User interface only
They will provide an open-source GUI that talks to a "binary blob" that does the actual voice over IP stuff.
Skype for Linux will be open sourced at some point in "the nearest future." Word of the open sourcing first arrived from French blogger Olivier Faurax, and it's now been confirmed by Skype itself. In a back-and-forth to Skype Customer Support about the possibility of a Skype-supporting RPM package manager for the Mandriva …
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I helped on the Beta versions of "Skype for Asterisk", and Digium and Skype held onto the actual core code VERY tightly. Now Digium are selling the Skype for Asterisk module, for $66 a time.
I REALLY can't see Skype giving access to their core engine, or that would well piss off Digium, because in a few days there would be a free Asterisk->Skype module. It's what a lot of us are after. Both for home use (I for example have my landline going into Asterisk, along with a UK IAX number, and a Google Voice connection), and as something we can offer to clients that have an Asterisk PABX.
Being based in Spain, working with English clients, being able to mix Skype into a PABX is the Holy Grail. I am offering Skype for Asterisk from Digium, but in these financially hard times, $66 is still annoying. Seriously, it is! If I could offer that function for free and do any support on a call-out basis, Skype would get a LOT more clients. Most of my clients have Skype on their PC's at the moment for calls back to the UK, and everything else through Asterisk. To integrate Skype into Asterisk, all calling could be 'managed' properly.
I doubt Skype will give us the full code though, so thats a FAIL. PLEASE God (if there is one) let me be proved wrong!!