One of our customers today asked about licensing of OCS Speech Server. Speech Server is part of OCS 2007 and requires a server license (Standard or Ent) and may also incur cost of CALs. When do I need CALs, when the application requires authentication for end users. So if most are external unauthenticated users and I have three internal users then I need three CALs. If the application is for External Callers and they are authenticated then I need either Std/Ent CALs or External Connectors. This is a considerable cost savings in comparison to 3rd party IVR platforms. Here's a chart that shows when/what licensing is needed for Speech Server.