5650destination-failedCarrier Service FailureCarrier Service is reporting a failure to send to a destination (mobile operator or handset).
4700invalid-service-typeCarrier Rejected as Invalid Service TypeCarrier rejected message for invalid service type. This usually means messaging (SMS or MMS) is not supported by the carrier or handset.
4775destination-rejected-due-to-user-opt-outCarrier Rejected due to user opt outUser has opted out of receiving messages from a particular sender. Remove the destination TN from subscriber list and cease communication with the destination.