1. Download X-LITE  and install it :

http://www.tucows.com/preview/309984

2. Open X-LITE and click on the small down arrow and then on SIP Account Settings :



3. Click on Add… :



4. In the Account tab, enter your account information :



a. Display name : Your user name.
b. User name : Your user name.
c. Password : Your password
d. Authorization user name : your user name.
e. Domain : sip server

f. Click domain and NOT PROXY

5. Go to the Topology tab and enter stun.voipdiscount,com as the STUN server:



6. Click on OK and then Close.

7. If you have correctly followed the instructions, you should see the following message on the X-LITE display :