DBF6is a SMS 365, enterprise service status code (response code), which means ‘The SMS MT has been rejected by operator. User must send MO to unblock messages’. This indicates that the end-user has restrictions set on their account, until such time they opt into a service provided by the service number.
Possible Reasons for a DBF6 response
A reason why the DBF6 response is returned, along with the actions that should be taken, are detailed below:
End-user is not registered to the service
The End-user has not opted into the service being provided
The End-user should use the appropriate MO opt-in process associated with the service provider, in order to receive the SMS MT messages.