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Collaboration, Voice & AV · Intermediate

Cisco Unified Border Element (CUBE)

Cisco's IOS XE session border controller that connects CUCM and Webex Calling to SIP trunk providers and other SIP networks.

Definition

CUBE runs on ISR and Catalyst 8000 routers or as virtual CSR/Catalyst 8000V instances and acts as a B2BUA for SIP-to-SIP and H.323-to-SIP calls. It provides demarcation, topology hiding, early-offer conversion, codec filtering, DTMF interworking, SIP header manipulation, TLS/SRTP, call admission control, toll fraud protection and high availability. It is also the Local Gateway for Webex Calling.

Example

voice service voip / mode border-element / allow-connections sip to sip enables CUBE functionality.

Exam tip

allow-connections sip to sip is required for SIP-to-SIP calls; CUBE is a B2BUA, not a proxy.

Related terms