VoipCheap.com is one of very cheap voip service provider. I am attaching below small description how to configure Ekiga to use this service.

So, after installing and run of Ekiga (we can skip Tutorial / Wizard) we are selecting Edit -> Accounts. There, in accounts menu take add and configure it as below (replacing your_login with your VoipCheap.com login).

 If you don't have account, you can register thorugh web interface here: https://www.voipcheap.com/en/websignup.php

To connect with phone number, you have to type it with following @sip.voipcheap.com, for example to connect with MBank's MLinia call:

sip:+48783300800@sip.voipcheap.com