Hi guys,I want to make VOIP calls between India and Saudi Arabia. I want to know if buying two SIP phones (hardware) and placing one in each country will be enough to do this or do I have to subscribe for the VOIP service from some service provider who will bill me on a per minute basis? If the VOIP service provider is not necessary to make such calls, then will the calls made using only the hardware SIP phones be free?thanks,rational