Question: What is the primary purpose of the SGSN - SMSC interface in a mobile network?
Option 1: To manage voice call routing between SGSN and SMSC nodes
Option 2: To handle subscriber authentication requests from SGSN to SMSC
Option 3: To facilitate Short Message (SM) submission from SGSN to SMSC and delivery from SMSC to SGSN
Option 4: To synchronize billing records between SGSN and SMSC entities
Explanation: The correct answer highlights the interface's role in enabling the exchange of Short Messages (SM) between the Serving GPRS Support Node (SGSN) and the Short Message Service Center (SMSC), ensuring seamless SMS services across the network.