Question: In an IMS deployment using both GPRS and EPS to access IMS via GERAN/UTRAN radio access, how are IP-Connectivity Access Network bearers provided and mapped for a User Equipment (UE) connected to EPS?
Option 1: Directly through EPS bearers from the UE to the S-GW/P-GW.
Option 2: Through PDP Context(s) from the UE, with the SGSN mapping these to EPS bearers towards the S-GW/P-GW.
Option 3: Exclusively via GGSN for both GPRS and EPS connections, without bearer mapping.
Option 4: By establishing separate PDP Contexts for GPRS and EPS, each handled independently by the UE.
Explanation: This is correct because when a UE uses GERAN/UTRAN to connect to EPS, it utilizes PDP Context(s) locally, but these are mapped to EPS bearers by the SGSN for communication towards the S-GW/P-GW. This ensures compatibility and effective bearer management between the different access technologies (GPRS and EPS) in an IMS context.