Traffic Characterization and Perceptual Quality Assessment for VoIP at Pakistan Internet Exchange-PIE. M. Amir Mehmood

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1 Traffic Characterization and Perceptual Quality Assessment for VoIP at Pakistan Internet Exchange-PIE M. Amir Mehmood

2 Outline Background Pakistan Internet Exchange - PIE Motivation Preliminaries Our Work i) Traffic Characterization ii) VoIP quality assessment iii) Simulation Conclusions

3 The Pakistan Internet Exchange RWP LHR KHI SEA-ME-WE3/4 High Speed optical fiber cable running under Sea from South East Asia Middle East till Western Europe

4 Logical Topology of PIE ISP s have multiple links of 2Mbps, 34Mbps,155 Mbps

5 PIE Network 2005

6 Motivation Traffic Prediction based on current trends is a useful indicator of the growth PIE What flows? How much Traffic? Is it good enough?

7 Motivation (2) Internet Similar QoS Multimedia Broadband Network What is the QoS level for real time application?

8 Motivation (3) Who is to blame in case of poor QoS? Backbone Service Provider or Access Service Provider

9 Traffic Capturing at one Regional Node Used port mirroring at the Gigabit Link between the regional gateway router and the cisco catalyst 6506 Switch. Sniffer from Network General for statistics collection. Statistics taken for the period of two months (15th March to 14th May 2005)

10 PIE Network 2005

11 Protocol Wise Break-up: What flows?

12 Packet Size Distribution

13 VoIP Voice Stream is sampled at fixed rate Directly filled these samples into packets or compressed before filling these samples. { Add IP/UDP/RTP Headers De-jitter Buffer Fixed Interpacket Delay Variable Inter packet Delay - Jitter

14 VoIP { Different kind of delays (Fixed or Variable) Algorithmic Delay Processing Delay Packetization Delay Transmission Delay Propagation Delay Queuing Delay De-jitter Buffer Fixed Interpacket Delay Variable Inter packet Delay - Jitter

15 VoIP Speech Quality depends on VoIP End to End Delay Packet Loss Delay Jitter { De-jitter Buffer Fixed Interpacket Delay Variable Inter packet Delay - Jitter

16 Voice Quality Is it good enough? Perceptual Mean Opinion Scores (MOS) Time Consuming and Expansive Process Quality Models Simulate human rating behavior by correlating perceptual QoS with other quantifiable parameters Perceptual Speech Quality Measure - PSQM (ITU-T P.861) Perceptual Evaluation of Speech Quality -PESQ (ITU-T P.862) Both models compare the reference and degraded speech samples. The E-model (ITU-T G.107) Transmission Planning Tool

17 The E-model (ITU-T G.107) Predict Speech Quality from M2E impairments

18 The E-model Transmission Quality Rating, R-factor R R 0 I s I d = R0 I s I d I e eff + Signal to noise ratio Simultaneous impairments Delay impairments A I e eff A Equipment impairments due to low bit rate codec and packet loss Advantage Factor

19 Voice Quality Classes R User Satisfaction Very Satisfied Satisfied Some users dissatisfied Many users dissatisfied Nearly all users dissatisfied Not recommended MOS

20 Experiments

21 SIP Call Signaling

22 Scenario - A

23 Scenario A (contd)

24 Experiments

25 Scenario - B

26 Experiments

27 Scenario - C

28 Experiments

29 Scenario - D

30 Perceptual quality assessment for VoIP for the PIE backbone

31 Results In the 4 scenarios studied: The backbone links exhibit low mean jitter Access links present congestion hot spots A satisfactory QoS cannot be achieved on an end to end basis because of bottlenecks in the access links

32 Simulation of PIE IP Backbone in OPNET IT Guru

33 Simulation of two separate backbones for voice and data

34 Comparitive Analysis Average end to end delay Graphs for G.711, G and G.729 After measuring End to End one way delay we made all calculations for MOS

35 Limitations OPNET IT Guru is a limited version and does not allow more than 2Million Discrete events simulation.

36 Conclusions QoS for VoIP can not be achieved unless End-to-End QoS architecture is deployed both at backbone and at the access links.

37 Future Work Measeure voip QoS at the DTAG Network for DSL and Wireless Networks. IP-PALM Interprovider QoS

38 Thank you

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