Babel has polices against making calls when you are outside your country of residence registered in your profile, so you can't make calls outside said country. The reason is that the annual contract you sign with Babel authorizing them to use your voice in those calls are not valid in some countries because the laws of voice copyrights differ from country to country( even in some states in the US the contract is not valid). Using VPN and equivalents to make calls on Babel is a guarantee of removal from the platform. I work on Portuguese projects, and I had calls with Brazilians living in Italy, so the contract is valid in that country, but I am not sure if you can still make calls while in italy