Question: In a Mobile Application Part (MAP) specification, when using the Short Message Gateway context for procedures, what role typically assumes the Responder if the Initiator is a Gateway Mobile Switching Center (GMSC)?
Option 1: Visitor Location Register (VLR)
Option 2: Home Location Register (HLR)
Option 3: Serving General Packet Radio Service (GPRS) Support Node (SGSN)
Option 4: Mobile Switching Center (MSC)
Explanation: In the context of Short Message Gateway procedures within MAP specifications, the Responder's role is dependent on the Initiator's identity. Specifically, when the Initiator is a GMSC (Gateway Mobile Switching Center), the Responder typically assumes the role of the HLR (Home Location Register). This is because the HLR is responsible for managing subscriber data and is logically involved in gateway procedures initiated by a GMSC for short message handling, ensuring proper routing and delivery.