What is the purpose of a CUBE in Cisco collaboration deployments?

• A. Provide SIP interconnect, security, and PSTN/ITSP border control.
• B. Manage user directory and voicemail storage.
• C. Route inbound SIP only.
• D. Act as a media gateway for video transcoding.

Answer: (A)

The function being tested is that the Unified Border Element acts as the voice border at the edge of the enterprise, handling SIP interconnect with external networks and enforcing security and control over those borders. It sits between your internal Cisco Collaboration components and external networks such as service providers or the PSTN. Its role is to manage how calls cross the boundary, including signaling interworking, dialing plan and digit manipulation, and routing decisions for both directions. It provides security measures for border traversal—encryption for signaling and media (TLS/SRTP), topology hiding, and firewall-like controls—so external networks can connect safely. While it can handle media tasks like transcoding if needed, the core purpose is to enable trusted SIP interconnection and border control with PSTN/ITSP networks.