- OpenBSC - lists.osmocom.org

LAI_AND_LAC, curious
by Neels Hofmeyr 20 Dec '18

20 Dec '18

Re commit 6cb833608fa39943c1ce9fe046992922e09f4266 rename CELL_IDENT_LAI_AND_LAC to CELL_IDENT_LAI The name "LAI AND LAC" makes no sense because a LAC is part of a LAI. Keep the old name available for API backwards compatibility. Change-Id: I2749cf75b7b45de0cd43cf4c696a6b6984f5a065 Related: OS#3124 I remember giving similar code review during the gsm0808_cell_ident patches, and I think the conclusion was that even the specs speak of LAI_AND_LAC. Well, anyway, I'm glad that sanity made it to the CELL_IDENT API finally :) ~N

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Note about IuUP
by Mykola Shchetinin 20 Dec '18

20 Dec '18

Hello, It is about how I got a voice working between UE connected to Osmocom 3G (external call handling - Kamailio PBX) and VoIP softphone connected to the PBX. The part about is IuUP only. (Transcoding comes later) I have a traces of a call where a commercial NITB was used and I compared them to traces which I got from a call where Osmocom system was used. (Osmocom Core consisted of libosmocore of branch laforge/iu_up, osmo-mgw of branch neels/iuup and other stuff from Nightly Builds) My femtocell (nano3g ip.access) uses AMR 12.2k as a codec. The difference in IuUP <-> AMR conversion between two. When converting from IuUP to AMR: - Osmo-mgw only strips IuUP header from RTP payload; - Commercial NITB strips IuUP header and prepends AMR header to RTP payload; When converting from AMR to IuUP: - Osmo-mgw only prepends IuUP header to RTP payload; - Commercial NITB strips AMR header and prepends IuUP header to RTP payload; So that means basically that my femtocell sends AMR payload as IuUP payload without AMR header. And expects AMR payload inside IuUP message without AMR header. IuUP header is 4 bytes. AMR header for octet-aligned mode is 2 bytes. To test this I've modified the code of iuup_cn_node.c so that it does: - when converting from IuUP data (rx_data): after stripping IuUP header it prepends 0xf03c as a header (it is for AMR 12.2k). - when converting to IuUP data (osmo_iuup_cn_tx_payload): before prepending IuUP header it strips AMR header. The call performed had voice on both sides. It was performed between a regular phone connected to a femtocell and a VoIP softphone connected to Kamailio PBX. Kind regards, Mykola

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3G Working Setup
by Ron 19 Dec '18

19 Dec '18

Hi Community, Does anyone successfully run a 3G network using OSMOCOM elements? Currently we are trying to run the following OSMO elements using this URL "https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…. Instead of using a 3G femto cell as HnodeB, does anyone tried to use UMTRX, B210, and LimeSDR? Is there other software that will act as HnodeB between the SDR and OSMOHNBGW? TIA. Best Regard, Ron Menez ron.menez(a)entropysolution.com<mailto:ron.menez@entropysolution.com>

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nano3g ip.access femtocells and transcoding
by Mykola Shchetinin 18 Dec '18

18 Dec '18

Dear Osmocom community, Did somebody try to use nano3g ip.access femtocells and Osmocom system with external call handling? What I am trying to do is to make calls work between VoIP phones connected to PBX and UEs connected to Osmocom system. I've tried two PBXs: Kamailio with rtpengine and Asterisk. Signalling worked good between VoIP phone and UE with both PBXs; calls between two UEs registered on Osmocom system worked good also... But I fail to do transcoding (calls between VoIP phone and UE). The problem is that it is unknown which codec is used by nano3g ip.access femtocell. So, the question is: Do you know what codecs were used for speech in your setup with nano3g ip.access femtocells? Or do you know how to find out that information? (It was stated by ip.access that they use AMR but I failed to match AMR specs with RTP payload that was sent by femtocell...). I would be very grateful for any ideas. Kind regards, Mykola

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switched to gerrit +3, some ideas
by Neels Hofmeyr 17 Dec '18

17 Dec '18

There are obvious problems with the current +3 enforcing scheme on gerrit. a) if a patch has +2, the summary shows a tick mark, you don't see that another +1 is needed. b) if a patch has three +1s, the summary shows +1, you don't see that it can be merged. c) voting +1 for an own patch has an effect on the mergability. Ideas to improve: a) +2 hides missing +1 On IRC, we agreed that it is a good idea to require two reviews (by two people) -- three is too much. Currently that would be one +2 vote plus one +1 vote. (alternatively 3x +1, too). Idea: if we remove the "+2" ability, we avoid the problem that a +2 hides the missing +1. Everyone has only +1 votes, and we add up using that plugin. To require only two reviews, we merge once a sum of +2 is reached. b) 3x +1 == "+1" There's no solution short of fixing what gerrit shows in the summary. Everyone will still click on the patch and then see that it already has three votes. c) +1 to self The solution is that you don't vote for your own patches, unless it is really super trivial and not worth wasting others' review time on. Let's see for a few days how we fare with these quirks. ~N

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Re: Build failed in Jenkins: master-osmo-sgsn » --disable-iu,1,a3=default,a4=default,osmocom-master-debian9 #7511
by Neels Hofmeyr 16 Dec '18

16 Dec '18

Created issue OS#3736 for this. Let's collect failing build details there. ~N

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OT: owning a sysmoBTS we could use for 35c3?
by Neels Hofmeyr 15 Dec '18

15 Dec '18

Hi, if anyone owns a sysmoBTS and either comes to 35c3 or can easily pass it on: can we use your sysmoBTS for the GSM installation, please? They will get insured by the event, we just need the serial number(s). I might also ask you personally later this week / at sysmocom office. Thanks! ~N

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build slave segfaults
by Neels Hofmeyr 12 Dec '18

12 Dec '18

I see sporadic segfaults during jenkins builds every now and then... Let's keep an eye on it. This one built on build2-deb9build-ansible ~N On Wed, Dec 12, 2018 at 12:52:59AM +0000, jenkins(a)lists.osmocom.org wrote: > See <https://jenkins.osmocom.org/jenkins/job/master-osmo-msc/IU=--enable-iu,WITH…> > ... > CC auth_milenage.lo > /bin/bash: line 2: 6091 Segmentation fault (core dumped) /bin/bash ../../libtool --silent --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I../.. -I../../include -I../../include -I/usr/include/p11-kit-1 -DBUILDING_LIBOSMOCORE -Wall -Wall -g -O2 -DBUILDING_LIBOSMOCORE -Wall -MT auth_milenage.lo -MD -MP -MF $depbase.Tpo -c -o auth_milenage.lo auth_milenage.c > make[3]: *** [auth_milenage.lo] Error 139 > Makefile:582: recipe for target 'auth_milenage.lo' failed > make[3]: *** Waiting for unfinished jobs.... > make[3]: Leaving directory '/build/deps/libosmocore/src/gsm'

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Re: Build failed in Jenkins: master-osmo-pcu » origin/nrw/litecell15,0,osmocom-master-debian9,lc15,True #1068
by Neels Hofmeyr 12 Dec '18

12 Dec '18

whoops, another one On Wed, Dec 12, 2018 at 01:22:09PM +0000, jenkins(a)lists.osmocom.org wrote: > make[1]: Entering directory '<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…'> > CXX gprs_debug.lo > CXX csn1.lo > CXX gsm_rlcmac.lo > CXX gprs_bssgp_pcu.lo > CXX gprs_rlcmac.lo > CXX gprs_rlcmac_sched.lo > CXX gprs_rlcmac_meas.lo > CXX gprs_rlcmac_ts_alloc.lo > gprs_bssgp_pcu.cpp:982:2: warning: #warning "This causes ASAN to complain. It is not critical for normal operation but should be fixed nevertheless" [-Wcpp] > #warning "This causes ASAN to complain. It is not critical for normal operation but should be fixed nevertheless" > ^~~~~~~ > CXX gprs_ms.lo > CXX gprs_ms_storage.lo > CXX gsm_timer.lo > CXX pcu_l1_if.lo > CC pcu_vty.lo > CXX pcu_vty_functions.lo > CC mslot_class.lo > CXX tbf.lo > CXX tbf_ul.lo > CXX tbf_dl.lo > /bin/bash: line 2: 9155 Segmentation fault /bin/bash ../libtool --silent --tag=CXX --mode=compile g++ -DPACKAGE_NAME=\"osmo-pcu\" -DPACKAGE_TARNAME=\"osmo-pcu\" -DPACKAGE_VERSION=\"0.5.1.38-5b52\" -DPACKAGE_STRING=\"osmo-pcu\ 0.5.1.38-5b52\" -DPACKAGE_BUGREPORT=\"osmocom-net-gprs(a)lists.osmocom.org\" -DPACKAGE_URL=\"\" -DPACKAGE=\"osmo-pcu\" -DVERSION=\"0.5.1.38-5b52\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DSTDC_HEADERS=1 -I. -I../include -Wall -I<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…> -I<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…> -fno-strict-aliasing -I<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…> -DENABLE_DIRECT_PHY -I<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…> -I./osmo-bts-litecell15 -Wall -ldl -pthread -g -O2 -MT tbf_ul.lo -MD -MP -MF $depbase.Tpo -c -o tbf_ul.lo tbf_ul.cpp > Makefile:779: recipe for target 'tbf_ul.lo' failed > make[1]: *** [tbf_ul.lo] Error 139 > make[1]: *** Waiting for unfinished jobs.... > make[1]: Leaving directory '<https://jenkins.osmocom.org/jenkins/job/master-osmo-pcu/FIRMWARE_VERSION=or…'> > Makefile:466: recipe for target 'all-recursive' failed > make: *** [all-recursive] Error 1 > Build step 'Execute shell' marked build as failure > [WARNINGS]Skipping publisher since build result is FAILURE -- - Neels Hofmeyr <nhofmeyr(a)sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte

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vty expect script
by Neels Hofmeyr 12 Dec '18

12 Dec '18

Hi Keith, I'm now using your vty expect script from https://gerrit.osmocom.org/#/c/osmo-dev/+/11811/ in our congress gsmcore setup, and I absolutely love it! I tweaked the logging, and next to it I also put vty_sticky, which re-opens the vty when the program gets restarted. Attached my current versions. Such a simple and nice way to customize logging, easily attach and detach, quickly change some log levels... much simpler than navigating journalctl. Thanks for that! ~N

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