hi dear I install openbsc, osmosgsn, ggsn, osmo-trx, osmo-bts-trx, osmo-pcu and dependency from master branch step by step from this link. <https://osmocom.org/projects/cellular-infrastructure/wiki/OpenBSC_GPRS> but when run osmo-nitb, osmo-trx and osmo-bts-trx, mobile connect to network but no access to network. (I used USRP N210/B210, ubuntu 15.10/16.10 64x) osmo-nitb log: 20170130041914525 DRLL <0000> chan_alloc.c:352 (bts=0,trx=0,ts=0,pchan=CCCH+SDCCH4) Allocating lchan=0 as SDCCH 20170130041914525 DRSL <0004> abis_rsl.c:1819 (bts=0,trx=0,ts=0,ss=0) Activating ARFCN(0) SS(0) lctype SDCCH r=LOCATION_UPDATE ra=0x05 ta=0 20170130041914525 DRSL <0004> abis_rsl.c:580 (bts=0,trx=0,ts=0,pchan=CCCH+SDCCH4) Tx RSL Channel Activate with act_type=INITIAL 20170130041914525 DRSL <0004> abis_rsl.c:1189 (bts=0,trx=0,ts=0,ss=0) state NONE -> ACTIVATION REQUESTED 20170130041914525 DRSL <0004> abis_rsl.c:1546 (bts=0,trx=0,ts=0,ss=0) CHANNEL ACTIVATE ACK 20170130041914525 DRSL <0004> abis_rsl.c:1189 (bts=0,trx=0,ts=0,ss=0) state ACTIVATION REQUESTED -> ACTIVE 20170130041924529 DRSL <0004> abis_rsl.c:852 (bts=0,trx=0,ts=0,ss=0) RF Channel Release due to error: 1 20170130041924529 DRSL <0004> abis_rsl.c:762 (bts=0,trx=0,ts=0,ss=0) DEACTivate SACCH CMD 20170130041924529 DRSL <0004> abis_rsl.c:1189 (bts=0,trx=0,ts=0,ss=0) state ACTIVE -> RELEASE DUE ERROR 20170130041924530 DRSL <0004> abis_rsl.c:925 (bts=0,trx=0,ts=0,ss=0) RF CHANNEL RELEASE ACK 20170130041926530 DRSL <0004> abis_rsl.c:811 (bts=0,trx=0,ts=0,ss=0) is back in operation. 20170130041926531 DRSL <0004> abis_rsl.c:1189 (bts=0,trx=0,ts=0,ss=0) state RELEASE DUE ERROR -> NONE NITB config: ! ! OpenBSC (0.15.0.646-f1886-dirty) configuration saved from vty !! password foo ! log stderr logging filter all 1 logging color 1 logging print category 1 logging print extended-timestamp 1 logging level all everything logging level rll debug logging level cc debug logging level mm info logging level rr info logging level rsl debug logging level nm debug logging level mncc debug logging level pag debug logging level meas notice logging level sccp notice logging level msc notice logging level mgcp notice logging level ho notice logging level db notice logging level ref notice logging level gprs notice logging level ns info logging level bssgp notice logging level llc notice logging level sndcp notice logging level nat notice logging level ctrl notice logging level smpp notice logging level filter notice logging level ranap debug logging level sua debug logging level lglobal notice logging level llapd notice logging level linp notice logging level lmux notice logging level lmi notice logging level lmib notice logging level lsms notice logging level lctrl notice logging level lgtp notice logging level lstats notice logging level lgsup notice logging level loap notice ! stats interval 5 ! line vty no login ! e1_input e1_line 0 driver ipa e1_line 0 port 0 no e1_line 0 keepalive ipa bind 127.0.0.1 network network country code 432 mobile network code 70 short name dynch long name dynch auth policy accept-all authorized-regexp .* location updating reject cause 13 encryption a5 0 neci 1 paging any use tch 0 rrlp mode none mm info 1 handover 0 handover window rxlev averaging 10 handover window rxqual averaging 1 handover window rxlev neighbor averaging 10 handover power budget interval 6 handover power budget hysteresis 3 handover maximum distance 9999 timer t3101 10 timer t3103 0 timer t3105 0 timer t3107 0 timer t3109 4 timer t3111 0 timer t3113 60 timer t3115 0 timer t3117 0 timer t3119 0 timer t3122 10 timer t3141 0 subscriber-keep-in-ram 0 bts 0 type sysmobts band GSM900 cell_identity 0 location_area_code 1 base_station_id_code 63 ms max power 15 cell reselection hysteresis 4 rxlev access min 0 periodic location update 30 radio-link-timeout 32 channel allocator ascending rach tx integer 9 rach max transmission 7 channel-descrption attach 1 channel-descrption bs-pa-mfrms 5 channel-descrption bs-ag-blks-res 1 early-classmark-sending forbidden ip.access unit_id 1800 0 oml ip.access stream_id 255 line 0 neighbor-list mode automatic codec-support fr gprs mode gprs gprs 11bit_rach_support_for_egprs 0 gprs routing area 0 gprs network-control-order nc1 gprs cell bvci 1800 gprs cell timer blocking-timer 3 gprs cell timer blocking-retries 3 gprs cell timer unblocking-retries 3 gprs cell timer reset-timer 3 gprs cell timer reset-retries 3 gprs cell timer suspend-timer 10 gprs cell timer suspend-retries 3 gprs cell timer resume-timer 10 gprs cell timer resume-retries 3 gprs cell timer capability-update-timer 10 gprs cell timer capability-update-retries 3 gprs nsei 1800 gprs ns timer tns-block 3 gprs ns timer tns-block-retries 3 gprs ns timer tns-reset 3 gprs ns timer tns-reset-retries 3 gprs ns timer tns-test 30 gprs ns timer tns-alive 3 gprs ns timer tns-alive-retries 10 gprs nsvc 0 nsvci 1800 gprs nsvc 0 local udp port 23000 gprs nsvc 0 remote udp port 23000 gprs nsvc 0 remote ip 127.0.0.1 gprs nsvc 1 nsvci 0 gprs nsvc 1 local udp port 0 gprs nsvc 1 remote udp port 0 gprs nsvc 1 remote ip 0.0.0.0 no force-combined-si trx 0 rf_locked 0 arfcn 0 nominal power 23 max_power_red 0 rsl e1 tei 0 timeslot 0 phys_chan_config CCCH+SDCCH4 hopping enabled 0 timeslot 1 phys_chan_config TCH/F hopping enabled 0 timeslot 2 phys_chan_config TCH/F hopping enabled 0 timeslot 3 phys_chan_config TCH/F hopping enabled 0 timeslot 4 phys_chan_config PDCH hopping enabled 0 timeslot 5 phys_chan_config PDCH hopping enabled 0 timeslot 6 phys_chan_config PDCH hopping enabled 0 timeslot 7 phys_chan_config PDCH hopping enabled 0 mncc-int default-codec tch-f fr default-codec tch-h hr nitb subscriber-create-on-demand assign-tmsi OSMO-BTS-TRX Config file ! ! OsmoBTS (0.4.0.372-f65b) configuration saved from vty !! ! log stderr logging filter all 1 logging color 0 logging print category 1 logging print extended-timestamp 1 logging level all everything logging level rsl debug logging level oml debug logging level rll notice logging level rr notice logging level meas notice logging level pag info logging level l1c debug logging level l1p info logging level dsp debug logging level pcu notice logging level ho notice logging level trx notice logging level loop notice logging level abis notice logging level rtp notice logging level sum notice logging level lglobal notice logging level llapd debug logging level linp notice logging level lmux notice logging level lmi notice logging level lmib notice logging level lsms notice logging level lctrl notice logging level lgtp notice logging level lstats notice logging level lgsup notice logging level loap notice ! line vty no login ! e1_input e1_line 0 driver ipa e1_line 0 port 0 no e1_line 0 keepalive phy 0 osmotrx ip 127.0.0.1 osmotrx fn-advance 20 osmotrx rts-advance 5 osmotrx tx-attenuation oml instance 0 bts 0 band GSM900 ipa unit-id 1800 0 oml remote-ip 127.0.0.1 rtp jitter-buffer 100 paging queue-size 200 paging lifetime 0 uplink-power-target -75 min-qual-rach 50 min-qual-norm -5 no ms-power-loop timing-advance-loop trx 0 power-ramp max-initial 23000 mdBm power-ramp step-size 2000 mdB power-ramp step-interval 1 ms-power-control dsp phy 0 instance 0 Regards