On an Avaya IP Office solution, the Administrator account provides access to administer Voicemail Pro and one-X Portal. The Administrator account is an account with full access to the system, allowing it to make changes to the system configuration and settings, including Voicemail Pro and one-X Portal. The Security, Root, and System accounts do not provide access to administer Voicemail Pro and one-X Portal.
Reference:
Avaya IP Office (https://www.avaya.com/en/solutions/ip-office/).
Avaya IP Office Voicemail Pro (https://www.avaya.com/en/solutions/ip-office/voicemail-pro/).
Avaya one-X Portal (https://www.avaya.com/en/solutions/one-x-portal/).

The Avaya Equinox Client uses two protocols to communicate with the Avaya IP Office: Transport Layer Security (TLS) and Transmission Control Protocol (TCP).
TLS: is a security protocol that provides communications privacy over the internet. It is used to secure the connection between the Equinox client and the IP Office.
TCP: is a transport protocol that is used to establish a reliable connection between the Equinox client and the IP Office. It provides a mechanism for error checking and data retransmission, which ensures that data is properly transmitted between the two systems.
Reference:
Avaya IP Office (https://www.avaya.com/en/solutions/ip-office/)
Avaya Equinox (https://www.avaya.com/en/products/avaya-equinox/)

In Voicemail Pro, the Menu Action should be used for creating an auto-attendant. The Menu Action allows you to create a menu of options for callers to choose from. The other available actions (Generic Action, Route Incoming Call Action, and Condition Action) are not used for creating auto-attendants.
Reference:
Avaya IP Office (https://www.avaya.com/en/solutions/ip-office/).
Avaya IP Office Voicemail Pro (https://help.avaya.com/DOCS/IP_Office/Server%20Edition/IPO_SE_Voicemail_Pro_EN.pdf).

The Avaya Equinox Client requires the 46xxsettings.txt file in an Avaya IP Office deployment to read the SIP values from the file in order to connect to the Avaya IP Office system. These SIP values can include the IP address of the Avaya IP Office system, the SIP port number, and the SIP user name. The Client does not use conference settings contained in the file to connect, nor does it write any SIP values into the file or log connections in the file.
Reference:
Avaya IP Office (https://www.avaya.com/en/solutions/ip-office/).
Avaya IP Office Equinox Client (https://www.avaya.com/en/solutions/ip-office/equinox-client/).