The possible status callbacks when sending an MT SMS or MMS or RBM message: - message-sending indicates that Bandwidth is sending the message to the upstream provider. - message-sent indicates that the message has left the Bandwidth network and is in transit to the provider. - message-delivered indicates that the message was successfully delivered to handset. - message-failed indicates that the message could not be sent to the intended recipient. - message-read indicates that the RBM message was read by the recipient.
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