Microsoft Unified Communications Managed API 1.0 SDK Public Beta - Now Available on Public Downloads
The UCMA API is up on the public downloads site! The UCMA library is used to write SIP servers for broadcast IM, query response bots, etc. used managed code (C# or VB.NET).
This is the API that I used in my UNC340 session at TechEd. I'll post the slides and code from that session later today.
Check it out!