Currently in testing, a promising new application could provide the best solution to making those calls.

Dubbed RingFree this program offers the ability to make calls through a variety of VoIP SIP providers using normal voice calls on the AT&T GSM network, or any other standard iPhone voice provider.

The method is similar to the one used by Talkety, where calls are routed through an external server instead of through the iPhone’s data connection, but it allows the use of any designated VoIP provider or your own server and doesn’t require you to receive a call in order to make one. Cool, eh?

A user registers with RingFree, entering his iPhone number and providing some other information. The user is then prompted to call a country-local number to confirm their information by entering a PIN. Once logged into the site, the user selects from a list of pre-defined VoIP providers or defines their own by entering a proxy address, username and password.

Once you are finished with that, you will see a familiar screen - a screen that looks like the iPhone’s dial pad. You are then able to dial a number! RingFree also lets you make calls to Google Talk and MSN voice accounts.

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