Rather than bicker over what “open” means and whether Skype is open or not, Michael Robertson has just ignored the whole thing and taken action instead.
Today, Gizmo5 launched OpenSky, a SIP to Skype gateway. if you want to call a Skype user named echo123 you simply call SIP address sip:firstname.lastname@example.org
The free version can be used by anyone for calls up to 5 minutes long. For longer calls, you need to use their paid service, which is $20 per year for individuals.
I guess this will test Skype’s claim that no one is asking for this service.