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Sylvain Munaut 246tnt at gmail.comHi Dieter, Thanks for the trace, I'll have a look now. In the mean time I made some progress: - I have to remove the NM_ATT_IPACC_RLC_CFG_3 tag and config from nanobts_attr_cell. If I don't the GPRS CELL NACKs the attributes and never activate. The message sent back by the bts is "new value for attribute RLC Configuration 3 not supported" - In gprs_bssgp.c the function bssgp_rx_ul_ud calls : bts = gsm48_bts_by_ra_id( TLVP_VAL(&tp, BSSGP_IE_CELL_ID), TLVP_LEN(&tp, BSSGP_IE_CELL_ID)); But gsm48_bts_by_ra_id defined in gsm_04_08_gprs.c takes 3 arguments the gsm_network as first one then the buffer and lenght. Since the function was implicitely defined in gprs_bssgp.c, it compiled but of course segfaulted as soon as it got there ... I don't even understand how it worked for you. - Now, I get this : <0004> gsm_04_08_gprs.c:434 GMM RA UPDATE REQUEST type="RA updating" REJECT <0004> gsm_04_08_gprs.c:408 <- ROUTING AREA UPDATE REJECT But as soon as the REJECT is sent to the BTS, it reboots ... no error no message nothing ... Sylvain