1. Avaya Aura® Device Services Overview and Implementation, Release 8.1, (December 2020), Page 8, "Chapter 2: Solution overview".
The document states, "Avaya Aura® Device Services provides a single point of interface for managing Avaya devices... It provides the following services: ... File access service for endpoints to download firmware files, view files, and other types of files." This directly maps to the fileserver functionality of the former Utility Services.
2. Avaya Aura® Solution Description, Release 10.1, (FP2 June 2023), Page 27, "Avaya Aura Device Services".
This guide describes AADS as the component for "centralized management of Avaya endpoints." It details its role in providing configuration and firmware files, confirming it as the successor to Utility Services for these tasks.
3. Administering Avaya Aura® Communication Manager, Release 8.1, (November 2019), Page 711, "Chapter: Administering IP telephones".
While for an earlier version, this document details the transition of file server responsibilities. It states, "You can use an HTTP or HTTPS server to download the upgrade and settings files... Avaya recommends using Avaya Aura® Device Services as the file server." This recommendation is standard practice in subsequent releases like 10.1.x.