Yes - you can "call out" from either your phone access to grandcentral voicemail (call your own number, hit star, type a pin - then hit 2 after a message to call the person back, I think - which will return you to your voicemail when the call is done!) or click a "call" button online which rings the phone of your choice, then your chosen contact. This is the bit they say they might charge for once out of beta, since it's basically like a skype-out (you can add a Gizmo sip address as a line)