I have made significant progress with my VOIP over 3G experiment, and would say it's to the point where anybody could use it. My old configuration was Google Voice to Gizmo5 to a SIP app on my phone. The problem with this was G5 didnt integrate well with the SIP app, was unreliable and i would miss calls. Making calls was a pain, they were setup via browser and this was unreliable as well. I had wanted to hold onto gizmo5 as the SIP provider as G5 was the only SIP provider with direct integration with GV.
After much trial and error I arrived at an ideal solution. Incoming calls to GV are routed to the SIP provider sipgate, then to the sipswitch sipsorcery, and onto sipdroid running on my phone. Calls can be made directly on the handset dialer, as sipdroid integrates with the native dialer. When you place a call sipdroid contacts sipsorcery, and sipsorcery runs a script that contacts GV, making GV initiate the call. This is all very transparent to the user and once setup is indistinguishable from the typical call process. These are all free services, and i would highly suggest trying this out.
You may have read that Verizon is going to allow unlimited calls to and from Skype soon. Calls will be routed over the typical voice networks but will require data to initiate the calls. However, they will not allow Skype out calls to phone lines. My next project will be figuring out how to rout all calls through the Skype network without using Skype credits.
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