What occurs in step 8 of the SS7-VoIP Gateway Call Progress?

In step 8 of the SS7-VoIP Gateway Call Progress, the correct event is that the destination SSP rings the destination subscriber telephone set. This step is significant because it indicates that the call has successfully reached the destination signaling point, and the call setup process is actively notifying the recipient that they are being called.

During this phase, the signaling system (SS7) communicates the call setup information, signaling that ringing has commenced at the destination location. This involves sending ringing signals back through the network to alert the caller that the call is being processed and that the destination device is indeed being prompted to respond. This mechanization is crucial for establishing a connection between the two parties involved in the call.

The other choices represent different stages or outcomes that do not occur specifically in this step. For instance, hanging up or disconnection pertains to terminating the call, which would happen after the call has been established or if one party decides to end the call. When the call is established, it means that the communication is successfully initiated and the two parties can interact, which is a result that would occur after the ringing step.