DLR status Download full documentation

This is the full list of possible DLR statuses.

Full DLR status list

DLR status code	Description
0	Message is sent, no status yet (default)
1	Message is delivered
2	Message is not sent
3	Message delivery failed
4	Message is sent
5	Message expired
6	Message has an invalid destination address
7	SMSC error, message could not be processed
8	Message not allowed
11	Message status unknown, usually after 24 hours without update SMSC
12	Message status unknown, SMSC received unknown status code
13	Message status unknown, no status update received from SMSC after 72 hours