This problem affects versions 4.1(2) and lower.
For more information, refer to the Network Requirements for Cisco IP Communicator section of Preparing to Deploy Cisco IP Communicator.
For administrators, video capabilities can be enabled from the Cisco CallManager Administration page. To do so, perform these steps:
For FAQs about using VT Advantage, refer to Cisco Unified Video Advantage Q&As.
For additional information, refer to these documents: