What Toktumi has done is build a back end similar to that of Google Voice — but unlike Google, it’s gotten Apple’s blessing. It’s one of the more complete mobile VoIP apps currently available for download; I especially like the fact that it allows you to receive calls straight to your mobile phone over a cellular network even if you don’t have 3G or Wi-Fi coverage. It comes with its own features such as call waiting, conference calling, call transfer and even voice mails — in other words, the service is like a virtual second line on your phone. The service costs $14,95 a month for unlimited calls in the U.S. and Canada.

Toktumi, which launched at DEMO 2008, has had to traverse a difficult path to get to where it is today, and Sisson is understandably excited about the kind of exposure the approval from Apple of its app will bring. Sisson, a veteran of the VoIP business, sold his last company, Teleo, to Microsoft.