Thanks for your reply...I tried to refresh my ip address using turn off the router few hours and got a new ip adrress but not helped...Yet got success to make a phone call after using VPN...I'll use like this for now and keep try to find out real solving the problem...and if nothing works I'll change the ISP...There are a lot of people having same problem to use internet phone to make a phone call to Korea around my area...
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