300-820 · Question #150
What is a description of an Interactive Connectivity Establishment?
The correct answer is D. It is used to find the best media path between network elements in traversal calls. Interactive Connectivity Establishment (ICE) is an IETF standard (RFC 8445) that uses STUN and TURN to discover and test multiple candidate network paths (host addresses, server-reflexive addresses via STUN, and relayed addresses via TURN) between two endpoints. ICE then…
Question
What is a description of an Interactive Connectivity Establishment?
Options
- AIt is used by B2BUA to keep the firewall ports opened for inbound/outbound calls.
- BIt allows Mobile and Remote Access endpoints to connect video calls signaling peer-to-peer.
- CIt allows calling external endpoints with reduced overhead under VPN connections.
- DIt is used to find the best media path between network elements in traversal calls.
How the community answered
(39 responses)- A3% (1)
- B3% (1)
- D95% (37)
Explanation
Interactive Connectivity Establishment (ICE) is an IETF standard (RFC 8445) that uses STUN and TURN to discover and test multiple candidate network paths (host addresses, server-reflexive addresses via STUN, and relayed addresses via TURN) between two endpoints. ICE then negotiates and selects the best available media path, minimizing unnecessary media relay. In traversal scenarios (e.g., Expressway calls), ICE determines the most direct viable path for RTP media. It is not used to keep firewall ports open (that is STUN keepalives), nor is it specific to MRA peer-to-peer signaling or VPN optimization. Answer D is correct.
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