Asynchronous Interactive Design of Web Applications:Real-time SIP Message Monitoring System using AJAX

Student: Yan-Hsiang Wang

Advisor: Dr. Quincy Wu

Graduate Institute of CSIE

National Chi Nan University

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Motivation

Session Initiation Protocol (SIP) is widely used as the signaling protocol for Voice over IP.

SIP is adopted by 3GPP in IP Multimedia Subsystem (IMS).

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8

9

INVITE

180 Ringing200 OK

ACKConversation

BYEOK

REGISTER

200 OK

INVITE

180 Ringing

2

3

5

6

7

Bob Alice

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A Convenient Tool - Ethereal

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Limitation of Ethereal

Hard-phone users cannot install software to capture packets.

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Server-based SIP Packet Capturing

Running SIP Capturing on Server-side instead of Client-side.

Existing web-base systems cannot update data in pages seamlessly. WIST - Web Interface for SIP Trace

http://sourceforge.net/projects/wist Distributed SIP Analyzer

http://sourceforge.net/projects/sipanalzyer

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ExistingSystem 1

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Existing System 2

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AJAX

Asynchronous Javascript And XML This term was born in February 2005. It is not a technology; it is an approach. Connect Web Browser and Web Serve

r asynchronously. Reload data without refreshing pages.

Create an interactive web application Which behaves like a desktop application.

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Ajax Applications

Auto-Complete (Yahoo! Travel) http://travel.yahoo.com/

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Ajax Engine

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Limitation of AJAX

It can’t work when some browsers disable “JavaScript”

Most popular browsers support AJAX Internet Explorer 5.0 ~ Mozilla 1.0 ~ Safari 1.2 ~ Opera 8.0 ~

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Our System Architecture

ApacheMySQL

Ethernet card

Captor (libpcap)

AJAX engine

HTML +Cascading Style SheetsData

JavaScript Call

SIP Extractor (php)

Server-side system Client-side system

web browser

HTTP Request XML Data

PHP Query

Data

Ethernet Frame

SIP Message

SIP Header Field

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Client-Side System

Our querying page is based on an Ajax engine. Refresh data seamlessly Update the latest packets in real time Provide desktop-like application interface

friendly Use tree menu as message browser.

Expand the message dynamically

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Integration with SIP server(1)

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Integration with SIP server(2)

SERweb

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Implementation

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Advantages

Surfing web-base system is convenient and easy (compared with Ethereal).

User can search the historical data with ordinary privilege. Ethereal requires super-user privilege to capture

packets. We can package these messages in a Pcap

format file and mail it to users so that they can parse it with other tools (Ethereal, Wireshark).

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Performance Measurement

Environment FreeBSD 5.4 as Operating System MySQL-5.0.22 as Database Apache-2.0.58_2 as Web server Ser-0.9.6_2 as SIP server Sajax-0.12 as Ajax library Two SIPp generators on WinXP as Client

Call setup scenario (powered by SIPp)

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Comparison with Running Ethereal on the Server(1/2)

Accumulated Network Traffic

0

500

1000

1500

2000

2500

3000

3500

60 120 180 240 300 360 420 480 540 600

Time (second)

Pack

et S

ize

(KByt

e)

Remote monitoring by X11Remote monitoring by HTTPSIP signaling

Concurrent Calls: 30

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Comparison with Running Ethereal on the Server(2/2)

Accumulated Network Traffic

0

10000

20000

30000

40000

50000

60000

60 120 180 240 300 360 420 480 540 600

Time (second)

Pack

et S

ize

(KByt

e)

SIP signalingRemote monitoring by X11Remote monitoring by HTTP

Concurrent Calls: 1000

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System Loading

0

0.5

1

1.5

2

2.5

3

Step1 Step2 Step3 Step4 Step5CPU

One

Min

ute

Load

Ave

rage

20050010003000500070009000

0%1%14%

18%

5%

62%

http

ser

php

captor

mysql

idle

Step1: only httpd, mysqld, ser

Step2: start stress testing

Step3: start capturing and pipe the output to the dissector

Step4: enable live update on the browser

Step5: work continuously without SIP traffics

Calls per second: 10,000Total calls: 20,000

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Performance Measurement

Environment Fedora core 6 as Operating System MySQL-5.0.27 as Database Apache-2.2.4 as Web server

Call setup scenario (powered by SIPp) Max Allowed Rate: 10,000 Concurrent Calls: 0~8,000(with interval 200) Total calls: 20,000

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Call Failure Rate

0%5%

10%15%20%25%30%35%40%45%50%55%60%

0 1000 2000 3000 4000 5000 6000 7000 8000Concurrent Calls

Faile

d Cal

ls

SER SER + SIP Fluoroscope SER + Distributed SIP Analyzer

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Conclusion

Advantage Conserve the bandwidth of network Friendly interface Convenient to use

Future work Access control Inter-domain collaboration

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Demo

Show the Wireshark image to this notebook Enable SIP Fluoroscope Live Update Sepp(Wifi-phone) calls Test(X-Lite) Capture SIP signalings

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Q&A

Thanks for your comments!