Wireshark filters for GSM

System Information

    gsmtap.chan_type==1

Immediate Assignment

    gsm_a.dtap.msg_rr_type==0x3f

look for circuit switched IAs

and eventually build a custom filter for it,

    Channel Description > Apply as filter > Selected

    ts=X

SDCCH/8

force sub-slot as filter

gsmtap.sub_slot==Y

filter-out fragments, func=UI, func=RR

gsmtap.chan_type==8

look for Cipher Mode Command

gsm_a.dtap.msg_rr_type == 0x35

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