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Bruckner Jan (ETAS-SEC/ECT-Mu) Jan.Bruckner at escrypt.comHi Domi, I have attached another trace containing the following: - Location Update + Authentication of the MS that will send the SMS (packets 1-45) - Sending and receiving an SMS (text: “a5/1”) with encryption set to A5/1 (packets 46-140) - works - Sending an SMS (text: “a5/3”) with encryption set to A5/3 (packets 141-730) - the MS tries to send several times until it gives up. No Ciphering Mode Complete is received. - Switching back to A5/1 and resending the SMS with text "a5/3" (packets 731-827) - works I hope that helps. Thanks, Jan -------------- next part -------------- A non-text attachment was scrubbed... Name: a5_1_3_with_LU_Auth.pcapng Type: application/octet-stream Size: 96324 bytes Desc: a5_1_3_with_LU_Auth.pcapng URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20180306/0ff3a594/attachment.obj>