I have just been educated with the following:
The SIM cards for DT4x0/4x2 contains a so called IPDI number.
When you subscribe a PP you enter CXAKI command with IPEI parameter but in fact you are always specifying the IPDI number.
All PPs except the DT4x0/4x2 has a hardcoded IPDI number that is identical to the IPEI number and then it does not matter what the number is called IPEI or IPDI because it is one and the same number anyway.
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