Asterisk, Trixbox, and the Linksys SPA 3102

I have finally completed my Asterisk installation, and have it working. Surprisingly, it was fairly painless. As I had indicated in an earlier post, I intended to get it working using a single incoming analog line, a Linksys Sipura 3000, and a fairly elderly PC. Much to my surprise, I was able to procure a 1.8 GHz Pentium IV machine for less than $200.00, and it works very, very well.

The Linksys Sipura 3000 had been replaced by the SPA 3102 by the time I got around to ordering one, so I bought one from http://www.voipdepot.ca (cheaper shipping, and overnight at that!) It arrived, and here's what I did:

Install Trixbox
This is trival. I downloaded the version 2.2.4 ISO from http://www.trixbox.org, burned a CD and inserted it into the drive on the PC I am using as a PBX. I rebooted, answered a few (obvious) questions, and let it do its thing. Two additional automatic reboots later, Trixbox was installed.
By default, the Trixbox install uses DHCP to get an IP address, and that's no good, so I logged in as root and set the IP address to a static one, so I'd know how to get there. Do this by typing "netconfig" at the prompt, as root, and give it an IP address. Now, reboot one final time.

Configure Trixbox
All configuration is done from a web browser. Assuming you chose 192.168.0.76 as the IP address for your Trixbox machine in the previous step, just fire up your favourite web browser and go there (http://192.168.0.76). We need to get to admin mode, so click on the "[ switch ]" link in the upper right hand corner. You will be prompted for a password. The default username/password combination is "maint/password". We'll change that later.

Now, Choose "FreePBX" from the "Asterisk" menu, and we are ready to start. A new browser window (or tab, depending on your browser) will open. Click on "Tools" in the top menu, and then "Modules" from the menu on the left. Click on "Check for updates online." Click on "Download all". Install all modules.

Now, we need to set up some trunks. In my situation, I have one hard line coming in (a physical telco line) and I'm using Vonage's softphone for an addtional, pure VOIP line. We'll do the hard line first. It's connected using the SPA 3102.

SPA 3102
This is fairly easy to set up. Plug it in, and connect to it using a crossover cable and a PC/Mac/whatever. Go to its built in web browser, and give it a static IP address. I chose 192.168.0.234. The web based admin is typical Linksys -- easy to use. Assuming the IP address you chose is the same as mine, go here: http://192.168.0.234/admin/

Note that there are no passwords set on the SPA 3102 by default. You'll probably want to change that.

I made the following changes to the SPA 3102's default configuration:

1) Remove all "Vertical Service Activation Codes" under Voice/Regional. They conflict with the codes we will use in Asterisk.
2) Under Line 1, Proxy/Registration, I set the Proxy to 192.168.0.76 (the IP of the trixbox machine)
3) On the same screen, I set DTMF Tx Method to Inband+Info
4) On the same screen, I set up the info for the extension we're going to set up in Asterisk shortly -- Display Name = your name, password to whatever you want for a password, User ID = the extension number you are going to assign to the phone hooked up to the SPA 3102.

All done.

Setting up Trunks
Now, let's set up a trunk for this in Asterisk. Back on the FreePBX window in your browser, click on "Setup" on the top menu, then "Trunks" on the left menu. There is a ZAP trunk there, but we'll ignore it. Add a SIP trunk.

Fill in the values as follows, modifying for your particular information as required:

Outbound caller id: "19995551212"
This is your caller id information.

Maximum channels: 1
Trunk Name: SPA3102
Peer Details:

allow=ulaw
canreinvite=no
context=from-pstn
disallow=all
host=192.168.0.234
insecure=very
nat=yes
port=5060
qualify=yes
type=peer

User Context: SPA3102_In

allow=ulaw
canreinvite=no
context=from-pstn
disallow=all
host=192.168.0.76
insecure=very
nat=yes
port=5060
type=user

Now save the info. Okay, we have a trunk. Let's add a method of dialing out to the outside world.

Adding Outbound Routes
Click on "Setup" in the top menu, then Outbound Routes in the left. You probably have a route called "9_Outside", so let's use that. If not, add one and name it 9_Outside.

All we have to do here is specify a dial patter. I want to use "dial 9 for an outside line", so I have this in the dial pattern box:

9|.

That was easy. Now pick SIP/SPA3102 as your trunk, and save your changes.

Next, we need to have a method of receiving calls, so let's add an extension.

Adding an Extension
This is trivial. Click "Setup" in the top menu, then "Extensions" in the left menu. Add an extension. Add a SIP extension. All you really need is the extension number, but voice mail is nice, so scroll down and add that info. Be sure to specify a password for voice mail, and for the extension! If you added extension info to the SPA3102 when you set that up, you might as well enter the same information here....

Save, and you are good do go. Now let's add an inbound route, so we can receive calls.

Adding Inbound Routes
This is fairly easy as well. Just click on "Setup" in the top menu, then "Inbound Routes" in the left menu. Add a route. We are just going to have one for now, and it will handle all calls. Just add a route with the DID info (and everything else) set to defaults (empty) and then under "Set Destination" (at the bottom of the screen) choose "Core" and select the extension you set up a few moments ago.

Change the Passwords!
You really should change the passwords for Trixbox. You will notice a couple of rather profound warnings in the web based admin tool, with links to how to go about changing them. I strongly recommend you do so.

Next time, I'll give details on how to hook Vonage's softphone up , as well as the Linksys SPA922 IP Phone. We'll configure it for use within the network, as well as an external (remote) extension.