Delivery states

Queued to delivered lifecycle and polling

queued accepted sent deliveredorfailed

queued

Persisted and waiting for an outbound worker.

accepted

Kannel accepted the submission. Not final delivery.

sent

Provider reports the message left the SMSC.

delivered

Terminal success from a delivery receipt.

failed

Terminal failure. May include errorCode / errorMessage.

Poll GET /messages/{messageId} for normalized status and timestamps, or subscribe to webhooks.