Via Pat Phelan, I signed up telEvolution Inc. for the Beta. We’ll see if we hear back or if they accept us.
It looks like Skype For SIP supports calling from Skype into a SIP PBX, but not calling a Skype user (free call) from a SIP PBX. It supports placing calls from SIP using SkypeOut, though, so we’ll see.
UPDATE: via Skype Journal, I see that “Skype for SIP” maps one Skype username to one IP address (SIP address?) – this is basically for “Skype Me” buttons and to let Skype users ring your PBX.
It also lets a businesses use SkypeOut for outgoing calls. As Phil notes, Skypeout rates are higher than what businesses can already get from typical SIP termination providers, so I’m not sure what the win is there.
So, all in all, “Skype for SIP” is not the SIP interoperability everyone is asking for. For better SIP/Skype interoperability, we still need to turn to third parties like OpenSky. On the other hand, while “Skype for SIP” appears to be a pretty small step toward Skype/SIP interoperability, it is at least a step, and we should give them some credit for that.