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Harald Welte laforge at osmocom.orgDear Sergei, I'm not an expert in GEA and it's been a long time since I last looked at it. However, On Fri, Sep 18, 2020 at 12:53:43PM +0300, Сергей Егоров wrote: > Can the value of IOV_UI (Osmocom BS: 0, real BS: 0x10000000) affect the deciphering, and if yes then how?? well, as you know the IV (initialization vector) is an input parameter into the encryption/decryption algorithm. It must match, otherwise you will get completely different results. You could try to modify the Osmocom stack (here: OsmoSGSN) to also use the same IV that you see in your commercial/production netwokr, and see if that gets you any further in understanding any differences? -- - Harald Welte <laforge at osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)