In a Cisco Contact Center Enterprise (CCE) and Customer Voice Portal (CVP) deployment, the Cisco Unified Border Element (CUBE) serves several critical functions at the network edge. It acts as a clear demarcation point (D) between the internal enterprise network and the external service provider network. For security and topology hiding, CUBE provides Network Address Translation (NAT) for address hiding (B), concealing the private IP addresses of internal components like CVP. Crucially, CUBE ensures interoperability by using SIP profiles to normalize SIP messages (E), modifying signaling headers and formats to resolve incompatibilities between the service provider's SIP implementation and the requirements of CVP.

A. Silent Monitor inbound voice calls: Silent monitoring is an application-level feature handled by Cisco Finesse, UCM, or dedicated recording platforms within the contact center solution, not a primary function of CUBE.

C. Record calls by forking the media using build-in-bridge: The term "Built-in-Bridge" (BIB) refers to a specific recording mechanism within Cisco Unified Communications Manager (CUCM) and certain IP phones, not CUBE. CUBE uses a different feature called "media forking".

D. Secure communication using flow around mode: This statement is incorrect. In "flow-around" mode, media bypasses CUBE, which reduces CUBE's ability to provide media-related security. Security is enhanced in "flow-through" mode, where CUBE processes both signaling and media.

1. Cisco Unified Border Element (CUBE) Data Sheet: "CUBE provides a network demarcation point between the enterprise and the service provider... Key CUBE functions include... security and interoperability." This supports options D (Demarcation) and E (Normalize/Interoperability). The security section implicitly covers address hiding.

Source: Cisco.com

"Cisco Unified Border Element Data Sheet".

2. Cisco Unified Contact Center Enterprise Design Guide: The guide consistently depicts CUBE at the edge of the network

interfacing with the PSTN/SIP Trunk provider and the internal CVP components. It explicitly states CUBE's role in "normalizing messages between the carrier and CVP."

Source: "Cisco Unified Contact Center Enterprise Design Guide

Release 12.x"

Chapter: Core Components

Section: Cisco Unified Border Element (CUBE). This supports options D (Demarcation) and E (Normalize SIP messages).

3. Cisco Unified Border Element Configuration Guide: "You can configure CUBE to provide network address translation (NAT) for signaling and media packets." and "SIP profiles on CUBE are a powerful tool for manipulating SIP messages... to achieve interoperability."

Source: "SIP Profile Configuration on Cisco Unified Border Element"

and "NAT Traversal for SIP on Cisco Unified Border Element" sections within the official CUBE Configuration Guides. This directly supports options B (NAT) and E (Normalize SIP messages).

4. Cisco Unified Communications Manager Features and Services Guide: This guide details the "Built-in Bridge for Call Recording" feature

specifying its implementation on Cisco IP Phones and its control by CUCM

confirming it is not a CUBE feature.

Source: "Cisco Unified Communications Manager Features and Services Guide"

Chapter: Call Recording

Section: Built-in Bridge for Call Recording. This confirms option C is incorrect.