i'm 4 of those 100million "users". i've used skype about 3 times since free calling to US/Canadian numbers was ended.

An open-source SIP client would allow the tablet to be used as a voip phone connected to asterisk or to a voip service. It would be incredibly useful.

Did Tapioca SIP and minisip both give up? Why do these projects keep stalling? bad luck, high level of difficulty, or disincentives?