Free call via Internet with use Zoiper, XLite
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.