[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-08

Real-time communications are sensitive to the latency and packet loss that can occur on congested networks. Call Admission Control (CAC) functionality (also known as bandwidth management) has been added in Communications Server 2010 to help prevent poor quality of experience for users on congested networks. CAC determines, based on available network bandwidth, whether to allow real-time communications sessions to be established. CAC can also provide an alternative route for calls when the preferred route does not have the required bandwidth. The alternative route could be by way of PSTN, or the Internet over the Edge Servers.