Avaya One-X Communicator is for Aura.
Avaya Communicator is used for IP Office.
Confusing, yes, maybe that's why the Communicator 3.0 is renamed to Equinox which has a MacOS version, guessing it will come down to IPO eventually.
For Mac you have the old Avaya Video Softphone which is on the Admin CD under the Softphone directory.
This requires the following licenses
License Requirements
Use of IP Office Video Softphone requires the following IP Office system licenses:
• System Licenses
Non-IP Office Server Edition systems must have Essential Edition and Preferred Edition licenses.
• User Licenses
Users can only be enabled for softphone usage by first setting their profile to Power User or Teleworker. These are user modes licensed by the following licenses:
• Power User license.
• Teleworker license.
• Application License
Version 4.0 softphone requires an Avaya Mac Softphone license.
"Trying is the first step to failure..." - Homer