Question: In a scenario where a User Equipment (UE) initiates IMS registration, as per 3GPP specifications, what is the primary goal of the procedure outlined for preventing IMS Signalling over GERAN?
Option 1: To ensure seamless handover from E-UTRA to GERAN for ongoing IMS sessions.
Option 2: To prioritize IMS signalling over other packet-switched services on GERAN.
Option 3: To prevent the initiation of IMS signalling by the UE when connected to a GERAN network.
Option 4: To enhance the security of IMS signalling transmissions over GERAN.
Explanation: The correct answer, Option 3, aligns with the purpose stated in the context, which is to prevent IMS signalling if it is initiated by the UE when connected to a GERAN (GSM/EDGE Radio Access Network) network. This procedure is crucial for managing and controlling IMS (IP Multimedia Subsystem) activities based on the type of radio access network the UE is currently using, ensuring compliance with specific network capabilities and constraints.