Which telephony deployment is between a TDM trunk and a VOIP?

The correct answer is B. CUBE. CUBE (Cisco Unified Border Element) sits at the network edge and acts as a session border controller, serving as the demarcation point between a TDM-based PSTN trunk and an enterprise VoIP network - handling protocol interworking, media transcoding, and security at that…

Advanced Features and Integration Implementation

Question

Options

ACUCM
BCUBE
CVoice gateway (VGW)
DCUSP

How the community answered

(41 responses)

B
95% (39)
C
2% (1)
D
2% (1)

Explanation

CUBE (Cisco Unified Border Element) sits at the network edge and acts as a session border controller, serving as the demarcation point between a TDM-based PSTN trunk and an enterprise VoIP network - handling protocol interworking, media transcoding, and security at that boundary. CUCM (A) is a call-processing platform (software PBX) that lives entirely within the VoIP domain and does not bridge TDM to VoIP. Voice Gateway (C) performs analog/digital TDM-to-VoIP conversion for local endpoints (like FXS/FXO ports or PRI interfaces), but it functions as a protocol converter within the network rather than as the border element between a carrier TDM trunk and an enterprise VoIP environment. CUSP (D) is a SIP proxy that operates purely in the IP/VoIP space and has no TDM role whatsoever.

Memory tip: Think of CUBE as the "customs checkpoint" at the border between the legacy TDM world (carrier side) and the modern VoIP world (enterprise side) - the word Border is literally in its name: Cisco Unified Border Element.

Topics

#CUBE#TDM/VoIP bridging#Gateway interoperability#Voice integration

Community Discussion

No community discussion yet for this question.

Full 500-444 Practice