Question: In a mission-critical communication scenario involving interconnection with a partner MC system, where does the user authorization for an MC service user take place?
Option 1: Simultaneously in both the serving MC system and the partner MC system
Option 2: In the serving MC system of the MC service user
Option 3: Exclusively in the partner MC system for security enhancement
Option 4: Through a centralized external authorization server
Explanation: This is correct because, according to the specified telecom protocol for mission-critical services, when interconnecting with another MC system, the authorization process for the user of the mission-critical service is handled by the serving (or home) Mission Critical (MC) system that the user belongs to. This ensures seamless and secure integration while maintaining the integrity of the user’s profile and permissions within their primary network.