Why use reverse nibbled ​in decimal-octets in SMS PDUs?

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.

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