A template is being persistently pushed to the endpoint from TMS. This is because TMS, or Cisco TelePresence Management Suite, is a software application that enables centralized management of Cisco video conferencing and collaboration devices and systems. TMS can use templates to configure and update multiple endpoints with the same settings, such as alias information, network settings, security settings, and so on1. If a template is applied to an endpoint, any manual changes made to the endpoint will be overwritten by the template settings the next time the template is pushed by TMS2. Therefore, if an administrator notices that the alias information changes revert back to their original state the following day, it is most likely that a template is being persistently pushed to the endpoint from TMS.

The other options are not correct because:

The changes are not being saved properly on the endpoint: This is not likely, as the changes are successful and visible on the endpoint until the next day. If the changes were not saved properly on the endpoint, they would not take effect at all or would be lost after a reboot or power cycle of the endpoint3.

A template is being pushed persistently to the endpoint from the Expressway: This is not possible, as the Expressway does not support pushing templates to endpoints. The Expressway is a network device that provides firewall traversal, NAT, and encryption services for video communications. The Expressway does not have the capability to configure or update endpoints with templates.

The alias information of the endpoint is duplicated on another endpoint: This is not relevant, as the alias information of the endpoint is not affected by the alias information of another endpoint. The alias information is a unique identifier for the endpoint that is used for registration and dialing purposes. The alias information of another endpoint does not overwrite or interfere with the alias information of the endpoint in question.

References := 1: Cisco TelePresence Management Suite Administrator Guide (15.16) - Templates [Cisco TelePresence Management Suite] - Cisco 2: Cisco TelePresence Management Suite Administrator Guide (15.16) - Applying Templates [Cisco TelePresence Management Suite] - Cisco 3: Cisco TelePresence Management Suite Administrator Guide (15.16) - Configuring Endpoints [Cisco TelePresence Management Suite] - Cisco : Cisco Expressway Basic Configuration Deployment Guide (X12.6) - Introduction [Cisco Expressway Series] - Cisco : Cisco Expressway Basic Configuration Deployment Guide (X12.6) - Registering Aliases [Cisco Expressway Series] - Cisco