Question: Upon receiving an LCLS-Connect-Control message with 'Release LCLS' for a single call leg associated with an LCLS call, how does the Base Station Subsystem (BSS) respond?
Option 1: The BSS breaks local switching and sends an LCLS-Notification to both MSC servers involved.
Option 2: The BSS maintains local switching, sending only an LCLS-Connect-Control Acknowledge to the MSC server with LCLS-BSS-Status indicating LCLS is still established.
Option 3: The BSS waits for a confirmation from the far-end MSC server before responding with an LCLS-Connect-Control Acknowledge.
Option 4: The BSS releases all resources associated with the LCLS call and notifies the UE (User Equipment) of the release.
Explanation: When the 'Release LCLS' request is for only one call leg of an LCLS call, the BSS does not terminate local switching to maintain the ongoing connection on the other leg. It acknowledges this by sending a message to the MSC (Mobile Switching Center) server indicating that LCLS remains active, without disrupting the existing local switch setup. This approach ensures continuity for the unaffected call leg.