Question: In a Telecommunication Network, where is the 'Start Time' of an IP-CAN session recorded in the Charging Data Record (CDR), specifically for the first bearer in the session?
Option 1: At the eNodeB (eNB) when the UE initiates the session
Option 2: At the MME (Mobility Management Entity) during session setup
Option 3: At the S-GW/P-GW/IP-Edge for the first bearer in an IP-CAN session
Option 4: At the UE (User Equipment) and then synced with the network
Explanation: The correct answer reflects the accurate location where the 'Start Time' of an IP-CAN session is recorded for the first bearer. This aligns with telecom practices where the Serving and Packet Data Network Gateways (S-GW/P-GW) or IP-Edge, being key nodes in managing IP connectivity and bearers, would logically record such session initiation details for billing and management purposes. The other options are incorrect because the eNodeB primarily handles radio access, the MME is involved in control plane functions but not typically in recording bearer-level CDRs, and the UE does not independently manage or store network-level CDRs.