Cisco Meeting Server is a software application that provides scalable, secure, and interoperable video, audio, and web conferencing on premises or in the cloud1.
Cisco Meeting Server has several components that can be enabled to expand the functionality of the server, such as2:
Web Bridge: This component provides web-based access to meetings using WebRTC or Cisco Meeting App.
Load Balancer: This component distributes the load of incoming calls and web requests across multiple Call Bridges and Web Bridges.
TURN Server: This component provides firewall and NAT traversal for media streams using the TURN protocol.
H.323 Gateway: This component provides interworking between different communication protocols, such as SIP, H.323, and WebRTC.
SIP Edge: This component provides secure SIP signaling and media encryption for external endpoints and servers.
Call Bridge: This component hosts the conferences and provides transcoding, layout, and recording services.
XMPP: This component provides chat and presence services using the XMPP protocol.
The component that is used for interworking between different communication protocols is the H.323 Gateway2. The H.323 Gateway allows Cisco Meeting Server to communicate with endpoints and servers that use different protocols, such as H.323, SIP, or WebRTC. The H.323 Gateway can also provide protocol conversion, media encryption, and bandwidth management for the interworked calls2.
Therefore, the correct answer is D. H.323 gateway.
References := 1: Cisco Meeting Server - Overview 2: Cisco Meeting Server Deployment Guide (2.9)
