Question: What is the primary benefit of deploying a STUN (Session Traversal Utilities for NAT) server in an IP Multimedia Subsystem (IMS) network, according to its optional utilization?
Option 1: To minimize the need for STUN Relay server resources by enabling User Equipment (UEs) to directly exchange media across most NAT types.
Option 2: To enforce strict security policies for incoming SIP (Session Initiation Protocol) requests from untrusted networks.
Option 3: To provide Quality of Service (QoS) guarantees for real-time communication sessions initiated by UEs behind NATs.
Option 4: To simplify the configuration of firewalls in the network to allow IMS signaling.
Explanation: The correct answer highlights the key advantage of using a STUN server in an IMS context. By allowing UEs to discover their WAN-facing transport address when behind a NAT, a STUN server facilitates direct media exchange between UEs for most NAT types, thereby reducing the reliance on STUN Relay servers and their associated resources.