SMPP Error Codes

All errors on the SMPP connection received in submit_sm_resp are described in the SMPP Protocol Specification v3.4 Issue 1.2 chapter 5.1.3 command_status

Message state information

A message will always be in one of the following states:

Message State	Value	Description
ENROUTE	1	Message is in the process of being sent to the destination
DELIVERED	2	Message has been delivered to destination
EXPIRED	3	Message validity period has expired
DELETED	4	Message has been deleted
UNDELIVERABLE	5	Message is undeliverable
UNKNOWN	7	Message is in invalid state