Payload sent by SignalWire to your SMS Status Callback URL when the status of an SMS/MMS message changes.
Configure this callback using the StatusCallback parameter when
sending an outgoing message.
There are 8 possible message statuses:
SignalWire only marks a message as delivered when it receives a Delivery Receipt (DLR)
from the receiving carrier confirming entry into the end carrier’s network. sent means the message
left SignalWire and reached the downstream peer. Some carriers send delayed DLRs; others send none
at all. MMS messages never receive DLRs, so they will only ever reach sent status.
The current status of the message at the time of the callback.
One of: queued, sending, sent, delivered, undelivered, failed, receiving, received.
The number of segments that make up the entire message. If the body exceeds 160 GSM-7 characters or 70 UCS-2 characters, it is automatically split into smaller segments that are annotated for reconstruction on the recipient handset.