If your using Gizmo to dial in and out yes it would cost money. But we're connecting Gizmo to Grand Central. And Grand Central is handling the in/out calls (and it's currently free for Grand Central). And since both are SIP operable (still don't understand it fully myself..just that it's an open protocal for voice to voice then let's say Skype) that means it's free to interchange voice calls inbetween the two services.