Question: In a scenario where a UE is attached to an MSC Server and the use of Gm or I1 reference point is not possible due to VPLMN limitations, which of the following applies regarding Service Consistency for non-ICS (IP Multimedia Subsystem Centralized Services) UE?
Option 1: Service Consistency procedures specified for ICS-enhanced MSC Servers apply.
Option 2: Alternative routing via S-CSCF (Serving Call Session Control Function) is always utilized.
Option 3: Service Consistency for non-ICS UE applies only if the MSC Server is enhanced with specific ICS Procedures.
Option 4: The UE automatically falls back to CSFB (Circuit Switched Fallback) for service consistency.
Explanation: Even when attached to an MSC Server where Gm or I1 reference points are unusable due to VPLMN limitations, if the MSC Server is enhanced with ICS Procedures, Service Consistency procedures related to such enhancements still apply for non-ICS UE. This ensures seamless user experience across different network capabilities.