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Bug #6181
openUnexpected INS code with simtrace2-sniff: 0x7f
Start date:
09/15/2023
Due date:
% Done:
0%
Spec Reference:
Description
Hello,
I used `simtrace2-sniff` to sniff the messages between my sysmocom SIM cards and a Google Pixel 5, during 5G SA registration. I captured the traffic with tcpdump over port 4729 (pcap file attached).
I am using Open5GS and srsRAN (5G) for the core and RAN respectively. The phone connects to the core successfully and has internet access.
When I replay the captured messages with pySim-trace I get the following error: "ValueError: Unknown CLA=A4 INS=7F". Wireshark also shows the same INS code, as Unknown (0x7f).
I looked at ETSI TS 102 221 V17.1.0 (2022-02), Table 10.5, and couldn't find any reference of APDU with INS code 0x7f.
Do you have any insights on why this APDU is showing up?
Thanks,
Marinos
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