Signaling link failures are handled within the MTP layers. Applications are not notified of signaling link failures unless the failure leaves a concerned destination unreachable (in which case it receives a pause event for the concerned destination) or the application/user part registered for link status events.
Signaling link recovery is automatic and transparent to MTP user parts and applications unless it results in a previously unreachable destination becoming reachable or the application/user part has explicitly registered for link status events.
In SIGTRAN configurations, loss of all associations triggers an HMI_EVN_NETWORK_DOWN event. A redundancy manager program, such as the RMG demonstration program, can use this event to switch over to the backup associations, allowing traffic to quickly resume.