An alternative is to use the free standard SIP. It´s not difficult to create a free account to make voice and video calls.
MicroSIP is a light application which will allow us to make calls through any SIP account. You´ll be able to create a contacts list and personalize your call tone between multiple options.
It´s a great application for its small impact on the system and its great portability, being able to use it with multiple SIP servers.