Question: In a telecom network, when a call is eligible for Optimal Routeing (SOR), what action does the Visitor Location Register's (VLR) associated Gateway Mobile Switching Center (GMSC) function perform?
Option 1: Initiates call setup with the originating MSC to reduce latency
Option 2: Routes the call directly to the Public Switched Telephone Network (PSTN)
Option 3: Updates the caller's location in the Home Location Register (HLR)
Option 4: Receives the routed call from VMSCA if the gsmSCF indicates eligibility for optimal routeing
Explanation: This is correct because, according to the specified behavior of VMSCA in relation to Optimal Routeing (SOR), when a call is deemed eligible by the gsmSCF, VMSCA routes the call to its associated GMSC function. This action enables efficient handling and routing of the call, leveraging the benefits of optimal routeing for potentially reduced costs or improved connectivity.