How to setup Ozeki VoIP SIP SDK with FreePBX

This guide shows how you can connect Ozeki VoIP SIP SDK to your FreePBX. This solution gives you a brief explanation about how you can configure Ozeki VoIP SIP SDK to start building your own application.

Ozeki VoIP SIP SDK uses Voice over IP to establish phone calls. Using VoIP technology is less expensive than traditional phone services. With Ozeki VoIP SIP SDK you can view your registered phone line and your active phone calls. You can establish calls using the Softphone of the Demo Application. You can also select the codec to be used during the phone call.

This configuration guide demonstrates how you can connect Ozeki VoIP SIP SDK to your FreePBX.

System architecture

If you follow the configuration guide, you will have a telephone system that works as follows:
First, create an extension in your FreePBX. Ozeki VoIP SIP SDK will connect using this created extension. Once Ozeki VoIP SIP SDK Studio is connected, you can start your calls. The destination phone could be a VoIP phone, a land line phone or a mobile phone. You can see this process in Figure 1.

calling contacts via freepbx
Figure 1 - Calling contacts via FreePBX

  1. Ozeki VoIP SIP SDK registers to FreePBX.
  2. The call will be forwarded to FreePBX using the created extension.
  3. The destination phone will be ringing.
  4. You can start talking using the SDK.

Configuration steps

Before you start to configure this solution it is assumed that you have already installed your FreePBX and downloaded Ozeki VoIP SIP SDK installer from the download page.

Step 1.) Configure FreePBX

In this example I have installed FreePBX on a computer and its IP address is You can reach and configure FreePBX through its web interface. In order to configure FreePBX navigate to the IP address of your installation using your web browser and click on the PBX Administrator icon (Figure 2).

freepbx in your browser
Figure 2 - FreePBX in your browser

Login with as administrator with password you set during the installation (Figure 3).

login as administrator
Figure 3 - Login as Administrator

Once you logged in, click on Extensions (Figure 4).

click on extensions
Figure 4 - Click on Extensions

Now you can add an extension to your configuration. To do this, select Generic SIP Device from the Device list and click on Submit (Figure 5)

add a generic sip device
Figure 5 - Add a generic SIP device

Fill the User Extension, Display Name and the SIP Alias field, and scroll down the configuration form (Figure 6).

configuration fields
Figure 6 - Configuration fields

Provide the SIP password at the secret field. In this example it will be abc123 (Figure 7).

provide sip password
Figure 7 - Provide SIP password

Once it is done, click on Submit (Figure 8).

click on submit
Figure 8 - Click on submit

To apply the new extension, click on Apply Configuration Changes at the top of the page (Figure 9).

apply configuration changes
Figure 9 - Apply configuration changes

The changes will be applied by reloading the config file of the PBX. Click on Continue with reload.

reload configuration file
Figure 10 - Reload configuration file

Once it is reloaded, the configuration of FreePBX is done and you can configure Ozeki VoIP SIP SDK.

Step 2.) Configure Ozeki VoIP SIP SDK

In this example, I have already downloaded the installer into my computer from the download page. Open the downloaded package and execute the installer. Accept the License Agreement and click on Next (Figure 11).

install voip sip sdk
Figure 11 - Install VoIP SIP SDK

Wait until your Ozeki VoIP SIP SDK is installed (Figure 12).

installing voip sip sdk
Figure 12 - Installing VoIP SIP SDK

After installation, Ozeki VoIP SIP SDK Demo Application will be started automatically. To provide your FreePBX extension details in the Demo Application, fill the SIP Account Settings fields with the created extension data and click on Register. (Figure 13).

register to freepbx
Figure 13 - Register to FreePBX

After registration, the registered phone line will be visible in the Phone Lines section. For testing you can enter a number using the form and click on Pick up (Figure 14).

dial a phone
Figure 14 - Dial a phone

On Figure 15, you can see the Demo Application is calling the destination phone.

incoming call from the demo application
Figure 15 - Incoming call from the Demo Application

The active phone call is visible in the Phone Calls section (Figure 16).

active phone call
Figure 16 - Active phone call


Now the configuration is completed and the testing is successful. Now you can start to build your application with VoIP support. You can reach people at the lowest price possible using a VoIP system.

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