Recovering transactions after an MSC link failure

When an MSC link failure occurs, IMS always recovers all messages, including IMS transactions and responses that are enqueued, about to be enqueued, or being sent across an MSC link. This recoverability is guaranteed, regardless of whether the message is en route to a local, intermediate, or remote MSC system.

The recoverability is not affected by the transaction mode (recoverable or irrecoverable) or the discardable or nondiscardable characteristics of the LU 6.2 protocol used to send the transaction to the local IMS.

Link failures can delay messages from other IMS systems and cause the synchronous LU 6.2 conversation to wait longer than expected for the response.