I am studying for SMS PDU.
However, I do not know why the SMS PDU transmits the phone number and the like by reverse nibbled. (012345 to 103254)
Why does it work like this?
Why use reverse nibbled in decimal-octets in SMS PDUs?
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Noone knows excactly :) But in telco within SS7 protocol, almost all numbers are reversed (vlr,hlr,imsi etc.) In older days on slow networking, every bit matters, thats why SS7 is so optimized. I believe it has to do with a speed when number has odd length. In newer protocols (like Volte) there is no such thing anymore.