Question: What are the primary functions supported by the SIP Application Server (SIP AS) on behalf of Mission Critical (MC) services in a telecommunications network?
Option 1: Managing User Equipment (UE) mobility and handling voice call setup.
Option 2: Influencing and impacting the SIP session, as well as supporting event subscription and event notification.
Option 3: Providing Quality of Service (QoS) guarantees for data transmissions and optimizing network throughput.
Option 4: Authenticating users and authorizing access to non-mission-critical services.
Explanation: In the context of Mission Critical (MC) services, which demand high reliability and performance, the SIP Application Server plays a crucial role. Its primary functions include influencing and impacting Session Initiation Protocol (SIP) sessions to ensure seamless communication, and supporting event subscription and notification to keep all stakeholders informed in real-time. These functions are vital for the coordination and execution of mission-critical communications, such as those used in emergency response or public safety scenarios.