0

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?

김어진
  • 3
  • 1

1 Answers1

0

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.

Marvin
  • 598
  • 5
  • 14