OpenBSC October 2022

openbsc@lists.osmocom.org

13 participants
14 discussions

by mosbah abdelkader

> 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.

4 weeks

dynamic traffic channels

by Neels Hofmeyr

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

1 month

cmd2 update causing pySim-shell to fail

by bryan coxwell

Hi all, Just wanted to share an issue and a quick workaround I found for it in case anyone else has the same problem. I believe a cmd2 update is causing pySim-shell to fail. After installing it on a fresh install of Ubuntu Server 20.04 and getting the following error when I run "python3 pySim-shell -p0": >Using PC/SC reader interface >Autodetected card type: sysmoUSIM-SJS1 >AIDs on card: > USIM: a0000000871002ffffffff8907090000 >Traceback (most recent call last): > File "pySim-shell.py", line 512, in <module> > app = PysimApp(card, rs, opts.script) > File "pySim-shell.py", line 59, in __init__ > super().__init__(persistent_history_file='~/.pysim_shell_history', allow_cli_args=False, use_ipython=True, auto_load_commands=False, command_sets=basic_commands, >startup_script=script) >TypeError: __init__() got an unexpected keyword argument 'use_ipython' If you run into this you can fix it by uninstalling cmd2 and reinstalling cmd2 with "pip3 install cmd2==1.5". Best, Bryan

1 year, 3 months

libosmocore/BSC/MSC: MO voice calls rejected from Siemens S11E (patch included)

by Lennart Müller

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

1 year, 4 months

Problem while running NIB on Open Cellular Base sation

by Brackley Casinga

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

1 year, 4 months

Osmo-BTS tx-attenuation

by Justin Mark Repollo

Hi Osmocom Community, May I ask your help on this. We have a test setup with UmTrx 2.3.2 SDR. We are trying to set the tx-attenuation and measure the power output but it seems it doesn't reflect based on the defined configurations. We tried to set 0, 5, 10 as values and below are the results. [image: 0-02-03-588e9973ceef2e018e29c0b2eb576f5b7d26972bbb779b44f79c97408d360299_1c6daee34bf8ee.jpg] [image: 0-02-06-99d6d7ce8551b10be62ea130c638b19c5475b5b4140bf2843b92a5b55d36c67c_1c6daee34bfeec.jpg] Please see attached files for osmo configurations and logs. Thanks! Regards, Justin

2 years, 7 months

Osmocom binary package repository URLs have changed

by Oliver Smith

Hello various Osmocom mailing lists, as previously announced (https://osmocom.org/news/191): * The binary packages are being built on Osmocom's own OBS server now. * We will stop pushing packages to the openSUSE OBS server at the end of October (in one week). If you are using Osmocom binary packages, please make sure that you have configured the new repository URLs. See the wiki for details: https://osmocom.org/projects/cellular-infrastructure/wiki/Binary_Packages Best, Oliver -- - Oliver Smith <osmith(a)sysmocom.de> https://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

2 years, 7 months

Question about Commit 47afc424c3: gprs_ns2: implement BLOCK/UNBLOCK of a NSVC by vty

by Alexander Rehbein

Hello, in the changes to `src/gb/gprs_ns2_vc_fsm.c` (see subject line), I found a few lines that puzzle me (as a newbie to the Osmocom codebase(s), they look like an error to me): ``` case GPRS_NS2_EV_REQ_OM_UNBLOCK: /* vty cmd: unblock*/ if (!priv->om_blocked) return; priv->om_blocked = false; if (fi->state == GPRS_NS2_ST_BLOCKED) osmo_fsm_inst_state_chg(fi, GPRS_NS2_ST_BLOCKED, nsi->timeout[NS_TOUT_TNS_BLOCK], 0); break; ``` To me it seems like the 'new_state' argument should be `GPRS_NS2_ST_UNBLOCKED`, since we are trying to unblock (that's what the `event` case says here from my understanding). What am I misunderstanding here? Cheers, Alex

2 years, 8 months

no calls in 2G network

by CRX

Hey, i am trying to build a 2G network with an ip.access BTS (Model 165G DCS1800). So far I can see the network on the RF spectrum and SMS delivery is working fine. Unfortunately I cant send calls to other phones. The open-bsc sends a lot of error messages to the log when the BTS is booting, I am not sure if my configuration is ok. As attachments there are my configs and the logs of open-bsc and osmo-msc. Thanks for your Help! regards crx

2 years, 8 months

OsmoDevCall on Oct 19, 2022: SIMtrace2 Tutorial

by Harald Welte

Dear Osmocom community, after a rather extended 2022 summer break, we're happy to announce the next incarnation of OsmoDevCall. Based on the recent polls, the timing has shifted to *every 3rd wednesday of the month*! when: October 19, 2022 at 20:00 CEST where: https://meeting5.franken.de/b/har-xbc-bsx-wvs In this edition, I will be presenting a SIMtrace2 tutorial, showing SIM card protocol tracing, decoding with the new pySim-trace as well as the card emulation firmware. This meeting will have the following schedule: 20:00 meet + greet 20:10 presentation as outlined above 21:00 unstructured supplementary social event [*] Attendance is free of charge and open to anyone with an interest in Osmocom or open source cellular technologies. 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 soon! 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)

2 years, 8 months

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OpenBSC October 2022