The answer is D. Interactive Connectivity Establishment (ICE) is a protocol used to find the best media path between network elements in traversal calls. It does this by first discovering all possible paths between the two endpoints, and then selecting the path with the lowest latency and jitter. ICE is used by many different applications, including WebRTC, SIP, and H.323.
Here are the other options and why they are incorrect:
A. B2BUA stands for "Back-to-Back User Agent". It is a type of SIP proxy that sits between two endpoints and relays messages between them. B2BUAs are often used to keep firewall ports opened for inbound/outbound calls, but they do not use ICE to do this.
B. Mobile and Remote Access endpoints can connect video calls signaling peer-to-peer using a variety of protocols, including ICE. However, ICE is not the only protocol that can be used for this purpose.
C. Calling external endpoints with reduced overhead under VPN connections can be done using a variety of methods, including ICE. However, ICE is not the only method that can be used for this purpose.
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