I saw Salesforce released a new Developer Guide introducing Open CTI which is supposed to allow CTI integration without a desktop adapter.  Sounds exciting, but the Developer Guide seems to be missing some detail.

For instance, if I have no desktop adapter, something must takes its place to actually talk CTI to the telephony system.  I see that the field reqAdapterUrl is still required in the Call Center definition.  So what does it point to?  What's the rest of the CTI picture that I'm missing?