The first article of a OCS 2007 series about Voice and OCS 2007.
The first part in this series on Microsoft Office Communication Server (OCS) 2007 showed how OCS was built on the strengths of Live Communication Server (LCS) 2005 to deliverenhanced enterprise-class instant messaging (IM) and presence capabilities, as well as advanced media and phone functionality (see the February 2008 issue of TechNet Magazine at technet.microsoft.com/magazine/cc194409). This article continues with a deeper dive into the Voice over IP (VoIP) aspect of the story. I will explain how simple voice calls are made in the OCS system and discuss the technology layer by layer, so each component is added along with the corresponding functionality.
Read more at source: http://technet.microsoft.com/en-us/magazine/cc645016(TechNet.10).aspx