Free calls at the network OPTIROAM, i.e. between VoIP lines OPTIROAM. For make free calls, you need to register twice on OPTIROAM or buy additional VoIP line.
Home can be a computer with softphone or any IP phone that allows to make calls via the Internet. To trip you take a laptop with any softphone. Then, in any place where there is a connection to the Internet, run the program and call your family.