If you are looking for older versions (like IP Office 9 or 10) because you are hesitant to upgrade, be aware that Avaya released critical security patches in late 2021.
If you're looking for a completely free solution, consider using an open-source alternative to Avaya IP Office Manager 11.1. One popular option is: avaya ip office manager 111 download free 2021
Avaya IP Office Manager 11.1, released in early 2020, marked a significant shift toward cloud integration and simplified administration for the mid-market segment If you are looking for older versions (like