Question: In EPS (Evolved Packet System) or GPRS (General Packet Radio Service), what does the presence or absence of a Short-Term Mobile Subscriber Identity (STN-SR) data in the Home Subscriber Server (HSS) indicate about a user's subscription?
Option 1: The user's SRVCC (Single Radio Voice Call Continuity) subscription status, which is independent of the STN-SR value itself.
Option 2: The user's current network attachment (EPS or GPRS).
Option 3: The user's data roaming capabilities.
Option 4: The user's voice call service package details.
Explanation: In the context of EPS or GPRS, the presence or absence of STN-SR data in the HSS specifically signals whether a user is subscribed to SRVCC or not. This indication is independent of the actual value of the STN-SR, highlighting its role as a subscription status indicator rather than conveying other types of subscriber information.