OpenBSC December 2022

openbsc@lists.osmocom.org

10 participants
22 discussions

ip.access nano 3G S8 Configuration
by John Thewlis - Meath Broadband 18 Nov '25

18 Nov '25

We are trying to setup this AP as part of the 3.5G Osmocom project. We have the software stack operational and are now preparing the nano for testing. When we try to login via telnet at port 8090 we are getting a constant refusal to connect:- root@osm/openbsc/openbsc/src/ipaccess# telnet 192.168.192.30 8090 Trying 192.168.192.30... telnet: Unable to connect to remote host: Connection refused The device seems to be locked as indicated by the leds on the front panel. We have tried resetting the nano to see if this would help but to no avail. Any ideas as to how to access the device for initial configuration?. Thanks John

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Pysim error: SW match failed
by Martin Nagy 16 Aug '25

16 Aug '25

Hi all, After buying a super Sim Kit (16 in 1) from China, I tried the reader (green PCB inside a blue transparent plastic case with a blue LED) and SIM (identified as a fakesupersim) with pysim tool. However i am getting the following error: /pySim-prog.py -n 26C3 -c 49 -x 262 -y 42 -z 1234 -j 1 -t auto Insert card now (or CTRL-C to cancel) Autodetected card type fakemagicsim Generated card parameters : > Name : 26C3 > SMSP : e1ffffffffffffffffffffffff058100945555ffffffffffff000000 > ICCID : 8949262427518313026 > MCC/MNC : 262/42 > IMSI : 262422461512085 > Ki : 7b74741a1ee14337ec23f9ab92a13648 > OPC : ccd867d60797d8d45354a51b3ef568ff Programming ... Traceback (most recent call last): File "./pySim-prog.py", line 530, in <module> card.program(cp) File "/home/nadicek/pysim/pysim/pySim/cards.py", line 231, in program self._scc.update_binary('6f30', hplmn + 'ff' * (tl-3)) File "/home/nadicek/pysim/pysim/pySim/commands.py", line 53, in update_binary return self._tp.send_apdu_checksw(pdu) File "/home/nadicek/pysim/pysim/pySim/transport/__init__.py", line 87, in send_apdu_checksw raise RuntimeError("SW match failed ! Expected %s and got %s." % (sw.lower(), rv[1])) RuntimeError: SW match failed ! Expected 9000 and got 9804. I checked mailing lists and haven’t found anybody who had similar problem with pysim. Also I have tried forcing different models of SIM, but nothing is working. Obviously I can remove this check from the script file (__init__.py in /pySim/transport), however somebody had a reason to put such condition there. I would like to ask if it is safe to remove that line of code and the purpose of that line of code. Thanks a lot and best regards Martin

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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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libosmocore/BSC/MSC: MO voice calls rejected from Siemens S11E (patch included)
by Lennart Müller 01 Feb '24

01 Feb '24

Hi, I had a problem placing MO GSM calls from a Siemens S11E: The calls were dropped immediately; Osmo-MSC reports "Cannot compose Channel Type from bearer capabilities" After investigating the SETUP request from the S11E, the phone does not use octet 3a (no extension bit set in IE 3). Wireshark decodes the radio channel requirement as "Full rate support only MS/fullrate speech version 1 supported", so I added a condition to the gsm48_ie.c function of libosmocore to include at least GSM FR in the list of available speech_ver in case octet 3 has no extension. Attached to this message are the Abis-IP PCAP traces of MO calls, and the patch for gsm48_ie.c. Regards, Lennart

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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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Distributed GSM
by Keith 18 Jan '23

18 Jan '23

Hi all, I was thinking about how to deal with the so called "evil twins" in the distributed hlr, and also how to have a subscriber-create-on-demand situation at the same time as a having an mslookup client. The problem being that if we have mslookup client + fallback to create-on-demand if no HLR responds for an IMSI, we will eventually create a duplicate because the HLR that owns the IMSI is not contactable at the time of an IMSI ATTACH attempt. Anyway, just in terms of investigating the situation on my HLRs, I added features [1] - so far, an ability to do a gsup.hlr lookup and not exit on the first age:0 - so that I can see all HLRs that respond as having the imsi in local HLR, and also to ask via mDNS for HLRs that have an IMSI, but only if it's active on that HLR, that is, it has nam_cs/nam_ps So this is really asking about what people feel about expanding the D-GSM features in osmo-hlr, as I think it may be the case that rhizomatica/TIC are the only people that use it? [1] https://gitlab.tic-ac.org/rhizomatica/osmo-hlr

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Soapymultisdr
by Lanea Lucy 26 Dec '22

26 Dec '22

Hi, is it possible to use soapyMultiSdr for osmo-trx? I have a hackrf one, which isn't full duplex, so my idea is to use the hackrf for tx, and something else for Rx. With soapymultisdr it is possible to use multiple devices as a single soapysdr device.

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SGSNemu performance
by Sipos Csaba 26 Dec '22

26 Dec '22

Dear Harald, Sorry to spam the openbsc list with this, but if you (or someone) can confirm if the Sgsn-emu part of Osmo-GGSN utilizing the kernel GTP module or not, that would be lovely. FYI, I was not able to pass more than 280Mbit and the sgsn-emu process was maxing out a single core. Based on this I suspect that it does not use the kernel GTP module. I have seen some commits that indicates preparation work for this feature, but it is unclear at least to me, if this was finished or not. In the Osmo-GGSN.cfg example config I can see the config option for kernel GTP, but not in the sgsn-emu.cfg example. Regards, Csaba

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Re: OpenBSC Digest, Vol 98, Issue 9
by Sipos Csaba 26 Dec '22

26 Dec '22

Hi Pau and Harald, > So sgsnemu is passing use_kernel=false, which makes the lib skip gtp-kernel functions That is nice, I can play with that part quite nicely and take a look how the GGSN handles the switch between kernel and non-kernel GTP. Thanks for that! @Harald: In gtpnl.h there is int gtp_dev_create() and int gtp_dev_create_sgsn() So it seems there is a different dev create for the SGSN mode. And in the later one the role is set to "GTP_ROLE_SGSN" int gtp_dev_create(int dest_ns, const char *gtp_ifname, int fd0, int fd1) { return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_GGSN); } EXPORT_SYMBOL(gtp_dev_create); int gtp_dev_create_sgsn(int dest_ns, const char *gtp_ifname, int fd0, int fd1) { return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_SGSN); } EXPORT_SYMBOL(gtp_dev_create_sgsn); I just need to find the relevant part is sgsn-emu to see where these parts are invoked so I can make the modifications. Regards, Csaba <openbsc-request(a)lists.osmocom.org> ezt írta (időpont: 2022. dec. 24., Szo, 13:00): > > Send OpenBSC mailing list submissions to > openbsc(a)lists.osmocom.org > > To subscribe or unsubscribe via email, send a message with subject or > body 'help' to > openbsc-request(a)lists.osmocom.org > > You can reach the person managing the list at > openbsc-owner(a)lists.osmocom.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of OpenBSC digest..." > > Today's Topics: > > 1. Re: SGSNemu performance (Pau Espin Pedrol) > 2. Re: SGSNemu performance (Harald Welte) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 23 Dec 2022 18:38:55 +0100 > From: Pau Espin Pedrol <pespin(a)sysmocom.de> > Subject: Re: SGSNemu performance > To: Sipos Csaba <dchardware(a)gmail.com>, > "openbsc-request(a)lists.osmocom.org" <openbsc(a)lists.osmocom.org>, > laforge(a)osmocom.org > Message-ID: <782d5c68-0393-e63a-ddbd-a78ca04256e0(a)sysmocom.de> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Hi Csaba, > > > > On 12/22/22 15:00, Sipos Csaba wrote: > > Dear Harald, > > > > Sorry to spam the openbsc list with this, but if you (or someone) can > > confirm if the Sgsn-emu part of Osmo-GGSN utilizing the kernel GTP > > module or not, that would be lovely. > > sgsnemu is not using the kernel module, only osmo-ggsn has support for > it so far. > > See osmo-ggsn.git/./sgsnemu/sgsnemu.c line 1905 calling: > """ > if (tun_new((struct tun_t **)&tun, options.tun_dev_name, false, -1, -1)) > """ > > See tun_new() function used by both osmo-ggsn and sgsnemu: > """ > int tun_new(struct tun_t **tun, const char *dev_name, bool use_kernel, > int fd0, int fd1u) { > """ > > So sgsnemu is passing use_kernel=false, which makes the lib skip > gtp-kernel functions like gtp_kernel_create(). > > > > > FYI, I was not able to pass more than 280Mbit and the sgsn-emu process > > was maxing out a single core. Based on this I suspect that it does not > > use the kernel GTP module. I have seen some commits that indicates > > preparation work for this feature, but it is unclear at least to me, > > if this was finished or not. In the Osmo-GGSN.cfg example config I can > > see the config option for kernel GTP, but not in the sgsn-emu.cfg > > example. > > > > You could try passing use_kernel=true to tun_new(), and see how far you > can get. Patches welcome. > > Regards, > Pau > > > -- > - Pau Espin Pedrol <pespin(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 > * Geschaeftsfuehrer / Managing Director: Harald Welte > > ------------------------------ > > Message: 2 > Date: Fri, 23 Dec 2022 18:47:57 +0100 > From: Harald Welte <laforge(a)gnumonks.org> > Subject: Re: SGSNemu performance > To: Pau Espin Pedrol <pespin(a)sysmocom.de> > Cc: Sipos Csaba <dchardware(a)gmail.com>, > "openbsc-request(a)lists.osmocom.org" <openbsc(a)lists.osmocom.org> > Message-ID: <Y6XpzZoYYdVxYKdb@nataraja> > Content-Type: text/plain; charset=us-ascii > > Hi Csaba and Pau, > > On Fri, Dec 23, 2022 at 06:38:55PM +0100, Pau Espin Pedrol wrote: > > You could try passing use_kernel=true to tun_new(), and see how far you can > > get. Patches welcome. > > The GTP kernel module needs to be told if it operates in SGSN or GGSN mode. > > grep for GTP_ROLE_SGSN in libgtpnl. I don't know all of the related functions > off my head, but on the SGSN side you need to make sure to initialize the kernel > GTP with GTP_ROLE_SGSN instead of GTP_ROLE_GGSN. > > -- > - Harald Welte <laforge(a)gnumonks.org> https://laforge.gnumonks.org/ > ============================================================================ > "Privacy in residential applications is a desirable marketing option." > (ETSI EN 300 175-7 Ch. A6) > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > OpenBSC mailing list -- openbsc(a)lists.osmocom.org > To unsubscribe send an email to openbsc-leave(a)lists.osmocom.org > > > ------------------------------ > > End of OpenBSC Digest, Vol 98, Issue 9 > **************************************

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OpenBSC December 2022