Question: What is the significance of the Application-ID value (16777349) for the St Application in Diameter commands, as per 3GPP specifications?
Option 1: It identifies the UE's (User Equipment) subscription profile.
Option 2: It specifies the QoS (Quality of Service) parameters for a particular service.
Option 3: It uniquely identifies the St Application in both the Diameter command header and Application-ID AVPs.
Option 4: It determines the routing path for Diameter messages between PCC nodes.
Explanation: The correct answer, Option 3, highlights the role of the Application-ID (16777349) in identifying the St Application within Diameter commands. This is crucial for proper command routing and processing, ensuring that messages are handled correctly by the intended application, which in this case is the St Application defined by 3GPP with a specific vendor identifier (10415). This understanding is vital for the configuration and troubleshooting of Policy and Charging Control (PCC) systems in telecom networks.