Question: In a roaming scenario, how does an Interconnection Border Control Function (IBCF) handle Circuit Switched (CS) media present in a SIP/SDP message within an IP Multimedia Subsystem (IMS)?
Option 1: The IBCF allocates resources for CS media and prioritizes it over other media types.
Option 2: The IBCF does not allocate resources for CS media but considers it for other media control functions.
Option 3: The IBCF rejects the SIP/SDP message if CS media is present to prevent resource conflicts.
Option 4: The IBCF automatically converts CS media to Packet Switched (PS) media for efficient handling.
Explanation: In roaming scenarios, to maintain seamless communication and avoid unnecessary resource allocation for media that might not be utilized through the IMS infrastructure directly (since CS media implies a different network path), the IBCF refrains from allocating resources specifically for CS media. However, it still considers this media type in its overall media control strategies to ensure compatibility and proper call setup/management, reflecting the nuanced handling required in complex telecom networks.