Implementing Cisco Collaboration Cloud and Edge Infrastructure (CLCEI) — Question 45

A company has enabled ICE to optimize call flows and improve video quality between their Cisco Collaboration endpoints internally and externally.
For which reason would you see activity on the TURN server when a call is established between two external endpoints?

Answer options

• A. The video call is using encryption, which is not supported by ICE with CUCM 12.5
• B. ICE cannot reduce the packet loss on the link
• C. A STUN cannot punch holes in the firewall
• D. The video call is using 4K resolution, which is not supported by ICE with CUCM 12.5

Correct answer: C

Explanation

The correct answer is C because STUN is designed to facilitate NAT traversal but may not succeed in creating openings in restrictive firewalls, necessitating the use of a TURN server for media relay. Options A and D are incorrect as they address capabilities of ICE and CUCM 12.5 that are not directly related to TURN server activity. Option B is also incorrect since ICE can help mitigate packet loss through various mechanisms, though it might not always succeed.