The primary function of the Avaya Session Border Controller for Enterprise (SBCE) in a remote worker deployment is to provide secure, application-layer connectivity for SIP-based unified communications. It creates a secure tunnel for signaling (via TLS) and media (via SRTP) between the remote endpoint and the corporate network. This architecture provides robust security, including topology hiding and denial-of-service protection, specifically for UC traffic, thereby eliminating the requirement for a traditional, full-tunnel Virtual Private Network (VPN) client for voice and video services.

A. The dial plan is configured in Avaya Aura® Communication Manager and is consistent for a user regardless of whether they are in the office or remote.

B. SBCE is a security gateway; it does not limit telephony features. Remote Workers have access to the same feature set provided by Communication Manager as Office Workers.

D. SBCE can be configured to securely proxy HTTP/HTTPS requests, allowing remote phones to connect to internal file servers (like AADS) to download new firmware and configuration files.

1. Avaya Session Border Controller for Enterprise R10.1.0 Overview and Specification (NN43001-111), Page 13, Section: "Remote Worker".

The document states: "The Remote Worker feature of Avaya SBCE provides secure remote access to Avaya Aura® for SIP endpoints without requiring a Virtual Private Network (VPN) connection." This directly supports the correct answer (C).

2. Administering Avaya Session Border Controller for Enterprise Release 8.1 (Document number 16-603836), Page 21, Section: "Avaya SBCE features and benefits".

It lists a key benefit as: "Secure connectivity for remote workers without the need for a VPN client." This further validates answer C.

3. Avaya Aura® Communication Manager Feature Description and Implementation (555-245-207), Chapter: "Overview of Features".

This document details that features are assigned to stations, COR, and COS within Communication Manager. The access method (local LAN vs. remote via SBCE) does not inherently change the available feature set, making option B incorrect. The dial plan (ARS/AAR) is also a core CM function, making option A incorrect.