total beginner

[bracca]

Hi,

I am so confused as to who plays what role in this whole SIP VoIP thing.

All I know is that I want to use my Android to make free or very cheap calls within the from the U.S. to the U.S. and to Europe.

I do not understand the role of Voxalot. Is Voxalot a SIP provider, a middleman, both? If middle man, who is the "final" man?

Is there a tutorial that explains what Voxalot does and what else I need to do what I want (free or very cheap calls within the from the U.S. to the U.S. and to Europe)?

Thank you,
bracca