The servers bridge the call to Skype's Internet network.

FORBES: Skype Your Cellphone

"YOU ARE ABOUT TO call overseas using RSL Communications' Delta Three Internet network, " squawks the speakerphone in Itzhak Fisher's office.

FORBES: Srpska calling

"You are about to call overseas using RSL Communications' Delta Three Internet network, " squawks the speakerphone in Itzhak Fisher's Manhattan office.

FORBES: Srpska calling