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<pdu> service centre address followed by GSM 03.40 Protocol
Data Unit in hexadecimal format
<fo> first octet of SMS-STATUS-REPORT in integer format
<mr> message reference
<addr> receiver address
<type> type of receiver address, 129 for normal and 145 for
international access (number contains ‘+’ character)
<scts> service centre time stamp
<dt> discharge time
<st> status