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A Distributed Tool for VoIP Stress Testing

Speaker: cheng-lin Tsai

Adviser: Quincy Wu

School: National Chi Nan University

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Outline

Introduction SIP Distributed SIP Pressure Test

fping OpenNTPD SIPp

D-SIPp (Distributed-SIPp) Implementation Conclusions and Future work Reference

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Introduction

VoIP 使用者大幅增加 伺服器的壓力測試

SmartBits D-SIPp

(Distributed-SIPp )

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SIP

Session Initiation Protocol (RFC 3261) 主從式 (Client-Server) 架構

UA 1<sip:UA1@pc1.home.net>

UA 2<sip:UA2@station1.work.com>

Proxy Serversip:server.work.com

(1) INVITEUA2@server.work.com (2) INVITE

UA2@station1.work.com

(3) 100 Trying(4) 180 Ringing

(5) 180 Ringing

(6) 200 OK(7) 200 OK

(8) ACKUA2@station1.work.com (9) ACK

UA2@station1.work.com

Connection (Media Stream)

(10) BYEUA2@station1.work.com (11) BYE

UA2@station1.work.com

(12) 200 OK(13) 200 OK

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Distributed SIP Pressure Test

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Distributed SIP Pressure Test (Cont.) 啟動 Slave 時間同步 Generate Traffic

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Distributed SIP Pressure Test (Cont.) 啟動 Slave

確保 N 台 Slave 電腦有啟動，運用 fping 軟體做快速判斷。

Fping vs. ping

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Distributed SIP Pressure Test (Cont.) 時間同步

要使得 N 台電腦同步，必須要與 NTP 伺服器對時，因此採用 OpenNTPD 提供 LAN 裡的 Slave 電腦做對時。

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Distributed SIP Pressure Test (Cont.) Generate Traffic

SIPp – dynamic display of statistics about running tests

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D-SIPp (Distributed-SIPp)

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Implementation

Master : 10.10.59.188 Slave : 10.10.59.144 , 10.10.59.145 Receiver : 10.10.59.149 Total calls : 200

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Implementation (Cont.)

D-SIPp_master

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Implementation (Cont.)

D-SIPp_master

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Implementation (Cont.)

D-SIPp_slave

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Implementation (Cont.)

Receiver

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Conclusions and Future work

降低測試成本

測量 MOS 值

採用 GPS 建置 stratum 1 ，提升時間同步的準確度

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Reference

J. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler, “SIP ： Session Initiation Protocol”, Network Working Group, RFC3261, IETF, June 2002.

J. Postel, “Internet Control Message Protocol” Network Working Group, RFC 792, IETF, September 1981

David L. Mills, “Network Time Protocol (Version 3) Specification, Implementation and Analysis” Network Working Group, RFC 1305, IETF, March 1992

SIPp [http://sipp.sourceforge.net/] H. Schulzrinne, S. Casner, R. Frederick, V. Jacobson, “ RTP: A

Transport Protocol for Real-Time Applications”, Network WORKING Group, RFC 1889, IETF, January 1996.

ITU-T “The E-model, a computational model for use in transmission planning” ,ITU-T Recommendation G107, March 2005