Question: In a SIP-I based circuit-switched core network, after a call is established, how does an Originating MSC Server (MSC-S) respond to a BYE request from the succeeding node, and what subsequent action is taken?
Option 1: Sends a 200 OK response for the BYE request and then performs normal bearer release.
Option 2: Ignores the BYE request and continues with the call setup process.
Option 3: Sends a CANCEL request to the preceding node instead of responding to the BYE.
Option 4: Delays the response until additional confirmation from the succeeding node is received.
Explanation: This is correct because, according to standard procedures for call clearing after establishment in a SIP-I based circuit-switched core network, when an Originating MSC Server receives a BYE request, it acknowledges this with a 200 OK response to confirm receipt of the termination request. Subsequently, it proceeds with the normal process of releasing the bearer resources, ensuring efficient network resource management and proper call teardown.