SMS that we send are stored in a SMSC and sent to the recipient thereafter.When the SMS is sent from the sender's phone, it is first stored in the SMSC. It is a store and forward method that is implemented in the SMSC.
If the recipient is unavailable at the moment, the SMSC should forward the message when he becomes available.If there is a cutoff period defined for the message, at that time the message will be removed from the SMSC.There is a flag to set whether the SMS Sender requires the delivery report or not.
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