS is between good and fair level)

• Codec (711, 729, 723), link PPP DS1:

• 711: good level (MOS level close the good level)

• 729 and 723 MOS level: fair level

• 723 sent less voice traffic

Implementation in OPNET: WLAN / WWAN

Results – Jitter and MOS in office

Results – ETE Delay and Packet Loss in office

Results – Jitter and MOS in long distance

Results – ETE Delay and Packet Loss long distance

Discussion

• Wireless:

• Base on the results, we noticed that the outputs do not change much even when we set the application traffic from heavy to light.

• Also, when we change the connection link, the outputs do not change significantly.

• Comparing office and long distance communication, we noticed that the Jitter, MOS Value, Delay Variation and ETE Delay only have a slight difference. Thus, change falls into a acceptable range.

Recommendations

• VoIP has many major drawbacks that makes the call

quality not as good as PSTN

• However, it has the most important advantage over PSTN

which is the cost

• Use VoIP to save cost

• Use PSTN for important calls due to its reliability

References

[1] J. Davidson, J. Peters, M. Bhatia, S. Kalidindi and S. Mukherjee, Voice over IP

Fundamentals. Indianapolis: Cisco press, 2007

[2] "Understanding Voice over IP Protocols",

http://www.cisco.com/en/US/tech/tk652/tk701/tech_digests_list.html, 14 Feb 2013

[3] J. Middleton, "Top 11 Technologies of the Decade", IEEE Spectrum, vol 48, issue.1, pp.

34-37, January 2011

[4] J. Soares, S. Neves and C. Rodrigunes, "Past, Present and Future of IP Telephony",

IEEE CTRQ Conference, pp. 19-24, 2008.12

[5] L. Chu, X. Lan, Y. Tan, "The Design and Simulation of Enterprise's VoIP Network",

IEEE ICECE Conference, pp. 2653-2655, 2011

[6] E. Chi-Pong Chan, “Performance Analysis of Voice Communications in a Private

802.11 Network”, Ensc 835: High-Performance Networks, 2003, pp 8

[7] K. Alutaibi, “Performance Analysis of VoIP over WiMAX and Wi-Fi Networks”, Ensc

894: Communications Networks, 2012, pp. 3-4

Questions?