Hello?
If you're so inclined, you may now certify on OCS. It takes one exam to earn Microsoft Certified Technology Specialist (MCTS): Office Communications Server 2007. This is one of the cool things of our "new generation" certifications - we want people to be able to get certified on very specific technologies... then you can add more, or not, depending on what makes sense for you. The one exam in question is Exam 70-638: TS: Microsoft Office Communications Server 2007, Configuring. A prep guide is in the works, but in the meantime:
Installing and Managing Office Communications Server (OCS) 2007 (20%)
Deploying and Configuring OCS 2007 Clients (19%)
Configuring Conferencing (15%)
Configuring Enterprise Voice Functionality (14%)
Configuring External Connectivity (18%)
Monitoring and Maintaining OCS 2007
End of post mini-quiz: what do you get if you add 20+19+15+14+18?
A. 100
B. Not 100, wtf