January 23, 2007 1教育部

Quincy Wu (solomon@voip.edu.tw)

Interconnecting VoIP on Taiwan Academic Network

(TANet)

January 23, 2007 2教育部

The History of TANetTaiwan Academic Network (TANet) was build in July of 1990. The ministry of education and several national universities constructed the TANet to support education and research. The TANet is aim to combine and provide the network to each level of schools and research center in Taiwan. Therefore the office staff of the research center, students and schoolteachers are able to learning, studying and research through the network. And have a chance to build a collaboration mode of information shearing.Base on the TANet, each level of schools build the school network and connected to the internet with whole country and whole world.TANet have impetus to education of information in elementary school and junior high school ， Learning and develop form the Internet and the information environment of lifetime learning ；To carry out the computerize of national education administration ； Providing research of education 、 life use etc…

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TANet Serve To:Each level of school, include : elementary school 、 junior high school 、 high school 、 vocational school 、 special education 、 further education 、 universities. (4,946)Internal education and research department (16)Library and Cultural Center (41)The departments of the ministry of education and government. (31) TANet served about 5 million students and 460,000 school teachers and office employee.

January 23, 2007 4教育部

The Development of Network Bandwidth

Internal Network Bandwidth– 2001: 155 Mbps– 2002: 622 Mbps– 2003: 6000 Mbps– 2004: 6000 Mbps

International Network Bandwidth– 2001: 100 Mbps– 2002: 180 Mbps– 2003: 310 Mbps– 2004: 3000 Mbps

January 23, 2007 5教育部

Development of Network Bandwidth

Bandwidth (Mbps)

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

2001 2002 2003 2004

Yearly

International

Internal

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TANet IP Telephony Deployment

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Deployment in City Network CenterI-Lan CNC– Scope ： 120 CPE (Gateway); each one has 4 FXS port

s– Amount ： 200 Hardphones– Procotol ： SIP

Tainan CNC– Scope ： All staffs in CNC & Bureau of Education ha

ve hardphones. – Amount ： 570 Hardphones– Protocol ： SIP

Kaohsiung CNC– Protocol ： H.323 hardphones

• SIP-H323 gateway will be deployed

★More than 50% counties/cities got Fiber to each school in TANet

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Kaohsiung

Tainan Hsinchu

I-LanNew CNC

?

??

?

January 23, 2007 9教育部

Current Issues

Interoperability Between SIP Servers– You can expect that every vendor claims that

they follow RFC 3261 …

Fault-Finding– Whose implementation causes the fault?

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If Everything Goes Fine …SIP Proxy Server

SIP Proxy Server

SIP

SIP

SIP

RTP

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What Happened?SIP Proxy Server

SIP Proxy Server

SIP

SIP

???

Ethereal

January 23, 2007 12教育部

Ethereal

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Not Easy for Remote Hosts

SIP Proxy Server

SIP Proxy Server

SIP

SIP

???

Ethereal

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Some Issues

To run Ethereal, you need to have root privilege on that server– To capture all packets on the NIC

You run Ethereal on the remote server, and display it on your laptop– The server need to support X Window

• Ok for most Linux servers

– This approach consumes lots of bandwidth

January 23, 2007 15教育部

Our Approach

Develop a supporting tool which– Capture SIP messages on the server– Send it to your laptop via HTTP– Ajax is adopted to support real-time update f

or better interaction.• Ajax is a mechanism adopted in Google Map and

Goggle Suggest to facilitate real-time update of browser display.

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System Architecture

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Screen Snapshot

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Demo

http://ipbx.ipv6.club.tw/sipmagnifier/

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Future Work

Access Control– Each manager should only be able to view th

e SIP messages of his own accounts.

Publish this tool on http://SourceForget.net

January 23, 2007 20教育部

Kaohsiung

Tainan Hsinchu

I-LanCNC

?

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