300-070 Question #45: Real Exam Question with Answer & Explanation

The correct answer is B: H.323 and SIP interworking. The Cisco Unified Border Element (CUBE) is a router-based SIP/H.323 session border controller. Its core functions include: (B) H.323 and SIP interworking - CUBE can translate signaling and media between H.323 and SIP endpoints, enabling protocol interoperability. (D) Transcoding

Question

Which three are functions of Cisco Unified Border Element? (Choose three.)

Options

Aclient registration
BH.323 and SIP interworking
CLync interworking
Dtranscoding
Ephone proxy
Fmobile and remote access

Explanation

The Cisco Unified Border Element (CUBE) is a router-based SIP/H.323 session border controller. Its core functions include: (B) H.323 and SIP interworking - CUBE can translate signaling and media between H.323 and SIP endpoints, enabling protocol interoperability. (D) Transcoding - CUBE can invoke DSP resources to convert audio codecs (e.g., G.711 to G.729) when endpoints cannot agree on a codec. (E) Phone proxy - CUBE supports phone proxy functionality, allowing remote IP phones to register securely through a firewall by acting as a media and signaling proxy. Client registration (A) is a gatekeeper or CUCM function. Lync interworking (C) and mobile/remote access (F) are primarily Cisco Expressway functions.

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