Where is my VoIP on iPhone?

The most amazing event to not happen in 2008 is how, after all the hype behind VoIP on iPhone, none of the major networks have a official application. Actually, scratch that, the most amazing event not to happen in 2008 is how, after all the hype behind VoIP on iPhone, there is still no plain SIP application to be released (other than the terribly lacking, do-everything-poorly Fring). I mean GizmoProject has applications for every other device out there, yet they have not talked about doing a iPhone application. There is incredible demand for such an application specially if it is paired with some sort of multi-ring solution such as the now hidden (dead?) Grand Central. I do not understand why this application is not available. Fring is out, and it has SIP calling, but it inexplicably doesnt have a keypad on the call screen so any of the applications that ask you to press any key are unusable. Calling your bank? Sorry! If you could get a Grand Central number (sigh... Grand Central) you could connect to Gizmo5 and have your Grand Central number ring your Gizmo5 number on your iPhone. Imagine that. You don't give out your mobile phone number and people would be able to call you anywhere you are as long as you are in WiFi range. Perhaps the main failure here is actually Apple's. There is no way to have the phone have a background process that would be able to recieve the call unless you run the application and then lock your phone. Until then, I think there's a huge oportunity for whoever comes out to market first. Figure the background process later.