What does DLR Error 7 - Handset Busy mean?

Error 7 - Handset Busy refers to hand set not available at the time of message submission. As it is a temporary issue message should be retried at a later attempt if received with status 'Failed'. If received with an 'Accepted' status, message has is in the retry scheme and will be retried until its expiration (24-48 hours)

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