Delivery report removed with intermediate DLR_SMSC_SUCCESS (type=8)
"dlr-mask" parameter is configured as 31 when sending the message to Kannel via Smsbox.
When the SMSC (in my case HTTP) receives DLR with dlr-mask=8, the delivery report is incorrectly removed from the database. There is no final DLR yet.
When final DLR is received (dlr-mask=1 for example), the DLR is missing in the database and final DLR is discarded.