[leonidm]

Google Voice currently only works in USA. While you are in US just install GV, run it and configure to send all calls to GV. try placing a call, it should go through GV. This however may or may not work outside of the US (there are some mixed reports from different countries, and I just came back from Russia where GV did not work) Skype is your bes bet, just get some skype-out credit and give it a try. Fring might be another option. thirtd option could be SIP, just get a SIP account and SIP software and configure it ( I use broadvoice and acrobis softphone) - none of those are free, btw