This is one of the exciting server role for Microsoft Office Communications Server 2007 Standard edition as well as Enterprise edition. It provides near real-time monitoring and service assessment of the IP voice media quality. With QoE Monitoring Server, you can do the following:
The QoE Monitoring Server collects quality metrics at the end of each VoIP call from the participant endpoints, including IP phones, Microsoft Office Communicator 2007, the Microsoft Office Live Meeting 2007 client, and Microsoft Office Communications Server 2007 A/V Conferencing Server and Mediation Server. These quality metrics are aggregated and stored in a SQL database. The data can then be used to alert you to abnormal media quality conditions and also to generate routine media quality reports.
So, I would like to suggest that you donwload the software and then read up the excellent documentation. To download, please click the following link: http://www.microsoft.com/downloads/details.aspx?FamilyID=09115944-625f-460b-b09c-51e3c96e9f7e&DisplayLang=en
You can find technical detail documentation from TechNet: http://technet.microsoft.com/en-us/library/bb963966.aspx