How to make voip calls on a Symbian 9 S60 V3 Nokia phone using a vpn on a broadband connection?

I have a Symbian 9 S60 V3 Nokia N82 phone and also a vpn connection on a broadband of 1 MBPS. Can you suggest any available mobile software, which I can download/buy to install on the phone and make VOIP calls?

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