OpenBSC June 2021

openbsc@lists.osmocom.org

12 participants
19 discussions

Re: Help with sccp library
by mosbah abdelkader 08 Jul '25

08 Jul '25

> I don't understand. This callback will be called with data you need to write > to the network. In case of MTP Level3 you will need to wrap that around the > msgb you got. I means: is the interaction with mtp3 layer implemented (is sending sccp data by mtp3 implemented by the library?)? Also, what about the reception of data from mtp3 layer. is that implemented in the sccp lib. I am asking these questions because I see the code of mtp3 in the lib but no significant call is present in the sccp part of the lib. Thank you for your help.

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dynamic traffic channels
by Neels Hofmeyr 20 May '25

20 May '25

On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote: > [translated from german] > is it certain that we switch a channel to PDCH only when > gprs mode != none? A TS can be GSM_PCHAN_TCH_F_PDCH; those are the only ones for which we send a PDCH ACT message. We send a PDCH ACT message - during init (CHANNEL OML's state changed to enabled -> send PDCH ACT), - and upon channel release ack when pchan == GSM_PCHAN_TCH_F_PDCH. So the question is, when we receive a channel release ack, could that be the PDCH release and we switch PDCH right back on by accident? No, because we only receive a chan rel ack when the *TCH/F* is being released. That is because the PDCH release is initiated "internally" from the PDCH DEACT, and thus this condition in common/rsl.c rsl_tx_rf_rel_ack() catches on, which existed before dyn PDCH: if (lchan->rel_act_kind != LCHAN_REL_ACT_RSL) { LOGP(DRSL, LOGL_NOTICE, "%s not sending REL ACK\n", gsm_lchan_name(lchan)); return 0; } In rsl_rx_rf_chan_rel() the rel_act_kind is set to LCHAN_REL_ACT_RSL, but not in the rsl_rx_dyn_pdch(). This is analogous to the ip.access way -- the ip.access nanobts replies to a PDCH DEACT with a PDCH DEACT ACK and doesn't send a separate channel release ack. Maybe we could set rel_act_kind to some new LCHAN_REL_ACT_IPAC_DYN_PDCH for clarity? (But we shouldn't actually send a release ack, to stay compatible.) Even though it works as-is, we should indeed add another flag check: - We do check the flags that no ACT/DEACT is already pending; - And we do send a PDCH DEACT only if ts->flags & TS_F_PDCH_ACTIVE; - But we would send a PDCH ACT despite ts->flags & TS_F_PDCH_ACTIVE. This should never happen, but it would make sense to ensure that. ~Neels

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Problem while running NIB on Open Cellular Base sation
by Brackley Casinga 31 Jan '24

31 Jan '24

Hi, My name is Brackley Cassinga Form DRC, we run a community network called pamoja net where we offer gsm services using osmocom open source software and OC Base station. Recently I have tried to install another base station as the same installed but I could not find any resource guiding through all the steps to take to run NIB on a base station. I'm currently running Ubuntu and I will appreciate if you could guide me on the installation of BSC,hlr,MSC , in order to run a basic gsm network. Thank you. Regards -- *Ir Brackley heshima Casinga **Pacifique* *CEO and Founder of kwanzatechnologie* KwanzaTechnologies ,GlobalElectronics +243977265291 | +243977265291 | Pcassinga(a)gmail.com/ brackley(a)ensemblepourladifference.org www.kwantechnologies.jimdosite.com <http://www.kwantechnologies.com/> | Skype: Brackley cassinga <https://webapp.wisestamp.com/#> Av Semliki N 43

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osmoSTP association establishment
by Madarassy László 26 Jun '21

26 Jun '21

Hi Devs, I have successfully compiled and integrated osmoSTP with our product. I have a question regarding to assotiaction establishment: Currently we'll initiate the associtation establishment from our product and STP will reply to our INIT message. Is it possible to start the establishment from STP side? I haven't found any cli command/configuration for this. Thanks, Laszlo

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Help on reading values of ISIM
by 程子帅 23 Jun '21

23 Jun '21

Dear Osmocom community, I am using pysim to read values of ISIM. However, it just returns "None, None". And the aids of my SIM card is ['a0000000871002ff86ffff89ffffffff']. It seems does not have ISIM application on my SIM card. How should I read values of ISIM? Best regards, Zishuai CHENG

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Announcement of "OsmoDevCall" on June 11, 2021
by Harald Welte 08 Jun '21

08 Jun '21

Dear Osmocom community, It's my pleasure to announce the next OsmoDevCall at June 11, 2021 at 20:00 CEST at https://meeting4.franken.de/b/har-xbc-bsx-wvs This meeting will have the following schedule: 20:00 meet + greet 20:15 presentation by keith: "Screen Sharing peek at TIC A.C. infrastructure in Oaxaca" 21:00 USSE: unstructured supplementary social event [*] 22:00 close of call TIC A.C. is an operator of Osmocom based community cellular networks in indigenous communities of the Mexican state of Oaxaca. Keith works with Rhizomatica and TIC A.C. and will give us some live insight into how they operate Attendance is free of charge and open to anyone with an interest in Osmocom. More information about OsmoDevCall, including the schedule for further upcoming events can be found at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCall Looking forward to meeting you on Friday. Best regards, Harald [*] this is how we started to call the "unstructured" part of osmocom developer conferences in the past, basically where anyone can talk about anything, no formal schedule or structure. -- - Harald Welte <laforge(a)osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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PySim-shell: File not found errors
by bryan coxwell 07 Jun '21

07 Jun '21

Hi all, I'm using pySim-Shell with a SysmoISIM-SJA2 as well as a SysmoUSIM-SJS1 and on both cards I get quite a few "File not found" errors trying to access different EFs. I'll use EF.NCP-IP as an example to illustrate the issue I'm having below. My initial steps when I plug in the card are as follows: 1) ./pySim-shell -p0 2) verify_adm <adm1 key> 3) select ADF.USIM Now when I run "dir" in ADF.USIM it lists a number of EFs I'm interested in, including EF.NCP-IP. Since this requires service number 80 to be available in EF.UST, I run "select EF.UST" followed by "ust_service_activate 80". This runs without issue. When I run select ADF.USIM now followed by select EF.NCP-IP, the card returns a "File not found" error. So my questions are: Is this file not supported on the SJA2 and SJS1? Is there a way for me to add those files to ADF.USIM? Is there a list of the known supported EFs of the SJA2 and SJS1? I looked and couldn't find anything. Thank you in advance!

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No ISIM application on SysmoISIM-SJA2?
by bryan coxwell 07 Jun '21

07 Jun '21

Hi all, I feel like I may be missing something about how SIM cards work here, but I’m unable to figure out how to load the ISIM application on my SysmoISIM-SJA2s, so I’m reaching out here for some help. I started with pySim-shell and listed the directories under the MF directory and it shows only ADF.USIM, so I decided to use shadysim_isim.py to list out the applications on the card and was shown this: AID: a0000000620001, State: 01, Privs: 00 AID: 4a6176656c696e2e6a637265, State: 01, Privs: 00 AID: a0000000620101, State: 01, Privs: 00 AID: a0000000620102, State: 01, Privs: 00 AID: a0000000620201, State: 01, Privs: 00 AID: a000000062020801, State: 01, Privs: 00 AID: a00000006202080101, State: 01, Privs: 00 AID: a0000000620002, State: 01, Privs: 00 AID: a0000000620003, State: 01, Privs: 00 AID: a000000062010101, State: 01, Privs: 00 AID: a00000015100, State: 01, Privs: 00 AID: a0000000090005ffffffff8911000000, State: 01, Privs: 00 AID: a0000000090005ffffffff8912000000, State: 01, Privs: 00 AID: a0000000090005ffffffff8913000000, State: 01, Privs: 00 AID: a0000000090005ffffffff8911010000, State: 01, Privs: 00 AID: a0000000871005ffffffff8913100000, State: 01, Privs: 00 AID: a0000000871005ffffffff8913200000, State: 01, Privs: 00 AID: a0000000090003ffffffff8910710001, State: 01, Privs: 00 AID: a0000000090003ffffffff8910710002, State: 01, Privs: 00 AID: a0000000090005ffffffff8915000000, State: 01, Privs: 00 AID: a00000015141434c, State: 01, Privs: 00 Instance AID: a00000015141434c00 The SysmoUSIM/ISIM manual pointed me to Annex E of 3GPP 101.220 which says the prefix of the ISIM application is A00..00871004. So my questions are: Am I missing something and the app is installed? If not, is there a way to load and install the ISIM application? Thanks in advance everyone.

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Issue with LimeSDR Mini
by Akib Sayyed 06 Jun '21

06 Jun '21

Dear List I am trying to use latest Osmo-core suite (osmo:stp,hlr,msc,bsc,bts,mgw) with limesdr mini but facing issue as soon power rampup starts. is there any stable release which I can use with limesdr mini -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

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OpenBSC June 2021