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VOIP: Lab Exercise

Stephen Okay

Abdus Salam Intl Center for Theoretical Physics, Trieste Italy

March 4th 2010

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Goals

Exercise 1

Set up a small office phone system using analog phones, ATAs and anAsterisk server on a LAN

Add users and extensions to the Asterisk server

Configure the ATAs to register with the Asterisk server

Test it out: Make calls, leave and check voicemail, have fun!

Exercise 2Set up a extensions for users at a remote campus connected via WLAN

Users are moving to different buildings at a University. These are all connected up

by a WLAN. Set up an access point to allow the phone/ATA to register to the

Asterisk server over the wireless network.

What mode(client/AP/bridge) would be best to do this with ? Should you NAT ?

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Contacting the Asterisk Server

From a web browser open the following link:

http://192.168.4.200:8088/asterisk/static/config/index.htmlLogin with the username:administrator password:wireless

From the menu on the left, click on Users

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http://192.168.4.200:8088/asterisk/static/config/index.htmlhttp://192.168.4.200:8088/asterisk/static/config/index.htmlhttp://192.168.4.200:8088/asterisk/static/config/index.htmlhttp://192.168.4.200:8088/asterisk/static/config/index.html

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Adding users with Asterisk-GUI

Click on Create New User fill in like below and click Update

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Adding an extension to Asterisk(concluded)

Click on System Status and you should see the new extension

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Configure your ATA

Perform a factory-reset of your ATA

Pick up the phone and dial ****When prompted, enter 73738#, wait a moment, then press 1

The ATA will be reset to factory defaults

Find out the IP address of your ATA

Pick up the phone and dial ****

When prompted, enter 110# and write down the IP address spoken to

you

In a browser window go to: http://

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Configure the ATA

Click on Admin Login

Admin

Login

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Configure the ATA

Go to this URL:

http:///admin/advancedClick on Line1 and you should see a screen like this:

set to yes

Leave as no for now

set to 5060

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Configure the ATA

Make these changes, then click Save Settings. You can leave the

other settings alone

IP of Asterisk Server

Set to yes

Set to wireless

Set to your group name Your extension

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Configure the ATA

Click on SIP and confirm/set the settings indicated below, then

Save settings

Set to 60 just to start, then change to

something more like 600 once youve

verified things are up and running

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Check Registration

Registration State should now be Online

If you pick up the phone now, you should hear a dial tone. This will

sound like a continuous hum rather than an alternating tone.

Go back to the Asterisk Server Status page and dial an extension that

is marked as Free

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Exercise 2

Suppose now that have a University campus where the buildings are

connected to each other via WLAN. We now want to provide accessto the Asterisk server to those buildings using wireless.

Configure a Ubiquiti AP to connect to the wireless school AP so that

it allows the ATA to talk to the Asterisk server without NAT-ing.

Power off the ATAPlug the ATA into the Data port of the AP client and power it back on.

It should re-register with the Asterisk Server.

Friday March 5 2010