This term describes a user whose call processing is controlled by Avaya Aura® Communication Manager Feature Server or Evolution Server in the enterprise core. During normal operation, the Centralized user gets their telephony features and services from core applications such as the Communication Manager Feature Server or Evolution Server. Through the core Avaya Aura® Session Manager, the Centralized user can also access local PSTN trunks and services, such as local paging, local auto-attendant, and local Meet-me conferencing, on the IP Office in the branch. If WAN connectivity to the Avaya Aura®Session Manager is lost, the Centralized user automatically gets basic services from the local IP Office. When connection to Avaya Aura®Session Manager is available again, failback occurs either automatically or by manual administrative action where call processing for the Centralized user is returned to being controlled by Avaya Aura®Session Manager.

A Centralized user must be configured on the Avaya Aura®Session Manager, on Communication Manager, and on the IP Office. On the IP Office, the Centralized user must have either a SIP extension or an analog extension. There are two types of Centralized users: