To configure your Aastra 51i, plug the phone into a power outlet and connect it to an IP network. You will need a PC connected on the same network to access the web configuration menu. The phone should boot up and connect to the network automatically.

1. Find the IP address of the Aastra phone by pressing the keys on your handset as follows:
   - Press the Services key
   - Press the scroll down button 5 times to reach Options, press the scroll right button to confirm selection
   - Press the scroll down button twice to reach Phone Status, press the scroll right button to confirm selection
   
   The IP address of your phone will appear on the handset screen.
2. Enter the IP address found in Step 1 as a URL using a web browser on your PC. The URL would look like: https://
   
   Your web browser will display a security alert window. This is expected, confirm that you wish to continue accessing the web page.
3. You will be prompted for a username and password. You will require Administrator access to configure VoIPtalk service details. The access details are:
   Username: Admin
   Password: 22222
   
   You should see the status screen online once you login.
4. On the left menu section of the screen click on Global SIP, under Advanced Settings.
5. Enter the configuration details as shown in the image below.
   
   Screen Name & Screen Name 2: enter a value of your choice
   Phone Number: enter your VoIPtalk ID
   Caller ID: usually an inbound number or your VoIPtalk ID
   Authentication Name: enter your VoIPtalk ID
   Password: enter your VoIPtalk password. (To retrieve your VoIPtalk password go to your account page and click on your VoIPtalk ID).
   Proxy Server: enter voiptalk.org
   Proxy Port: enter 5060
   Outbound Proxy Server: enter nat.voiptalk.org
   Outbound Proxy Port: enter 5065
   Registrar Server: enter voiptalk.org
   Registrar Port: enter 5060
   
   Click on the Save Settings button on the bottom of the screen. Your phone will confirm the changes and advise you to restart your phone.

   

6. To restart your phone, click on the Reset option under the Operations section on the left-side menu. Click on the button Restart. The phone will automatically restart.

   

Once the phone has completed its boot up sequence, simply dial 902. You should hear the confirmation message announcing successful configuration of your phone. Congratulations!