Which option below is NOT typically a responsibility of the Cisco Unified Border Element (CUBE)?

• A. Media translation
• B. SIP normalization and interoperability
• C. NAT traversal
• D. Dial plan management

Answer: (D)

CUBE sits at the network edge to enable SIP trunking and interwork between internal and external networks. Its job is to handle signaling and media adaptations so calls can traverse borders and interoperate with different vendors.

Media translation is within its remit because CUBE may need to adjust codecs or negotiate media streams to match endpoints or service providers, ensuring the call can be understood on both sides.

SIP normalization and interoperability are core capabilities, as CUBE often fixes or adjusts SIP messages (headers, methods, compatibility quirks) so diverse implementations work together reliably.

NAT traversal is a common need for border devices, and CUBE provides strategies to keep signaling and media paths intact across NATs and firewalls, preventing call setup and RTP failures.

Dial plan management, however, is not typically handled by CUBE. The broader dial plan design belongs to the call-control layer (like CUCM or other PBX/gateway configurations), while CUBE uses dial peers and routing rules to connect those plans to external networks.