Explanation
An enterprise-focused Session Border Controller (SBC) providing voice and video connectivity from the enterprise IP network to service provider SIP trunks is Cisco Unified Border Element (CUBE). CUBE is a Cisco IOS software application that acts as a network border element between two or more VoIP networks, providing interconnectivity, security, and transcoding1. CUBE can be deployed on Cisco Integrated Services Routers (ISRs), Cisco Aggregation Services Routers (ASRs), or Cisco Cloud Services Routers (CSRs) in the enterprise network edge1. CUBE enables enterprises to use SIP trunking services from service providers, as well as interconnect their on-premises or cloud-based unified communications systems with other SIP networks1. CUBE also supports various features such as call admission control, media flow-through or flow-around, quality of service, and media recording1.
CUCM, CVP, and DNIS are not valid options for this question. CUCM stands for Cisco Unified Communications Manager, which is a call processing system that provides call control, device management, and user administration for Cisco IP telephony and video solutions2. CVP stands for Cisco Unified Customer Voice Portal, which is an interactive voice response system that provides self-service and call routing applications for contact centers3. DNIS stands for Dialed Number Identification Service, which is a feature that identifies the number dialed by the caller and passes it to the destination device. None of these products or features act as an enterprise-focused SBC providing voice and video connectivity from the enterprise IP network to service provider SIP trunks.
References: Cisco Unified Border Element Configuration Guide1, Cisco Unified Communications Manager Overview2, Cisco Unified Customer Voice Portal Overview3, Dialed Number Identification Service