The Monitoring Server collects data about the quality of the network media, in both Enterprise Voice calls and A/V conferences. This information can help to provide the best possible media experience for the users. It also collects Call Error Records (CERs), which can be used to troubleshoot failed calls. Additionally, it collects usage information in the form of Call Detail Records (CDRs) about various Lync Server features. These metrics can be used to calculate return on investment of the Lync deployment, and plan the future growth.

Monitoring Server Scalability

One physical Monitoring Server can support up to 250,000 users if not collocated with Archiving Server. If collocated, it can support up to 100,000 users.