To use Avaya one-X Agent for H.323 voice or video call, you must have an extension that is properly administered for Avaya one-X Agent on a media server running one of the following version of Communication Manager:
Communication Manager Release 2.x and higher (voice only)
Communication Manager Release 4.x and higher (voice and video)
Avaya Video Telephony Solution
If you want to use the video feature, you must have any one of the following software packages: