# Enterprise requirements

## Communication Manager

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:

- Avaya Video Telephony Solution 3.0

- Avaya Video Telephony Solution 4.0

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