Ensure that you have the following prerequisites:
Avaya Cloud Office™ user details. See Setting up the ACO user phone details.
Avaya Cloud Office™ certificate files. See Downloading the ACO certificates.
IP Office license file including:
An ACO System for the system.
An ACO User instance for each Avaya Cloud Office™ analog extension user.
If using a local PRI trunk as the emergency line, the license file may also need an IP500 Universal PRI (Additional channels) license.