Question: In IMS (IP Multimedia Subsystem) supporting next-hop monitoring of overload, how do IMS entities (e.g., S-CSCF) provide overload control feedback to their neighbors?
Option 1: By sending periodic SIP INVITE requests with modified headers indicating load status.
Option 2: Through dedicated TCP connections for continuous load updates.
Option 3: By providing load reduction directives within SIP responses.
Option 4: Using SMS notifications to alert neighboring nodes of overload conditions.
Explanation: Providing load reduction directives within SIP responses is a direct and efficient method for an IMS entity like S-CSCF to communicate its overload status to neighboring nodes, allowing them to adjust traffic flow accordingly without introducing additional overhead or requiring separate communication channels.