- OpenBSC - lists.osmocom.org

OsmoDevCon talk: Your favorite Osmocom related productivity tips and tools

by Oliver Smith

Hi all, I'm making a talk about tips and tools for doing more effective Osmocom related development. Some ideas I have for it currently: * how to build your own (deb, rpm) packages with OBS * how to run CI stuff (like the checkpatch linter) locally * running tcpdump over SSH and piping it into wireshark * finding what regression caused a ttcn-3 failure systematically Is there anything (within this list or other ideas) you would find particularly interesting, or boring? If you have a couple of tips or tools to share, and would like to present them yourself: let me know as well, then we could turn this into a quick lightning talk series with multiple presenters. Best, Oliver -- - Oliver Smith <osmith(a)sysmocom.de> https://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Siemensstr. 26a * 10551 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Director: Harald Welte

2 days, 21 hours

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osmo-bsc, mgw and AoIP Transport Layer Address

by jheyrendt.ext＠orange.com

Dear experts We try to configure osmo-bsc / osmo-mgw to be able to communicate with ERICSSON MSC/MGW. The UE is well registered but we don't know how to well configure bsc. We have this config file osmo-bsc.cfg: - 172.20.10.10 is a local BSC address to communicate to STP, MSC, MGW osmo-bsc mgw 0 local-ip 172.20.10.10 local-port 2427 remote-ip 172.20.10.10 remote-port 2727 reset-endpoint rtpbridge/* We have on the BSC a local mgw, and here is the osmo-mgw.cfg file: 172.20.10.19 is another address on the BSC towards the osmo-bts-trx. osmo-mgw mgcp domain mgw bind ip 172.20.10.10 bind port 2727 rtp port-range 4002 16001 rtp bind-ip 172.20.10.19 rtp ip-probing rtp ip-dscp 0 rtp keep-alive once rtcp-omit rtp-patch ssrc rtp-patch timestamp no rtp-patch rfc5993hr sdp audio-payload send-ptime sdp audio-payload send-name number endpoints 512 osmux off Sure we made errors and misunderstood. During test call, we can see in the trace, a Call proceeding, then a BSSMAP Assignment Request followed by a BSSMAP Assignment Complete. The problem is that the IP choosen as AoIP Transport Layer Address is the OAM address of the BSC (seen in In GSM A-I/F BSSMAP Assignment Complete trace section - UDP port 4004). How to change this in order to set 172.20.10.10 as the AoIP Transport Layer Address ? Many thanks in advance, best regards Jean-Marc

6 days, 13 hours

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Re: error in libosmosccp

by Harald Welte

Dear Sandeep, > checking for LIBOSMOCORE... no > configure: error: Package requirements (libosmocore >= 1.9.0) were not met: > > Package 'libosmocore', required by 'virtual:world', not found I'm sorry to say, but if that message is not specific/helpful enough, then you do not appear to be a Linux software developer with sufficient background to build software packages from source code. Nothing about this is osmocom speficic. In this case I'd strongly advise to simply use the pre-built binary packages we release, exactly for users who are users and not developers. See https://osmocom.org/projects/cellular-infrastructure/wiki/Binary_Packages Thanks for your understanding, Harald -- - 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)

1 week, 2 days

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error in libosmosccp

by Sandeep Kumar

Dera Team, I am facing this error. [root@ip-172-31-27-63 libosmo-sccp]# ./configure.ac ./configure.ac: line 1: dnl: command not found ./configure.ac: line 2: syntax error near unexpected token `[libosmo-sccp],' ./configure.ac: line 2: `AC_INIT([libosmo-sccp],' [root@ip-172-31-27-63 libosmo-sccp]# Kindly help here . Thanks . Regards, Sandeep Malik

1 week, 4 days

2
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E1 to IP with iCE40 E1 USB interface

by Alina Androne

Hello, How can I utilize the iCE40 E1 USB adapter to transition from E1 to IP in a GSM network, connecting a physical Siemens BSC (which has a BTS connected) to OsmoMSC? Only the BTS and BSC are physical. I already have osmo-e1d installed. Should I use osmo-e1d or dahdi version for this transition? What would be the best approach to begin the process? Regards, Alina

2 weeks, 3 days

3
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Channel Requests not being responded when running CS-only 2G network

by JPichel

Hi, I am trying to setup a simple Network In The Box 2G network. I am only interested in CS capabilities (voice calls, SMS, USSD). I am currently running the following elements with the default configurations: - osmo-bts-trx (connecting to osmo-trx-uhd driving a USRP B205mini-i) - osmo-bsc - osmo-msc - osmo-hlr - osmo-mgw - osmo-stp I built all the programs from source on Ubuntu 22.04. Everything is running locally on one machine. Everything seems to function correctly at first, but I noticed that sometimes when I try to execute an USSD code or make a call, my Channel Requests are not being responded. I noticed when this happens, osmo-bts shows the following notice: DPCU notice PCU socket not connected, dropping message (pcu_sock.c:1018) As I understand from the documentation (https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…), this component is not required for circuit switched services as the ones I am requesting, so I do not understand why this is happening. I assume something in the configuration files is telling the BTS or some network element that the PS side of the network is active, but I haven't found anything related to PCU in any of configuration files.

2 weeks, 3 days

5
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GSMTAP new version (3?)

by Mauro Levra

Dear Osmocom developers, In our project we have been using the gsmtap pseudo-header to store UMTS and LTE signalling traces in pcapng format. This is very efficient compared to our previous implementation based on DLT_USER, and thanks to the gsmtap dissector, it allows any *shark app to read our output file. When looking for the proper type and sub_type for NR signalling traces, I discovered they are not yet part of the standard. I found several threads of discussion about this, from about 2017 onwards, and I understand it is a matter of time and resources if the version 3 of GSMTAP has not been released. The most interesting feature I have read about is the ability to extend the header with a TLV approach. EARFCN, eNodeB-ID, PCI, are useful metadata we would like to add to our traces. In an ideal world, I would like things to be put in motion so that a new version of GSMTAP could see the light. More humbly, I ask you what kind of help is needed. Are you waiting for a draft specification? Are all requirements well known? I suppose that LTE and NR are not the main focus today for liboscmocore development, but there are many projects out there waiting for the GSMTAP format to be updated. Thanks! Mauro

2 weeks, 5 days

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DevCon: CSFB proposol / a general playground

by Keith

While I'm here looking at the mailing list, I have been thinking about asking about the following, and no need to delay it, I suppose - Upcoming OsmoDevCon attendees may have noticed the proposed and scheduled session on CSFB testing. Well, since - and sort of because that session was accepted, (and also an iPhone 6 that supports the band of an eNB I have at home dropped into my possession) - I've been prompted to advance my knowledge and understanding of issues, and the iPhone (6 at least) is now doing MO CSFB perfectly, and I think I see what some other observed issues are about. I'm still happy if there's interest to do the session of course, although maybe some might question whether it is more productive to just file tickets/issues and work them out the usual way. This email is not to suggest in any way to cancel the session, but rather to ask if maybe we might expand the scope. I'm thinking for example also testing 2G data. The older basic 2G + GPRS "chocolate bar" type phones I have don't work anymore, they used to. (not sure what one might actually do with such a device and GPRS these days, but that's not the point, right?) Someone (vadim?) brought a 2G (was it a credit card?) terminal once to devcon. Does it work? that kind of thing. So thinking about all this, I'm asking the question of whether there is interest to have a kind of events style setup during the conference. lynxis I think has a server for that, or maybe it's only a VM? I don't mean a distracting always-on setup, and I don't mean to put emphasis on cellular projects. But if we did want to have something multi RAT, available for anybody who might want to glance in that direction (during a USSE for example), then some (small) amount of logistics preparation is necessary, no? Thanks. k.

4 weeks, 1 day

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PyHSS / pyhss-tool

by Harald Welte

Hi all, While working with open5gs + kamailio, one traditionally always needed two HSS: * the open5gs one with its mongodb and nodejs hell * the FHoSS one for the kamailio IMS core For some time there's now PyHSS, which supports both EPS and IMS subscriptions, which is of course nice. docker_open5gs meanwhile also has switched to using it as default. The big problem is that it doesn't actually state which license it is under, which makes it legally impossible to [re]distribute it, or to even make a fork of the repository, as that would be a violation of copyright. At least German users are abel to legally use it, as under German copyright law you don't need a license from the copyright holder to use a program that you have obtained legally. In order to automatize the steps described in the open5gs_docker to create subscribers, I've just hacked up a small tool, see https://gitea.osmocom.org/laforge/pyhss-tool/src/branch/master/pyhss-tool.py Using that tool, it's as easy as pyhss-tool.py subscriber-create --imsi 001011111111111 --msisdn 1111 --k 000102030405060708090a0b0c0d0e0f --opc 00000000000000000000000000000000 or pyhss-tool.py subscriber-delete --imsi 001011111111111 to add/remove subscribers. You will still need to manually create the internet and ims APNs via the REST interface; I'll probably also add that capability to the tool. Once it's a bit more tested, I also would like to contribute it upstream, at least once that is possible. To do that I'd have to make a pull request, and making that pull request requires me to create a fork, which is a copyright violation. wtf. If that legal situation has cleared up, it might be worth considering either adding native GSUP support to PyHSS (so it can be used by osmo-{msc,sgsn}, or to have a converter like osmo_gsup2dia (the inverse of the existing osmo_dia2gsup). Regards, Harald -- - Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

1 month

4
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Master NURS FPX 4000 Assessments with Expert Online Tutoring

by fortyquin93＠gmail.com

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1 month

1
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Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

by williammores96＠gmail.com

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1 month, 1 week

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0 0

Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

by williammores96＠gmail.com

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1 month, 1 week

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Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

by williammores96＠gmail.com

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1 month, 1 week

1
0
0 0

Re: OSMO-BSC, OSMO-PCU PCU & SGSN Ericsson

by jheyrendt.ext＠orange.com

Hi Many thanks Harald for you answer Yes, Ericsson SGSN MKX uses Classic mode (not ip-sns), and the osmo-pcu is configured with this line: gb-dialect classic. We took the time to check the SGSN, BSC & network configuration and all seems well configured. We continue to check and test but no way for now to correct this NS initialization step, and this error: NS_STATUS, Cause PROTOCOL ERROR - unspecified. So, if you have other ideas of what could be the problem, you're welcome. In addition, if you know someone who had set up this configuration, we would be very interested by he way of BSC and BTS, SGSN were configured. Best regards Jean-Marc Orange Restricted ____________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.

1 month, 1 week

1
0
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OSMO-BSC, OSMO-PCU PCU & SGSN Ericsson

by jheyrendt.ext＠orange.com

Dear experts, We are trying to connect an osmocom platform to an Ericsson platform, and are trying to make funtional 2G. We use a VM for OSMO-BSC, a VM for OSMO-BTS-TRX + OSMO-PCU, and a Raspberry PI (trx-lms) Concerning the Gb, we connected the OSMO-PCU to an MKX Ericsson, and we have an error at the NS setup step. The communication between the SGSN Ericsson and the OSMO-PCU seems ok (IP / routing OK) We hope that the Ericsson MKX SGSN is well configured. We can see some packets: OSMO-PCU ---> SGSN : NS_RESET, Cause: P&M intervention, NS VCI: 0x1388, NSEI: 5000 and a response from the SGSN: NS_STATUS, Cause PROTOCOL ERROR - unspecified. What could be the problem ? timers ? ns-vci, nsvc 1, encapsulation,... Did someone test this: OSMOCOM with an ERICSSON SGSN ? One point is that the nsvci is only defined on the BSC (not on the SGSN) Many thanks in advance, Best regards Hoping that you could help us Jean-Marc ----------------------- BSC CONFIGURATION ----------------------- bts 0 type osmo-bts description LimeSDR Based BTS band GSM900 cell_identity 41023 location_area_code 390 base_station_id_code 63 ms max power 15 cell reselection hysteresis 4 rxlev access min 0 radio-link-timeout 32 channel allocator mode chan-req ascending channel allocator mode assignment ascending channel allocator mode handover ascending channel allocator mode vgcs-vbs ascending rach tx integer 9 rach max transmission 7 rach max-delay 63 channel-description attach 1 channel-description bs-pa-mfrms 5 channel-description bs-ag-blks-res 1 no nch-position no access-control-class-ramping early-classmark-sending forbidden early-classmark-sending-3g allowed ipa unit-id 901 0 oml ipa stream-id 255 line 0 neighbor-list mode automatic codec-support fr 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 nsei 5000 gprs nsvc 0 nsvci 5000 gprs nsvc 0 local udp port 23001 gprs nsvc 0 remote ip 172.20.168.220 gprs nsvc 0 remote udp port 2157 ... ----------------------- PCU CONFIGURATION ----------------------- ns timer tns-block 3 timer tns-block-retries 3 timer tns-reset 3 timer tns-reset-retries 3 timer tns-test 30 timer tns-alive 3 timer tns-alive-retries 10 timer tsns-prov 3 timer tsns-size-retries 3 timer tsns-config-retries 3 timer tsns-procedures-retries 3 pcu flow-control-interval 10 cs 2 cs max 4 cs threshold 10 33 cs downgrade-threshold 200 cs link-quality-ranges cs1 6 cs2 5 8 cs3 7 13 cs4 12 mcs link-quality-ranges mcs1 6 mcs2 5 8 mcs3 7 13 mcs4 12 15 mcs5 14 17 mcs6 16 18 mcs7 17 20 mcs8 19 24 mcs9 23 mcs max 9 window-size 64 0 queue idle-ack-delay 10 queue codel

1 month, 2 weeks

2
1
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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 month, 2 weeks

4
4
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[wireshark] GSMTAP: check version field

by Mauro Levra

Hello everyone, Could any of you please review the merge request "GSMTAP: check version field" [1]? The purpose is to check the content of the 'version' field in gsmtap header and act in case of unknown versions. Cheers, Mauro [1] https://gitlab.com/wireshark/wireshark/-/merge_requests/14623

1 month, 3 weeks

1
0
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pycrate repo update

by benoit michau

Dear osmocom developpers, This is just to let you know that the Python library pycrate has a new home : https://github.com/pycrate-org/pycrate. The packages on Pypi are now feeded from there. This library can be used in many cases dealing with mobile signalling. I wanted to let you know, as even if I am not aware of any osmocom projects depending on it, some of you may use the library from time to time, or could have local applications depending on it. Best Regards Benoit

1 month, 3 weeks

1
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SDP API choices

by Neels Hofmeyr

Hi all, I'm currently working on 2G to 3G TrFO voice negotiation. In practice, that means, to be able to negotiate a set of AMR rates via SDP. And that, in turn, means that we handle fmtp properly in SDP strings. SDP is not only used in SIP to the other call leg, but also in the MGCP to the media gateway. - So we have a bunch of SDP and fmtp related code in osmo-mgw.git. - Separately, we have an SDP implementation in osmo-msc.git, because the SDP code in osmo-mgw.git was too tightly coupled with other code to be able to reuse it for MNCC->SIP. For fmtp negotiation, I now want similar things in both mgw and msc. What I want to do now, is move the SDP implementation from osmo-msc.git to osmo-mgw.git/libosmo-mgcp-client and make it public API: a common place that will also enable all other MGCP clients to work with AMR fmtp. All of this was just the intro =) the question I would like to put out there is about API design: static or dynamic, and opaque or transparent. Am I overthinking this? Or would you like to overthink it with me? == static or dynamic == In osmo-msc.git, the SDP structs so far are fully static and self-contained. The cool thing is that they can be copied around quite easily and there is no need for passing talloc ctx pointers, no need to worry about ownership, memleaks and double frees. But it also means that it uses fixed sizes: - char encoding_name[16], - char fmtp[256], - struct sdp_audio_codec codecs[32] and so on. Unfortunately, RFC-8866 does not define any limits whatsoever on number of characters or number of codecs in an SDP message. Quoting: "although no length limit is given, it is recommended that they be short" Thanks for nothing! >:( So for static API design, we need to now pick a good size for every single item in advance. When fmtp has max 256 bytes and codec lists have max 32 entries, even an empty list will use 32 * 256+ bytes: lots of heap allocations. And the limits are hard: anyone wanting to correctly express more than 32 different codec variants can simply not use this library. Dynamic seems a much better fit for RFC-8866. There is practically no limit at all on string length / list length. Also the caller allocates not one byte more memory than is actually needed. The argument has been going back and forth in my head for weeks. Static makes things so much simpler. But what sizes should we dictate. Ok then dynamic. But these days we have "infinite" memory, the bottleneck is CPU time, so if we can be static, we are gracious on very cheap real estate (memory) while saving a lot of the precious stuff (cycles). Ok then static. But with all those AMR variants that are coming up, I want to at least be able to represent all of them in one list, so I need at least 64 entries. And let's allow long fmtp strings, who knows. Then we'll end up with ~20kb of data that every codec list out there will use up, even if it is empty. Even if it is just a temporary local variable. Even if it is just dragged along for a rare use case and never actually needed. Is it really faster to allocate 100 times more memory statically versus allocating just enough but dynamically? In the end I decided for dynamic allocation. When I started adding talloc ctx args, I wanted the API to be simple, so every single part of the puzzle is now its own dynamic allocation: struct osmo_sdp_msg { char *username; // talloc_strdup() char *session_name; // talloc_strdup() [...] struct osmo_sdp_codec_list *codecs; // osmo_sdp_codec_list_alloc() // llist_head // -> osmo_sdp_codec_alloc() // \___ char *encoding_name -> talloc_strdup() // _ char *fmtp -> talloc_strdup() // -next-> osmo_sdp_codec_alloc() // \___ ... // -next-> osmo_sdp_codec_alloc() // \___ ... }; All of this used to be just a single self-contained struct. You might ask, why is 'codecs', which is just the llist_head, a separate allocation? Because I want the API to trivially figure out the talloc parent context to allocate items from: osmo_codec_list_add(my_list, my_codec); and not have to worry about the individual code paths' parent context to allocate new entries from: osmo_codec_list_add(&my_obj->my_list, my_obj->backpointer.backpointer.ctx, my_codec); So the only functions with a talloc ctx argument are osmo_codec_alloc(ctx) and osmo_codec_list_alloc(ctx) This style has a tendency to spread: Now I want to also make osmo-msc's struct codec_filter a dynamic allocation, because the codec_filter_foo() currently have no ctx argument; they still use the static SDP structs. When the codec_filter pointer itself is the neat logical talloc parent of the codec lists it uses, then I don't need to add a separate ctx arg everywhere now. Am I taking this too far now? Am I overthinking it and either way is fine? == opaque vs transparent == I can either have the full struct definition in the .h file = transparent, or I can hide the struct in the .c file and provide lots of getter and setter functions = opaque. Both ways have a major advantage over the other: - opaque means that we can freely extend the API without any ABI breakage, ever. - transparent means that callers can easily define const arrays of data structures. In my case, I want to keep const lists of const codecs for e.g. test data in unit tests, for listing known codecs in codec_mapping.c, for defining default codec configuration. transparent allows: const struct osmo_sdp_codec ran_defaults = { { .encoding_name = "AMR", .rate = 8000, .fmtp = "octet-align=1;mode-set=0,2,4,7", .payload_type = 112, }, { .encoding_name = "AMR", .rate = 8000, .fmtp = "octet-align=1;mode-set=0,2,4", .payload_type = 112, }, { .encoding_name = "AMR", .rate = 8000, .fmtp = "mode-set=0,2,4,7", .payload_type = 112, }, { .encoding_name = "AMR", .rate = 8000, .fmtp = "mode-set=0,2,4", .payload_type = 112, }, { .encoding_name = "GSM-EFR", .rate = 8000, .payload_type = 110, }, { .encoding_name = "GSM", .rate = 8000, .payload_type = 3, }, { .encoding_name = "GSM-HR-08", .rate = 8000, .payload_type = 111, }, }; int i; for (i = 0; i < ARRAY_SIZE(ran_defaults); i++) osmo_sdp_codec_list_add(g_ran_codecs_cfg, &defaults[i]) printf("%s", codec->encoding_name); if (!strcmp(codec->encoding_name, "AMR")) printf(":%s", codec->fmtp); same in opaque: osmo_sdp_codec_list_add(g_ran_codecs_cfg, "AMR", 8000, "octet-align=1;mode-set=0,2,4,7", 112); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "AMR", 8000, "octet-align=1;mode-set=0,2,4", 112); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "AMR", 8000, "mode-set=0,2,4,7", 112); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "AMR", 8000, "mode-set=0,2,4", 112); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "GSM-EFR", 8000, NULL, 110); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "GSM", 8000, NULL, 3); osmo_sdp_codec_list_add(g_ran_codecs_cfg, "GSM-HR-08", 8000, NULL, 111); printf("%s", osmo_sdp_codec_get_encoding_name(codec)); if (!strcmp(osmo_sdp_codec_get_encoding_name(codec), "AMR")) printf(":%s", osmo_sdp_codec_get_ftmp(codec)); The opaque looks alright in comparison, but - being able to enlist a struct osmo_sdp_codec in a const array is powerful, allowing the paradigm to replace code complexity by good data structures. So used in codec_mapping.c in osmo-msc. - requiring getters and setters for each end every member creates a long list of API functions: 'get' and 'set' for each orthogonal member; we might be tempted to "dupe" many llist_*() functions for osmo_sdp_codec_list. - having to call functions for each end every member makes the code a lot more noisy. - it forces all allocation decisions down onto the caller = only using the API author's favorite dynamic allocation, hello memleaks etc. IMHO, opaque APIs are often lots of code with very low density of actually important stuff. /* This function gets foo. */ struct foo *get_foo(x) { return x->foo; } This is so plump and boring!! Currently I am following the transparent way, and putting 'bool v2;' extension flags for a distant future in the structs' ends. But there has been a discussion here that the truly good APIs are opaque. talloc, libSDL, libsndfile come to mind. == both == Finally, these two aspects are interdependent: An opaque API *has* to be dynamic. So far, I am moving from the transparent+static implementation to transparent+dynamic. Should I also go the "next" step to opaque+dynamic? I don't really want to... I've had these considerations many times in my life, and there never seems to be the one best way. Thanks for your thoughts! If you need more code reference for what I am talking about: old static: https://cgit.osmocom.org/osmo-msc/tree/include/osmocom/msc/sdp_msg.h?id=1b1… https://cgit.osmocom.org/osmo-msc/tree/src/libmsc/sdp_msg.c?id=1b1a39bea1c5… new dynamic+transparent: https://cgit.osmocom.org/osmo-mgw/tree/include/osmocom/sdp?h=neels/sdp&id=2… https://cgit.osmocom.org/osmo-mgw/tree/src/libosmo-sdp?h=neels/sdp&id=24c09… ~N -- - 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

1 month, 4 weeks

2
3
0 0

ERROR Trying to dispatch event 17 to non-existent FSM instance!

by JPichel

Hi, I hope this is the place to ask this, if not I will delete this post. I am trying to run my own 2G network for researching purposes. I am running the following elements: - osmo-bts-trx (connecting to osmo-trx-uhd driving a USRP B205mini-i) - osmo-bsc - osmo-msc - osmo-hlr - osmo-mgw I built all the programs from source on Ubuntu 22.04. Everything is running locally on one machine. Everything seems to be running OK. I was able to register two different subscribers by IMSI (without providing K and OPc) and assign MSISDN tothem. They can use the default USSD codes for seeing their IMSI and their MSISDN and I can make voice calls between both subscribers. I am mostly using the default config files provided with the installation, the only changes I made to them was to point IPs to 127.0.0.1 to run everything on the same machine. But when starting osmo-bsc and osmo-msc I get the same error on both: jonathan@em680:~/tfg/osmo/config$ osmo-msc -c osmo-msc.cfg DLGLOBAL NOTICE Available via telnet 127.0.0.1 4254 (telnet_interface.c:88) DLCTRL NOTICE CTRL at 127.0.0.1 4255 (control_if.c:1014) DLGSUP NOTICE GSUP connecting to 127.0.0.1:4222 (gsup_client.c:74) DDB NOTICE Init database connection to 'sms.db' using SQLite3 lib version 3.37.2 (db.c:521) DLMGCP NOTICE MGW(mgw) MGCP client: using endpoint domain '@mgw' (mgcp_client.c:933) DMSC NOTICE MGW pool with 1 pool members configured, (ignoring MGW configuration in VTY node 'msc'). (msc_main.c:596) DLSCCP NOTICE OsmoMSC-A: Creating SS7 instance (sccp_user.c:536) DLSCCP NOTICE OsmoMSC-A: Using SS7 instance 0, pc:0.23.1 (sccp_user.c:563) DLSCCP NOTICE OsmoMSC-A: Creating AS instance (sccp_user.c:570) DLSCCP NOTICE OsmoMSC-A: Using AS instance as-clnt-OsmoMSC-A (sccp_user.c:581) DLSCCP NOTICE OsmoMSC-A: Creating default route (sccp_user.c:587) DLSCCP NOTICE OsmoMSC-A: No unassociated ASP for m3ua, creating new ASP asp-clnt-OsmoMSC-A (sccp_user.c:626) DLGLOBAL ERROR Trying to dispatch event 17 to non-existent FSM instance! (osmo_ss7_as.c:118) DLGLOBAL ERROR backtrace() returned 11 addresses (backtrace.c:42) DLGLOBAL ERROR /usr/local/lib/libosmocore.so.21(osmo_log_backtrace+0x24) [0x7fc1ddd9fdcc] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmocore.so.21(_osmo_fsm_inst_dispatch+0x144) [0x7fc1dddaade7] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmo-sigtran.so.9(osmo_ss7_as_add_asp+0x1f9) [0x7fc1ddcfb80c] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmo-sigtran.so.9(osmo_sccp_simple_client_on_ss7_id+0xa48) [0x7fc1ddd1dd5e] (backtrace.c:53) DLGLOBAL ERROR osmo-msc(+0x26fd8) [0x55fa5388bfd8] (backtrace.c:53) DLGLOBAL ERROR osmo-msc(+0x27043) [0x55fa5388c043] (backtrace.c:53) DLGLOBAL ERROR osmo-msc(+0x27bed) [0x55fa5388cbed] (backtrace.c:53) DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7fc1dd95fd90] (backtrace.c:53) DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7fc1dd95fe40] (backtrace.c:53) DLGLOBAL ERROR osmo-msc(+0x26565) [0x55fa5388b565] (backtrace.c:53) DLSCCP NOTICE OsmoMSC-A: Using ASP instance asp-clnt-OsmoMSC-A (sccp_user.c:695) DLSS7 NOTICE 0: Creating SCCP instance (osmo_ss7.c:408) DSGS NOTICE SGs socket bound to r=NULL<->l=0.0.0.0:29118 (sgs_server.c:186) DMSC NOTICE A-interface: SCCP user OsmoMSC-A:RI=SSN_PC,PC=(no PC),SSN=BSSAP, cs7-instance 0 ((null)) (msc_main.c:806) DLINP NOTICE 127.0.0.1:4222 connection done (ipa.c:141) DLINP NOTICE received ID_GET for unit ID 0/0/0 (ipaccess.c:919) DLM3UA NOTICE 0: asp-asp-clnt-OsmoMSC-A: Received NOTIFY Type State Change:AS Inactive () (m3ua.c:625) DLSS7 NOTICE xua_default_lm(asp-clnt-OsmoMSC-A)[0x55fa542bb080]{ACTIVE}: Ignoring primitive M-ASP_ACTIVE.confirm (xua_default_lm_fsm.c:400) DLM3UA NOTICE 0: asp-asp-clnt-OsmoMSC-A: Received NOTIFY Type State Change:AS Active () (m3ua.c:625) DLM3UA NOTICE 0: asp-asp-clnt-OsmoMSC-A: Rx DAVA() for 0.23.3/0, (xua_snm.c:403) ... jonathan@em680:~/tfg/osmo/config$ osmo-bsc -c osmo-bsc.cfg DLGLOBAL NOTICE Available via telnet 127.0.0.1 4242 (telnet_interface.c:88) DLINP NOTICE enabling ipaccess BSC mode on 0.0.0.0 with OML 3002 and RSL 3003 TCP ports (ipaccess.c:1055) DLCTRL NOTICE CTRL at 127.0.0.1 4249 (control_if.c:1014) DLMGCP NOTICE MGW(mgw) MGCP client: using endpoint domain '@mgw' (mgcp_client.c:933) DNM NOTICE MGW pool with 1 pool members configured, (ignoring MGW configuration in VTY node 'msc'). (osmo_bsc_main.c:889) DMSC NOTICE To auto-configure msc 0, creating cs7 instance 0 implicitly (osmo_bsc_sigtran.c:600) DMSC NOTICE Initializing SCCP connection for A/m3ua on cs7 instance 0 (osmo_bsc_sigtran.c:647) DLSCCP ERROR SS7 instance 0: no primary point-code set, using default point-code (sccp_user.c:557) DLSCCP NOTICE A-0-m3ua: Using SS7 instance 0, pc:0.23.3 (sccp_user.c:563) DLSCCP NOTICE A-0-m3ua: Creating AS instance (sccp_user.c:570) DLSCCP NOTICE A-0-m3ua: Using AS instance as-clnt-A-0-m3ua (sccp_user.c:581) DLSCCP NOTICE A-0-m3ua: Creating default route (sccp_user.c:587) DLSCCP NOTICE A-0-m3ua: No unassociated ASP for m3ua, creating new ASP asp-clnt-A-0-m3ua (sccp_user.c:626) DLGLOBAL ERROR Trying to dispatch event 17 to non-existent FSM instance! (osmo_ss7_as.c:118) DLGLOBAL ERROR backtrace() returned 10 addresses (backtrace.c:42) DLGLOBAL ERROR /usr/local/lib/libosmocore.so.21(osmo_log_backtrace+0x24) [0x7f990ff0ddcc] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmocore.so.21(_osmo_fsm_inst_dispatch+0x144) [0x7f990ff18de7] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmo-sigtran.so.9(osmo_ss7_as_add_asp+0x1f9) [0x7f990fe9380c] (backtrace.c:53) DLGLOBAL ERROR /usr/local/lib/libosmo-sigtran.so.9(osmo_sccp_simple_client_on_ss7_id+0xa48) [0x7f990feb5d5e] (backtrace.c:53) DLGLOBAL ERROR osmo-bsc(+0x144035) [0x556b310d7035] (backtrace.c:53) DLGLOBAL ERROR osmo-bsc(+0x2aef0) [0x556b30fbdef0] (backtrace.c:53) DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7f990fc55d90] (backtrace.c:53) DLGLOBAL ERROR /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7f990fc55e40] (backtrace.c:53) DLGLOBAL ERROR osmo-bsc(+0x28265) [0x556b30fbb265] (backtrace.c:53) DLSCCP NOTICE A-0-m3ua: Using ASP instance asp-clnt-A-0-m3ua (sccp_user.c:695) DLSS7 NOTICE 0: Creating SCCP instance (osmo_ss7.c:408) DMSC NOTICE A-0-m3ua msc-0: local (BSC) SCCP address: RI=SSN_PC,PC=0.23.3,SSN=BSSAP (osmo_bsc_sigtran.c:703) DMSC NOTICE A-0-m3ua msc-0: remote (MSC) SCCP address: RI=SSN_PC,PC=0.23.1,SSN=BSSAP (osmo_bsc_sigtran.c:705) DMSC NOTICE A-0-m3ua msc-0: binding SCCP user (osmo_bsc_sigtran.c:710) DLSS7 ERROR XUA_AS(as-clnt-A-0-m3ua)[0x556b31b42cc0]{AS_INACTIVE}: Event AS-TRANSFER.req not permitted (m3ua.c:510) DLM3UA NOTICE 0: asp-asp-clnt-A-0-m3ua: Received NOTIFY Type State Change:AS Inactive () (m3ua.c:625) DLSS7 NOTICE xua_default_lm(asp-clnt-A-0-m3ua)[0x556b31b445c0]{ACTIVE}: Ignoring primitive M-ASP_ACTIVE.confirm (xua_default_lm_fsm.c:400) DLM3UA NOTICE 0: asp-asp-clnt-A-0-m3ua: Received NOTIFY Type State Change:AS Active () (m3ua.c:625) DMSC NOTICE RESET ACK from MSC: RI=SSN_PC,PC=0.23.1,SSN=BSSAP (osmo_bsc_bssap.c:84) DRESET NOTICE bssmap_reset(msc-0)[0x556b31b45790]{CONNECTED}: link up (bssmap_reset.c:83) DMSC NOTICE (msc0) BSSMAP association is up (a_reset.c:45) DLINP NOTICE 0.0.0.0:3002 accept()ed new link from 127.0.0.1:38477 (ipa.c:318) DLINP NOTICE Keepalive is set: 0 (ipaccess.c:612) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'GPRS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'EGPRS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'HOPPING' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'MULTI_TSC' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'OML_ALERTS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'CBCH' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'SPEECH_F_V1' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'SPEECH_H_V1' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'SPEECH_F_EFR' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'SPEECH_F_AMR' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'SPEECH_H_AMR' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'ETWS_PN' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'PAGING_COORDINATION' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'IPV6_NSVC' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'ACCH_REP' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'CCN' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'VAMOS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'ABIS_OSMO_PCU' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'BCCH_PWR_RED' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'DYN_TS_SDCCH8' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'ACCH_TEMP_OVP' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'VBS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Get Attributes Response: feature 'VGCS' is supported (abis_nm.c:599) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): ARI reported sw[0/2]: osmobts is 1.7.0.54-82a2 (abis_nm.c:652) DNM NOTICE OC=BTS(01) INST=(00,ff,ff): Reported variant: osmo-bts-trx (abis_nm.c:534) DNM ERROR OC=RADIO-CARRIER(02) INST=(00,00,ff): Attribute SW Configuration is unreported (abis_nm.c:557) DNM ERROR OC=BASEBAND-TRANSCEIVER(04) INST=(00,00,ff): Attribute Manufacturer Dependent State is unreported (abis_nm.c:557) DNM NOTICE OC=BASEBAND-TRANSCEIVER(04) INST=(00,00,ff): ARI reported sw[0/1]: TRX_PHY_VERSION is Unknown (abis_nm.c:652) DLINP NOTICE 0.0.0.0:3003 accept()ed new link from 127.0.0.1:37491 (ipa.c:318) DLINP NOTICE Keepalive is set: 0 (ipaccess.c:612) ... Is it something I should worry about? Thanks

2 months, 2 weeks

2
1
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CRM Assignment Help at Your Fingertips

by fa318991＠gmail.com

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2 months, 2 weeks

1
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2 months, 2 weeks

1
0
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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

2 months, 3 weeks

6
6
0 0

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

2 months, 3 weeks

2
1
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Helping an Australian set up his own personal GSM/2G cell

by Mychaela Falconia

Hello Osmocom community, I have a contact in Australia who reached out to me with a desire to set up his own personal GSM/2G network. Australia is a nasty anti- retrotechnology country, even worse than USA, where all official 2G networks were shut down back in 2018. As most of you know, I run my own pirate-radio GSM cell in USA, and I tried reaching out to other Vintage Mobile Phone communities, promoting the idea that people can run their own networks using Osmocom CNI plus suitable hw plus my ThemWi add-ons for outside PSTN interconnection, and offering to teach others how to copy what I am doing. When I made the latter offer to the community, I was expecting people from other parts of USA - but right now the only person with an active interest is in Australia. I am currently teaching my Australian contact the "pure physics" aspects of running your own GSM network: what frequencies are usable for GSM, dB and dBm units of measurements, how to use a handheld spectrum analyzer etc. These are all "physics" topics that are independent of where one happens to be geopolitically. But there is another key aspect which I feel he needs to know, but which I won't be able to teach him: country-specific spectrum-political aspects. I know the spectrum-political landscape in USA: how FCC has divvied up PCS1900 and GSM850 bands (or B2 & B5 in modern parlance) between carriers, which spots in these bands are completely unused and thus reasonably safe to squat in, and how one can exploit the overlap between EGSM900 DL and USA ISM band to run a BTS with low probability of getting into trouble. But I have absolutely no such knowledge for any other country in the world, let alone one as remote and foreign to me as Australia. Is there anyone in this community who is based in Australia and knows this topic? I would greatly appreciate any advice from an AU-knowing person that I could pass to my GSM-enthusiast contact: out of the 4 frequency bands that are in-principle suitable for GSM, which is the safest one to squat in for a pirate operator, and which ARFCN range(s)? Obviously I will teach my contact that he needs to pick a spot where the spectrum analyzer shows nothing but noise floor, but just because a spot "looks blank" on an SA doesn't mean that the spot is safe to squat on, without knowing anything at all about the country's spectrum-political landscape... TIA, Mychaela

2 months, 3 weeks

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Osmocom with limesdr Mini 2.0

by jheyrendt.ext＠orange.com

Dear all We have a questions for you, experts. Has anyone managed to get Osmocom with limesdr Mini 2.0 ? (USB) We have stability issues, so if someone has tried and can share configuration for osmocom-bsc and osmocom-trx-lms, it woud be great ! Many thanks in advance, Best regards

2 months, 4 weeks

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Open Source Involvement

by Tanya P

Good Morning, My name is Tanya and was referred to this email regarding open source involvement. I am genuinely interested in sysmocom and am open to exploring various ways I can support your team. If there are any upcoming opportunities or specific areas where my skills could be of value in a volunteer capacity, I would be grateful for the chance to discuss them further. Please take a look at my GitHub profile: https://github.com/wonntann Thank you again for your consideration. I look forward to the possibility of contributing to sysmocom and will continue to follow your updates. Best, Tanya

3 months

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leave

by Roland Martinson

3 months, 3 weeks

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TCP port numbers for vty/ctrl/etc of 3rd-party programs

by Mychaela Falconia

Hello Osmocom community, I have a question about TCP port number assignment for programs using libosmovty. Every Osmo-official server program gets official port number assignments listed in the wiki, in PDF manuals etc - so far, so good. But what about non-Osmo-official 3rd-party programs that wish to use common Osmocom libraries, including the vty facility? Suppose that an operator of an Osmocom-based cellular network needs to develop some additional programs to satisfy some operational need, and some of these additional programs are long-lived server processes for which an Osmocom-style vty interface would be very useful. But implementing such a telnet vty i/f requires a TCP port number... Has anyone thought about designating an official range of TCP port numbers which would be recommended for vty/ctrl/etc ports of processes that use Osmocom libraries and extend Osmocom CNI in various ways, but aren't official Osmocom projects? M~

3 months, 3 weeks

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OsmoDevCon 2024 planning

by Harald Welte

Hi all! [cross-post to make sure everyone knows about it, please follow-up-to the osmodevcon(a)lists.osmocom.org mailing list for further discussion] As I mentioned several times at different occasions, I really think we should put together a OsmoDevCon again. In case you don't know what that is, please see https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCon We should have restarted already in 2023, but I really was too busy and it was a somewhat difficult year for me at times, sorry. Date ---- In terms of timing, I am thinking about "after April but before the main summer holiday season (June-August)". That leaves May. Given that May has the whitsunday weekend as well as GPN (Gulaschprogrammiernacht, a CCC event that will likely conflict of interest with some people interested at attending OsmoDevCon), I'm currently considering the following candidate dates: * May 3 to 6 * May 24 to 27 This is as usual a friday-to-monday timeframe, allowing people who don't work professionally on osmocom to attend just the two weekendd days, while others can attend the full 4 days. Venue ----- In terms of venue, I'm hoping we can move to a slightly different arrangement where the whole group stays together for the whole duration of the event - as opposed to everyone staying at different hotels and having to commute from hotel to venue and back every day. So something like a hotel with a sufficiently large meeting room, hotels and catering all day. And all of that ideally at a nice venue with some kind of park / outdoor area, not downtown at the city center. Yes, that will obviously come at a higher price tag than we're used to - but I'm confident we can get that covered between sponsors and sysmocom. Do you guys think this is a good idea? Or would you prefer the traditional ad-hoc approach at IN-Berlin? Regards, Harald -- - 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)

4 months

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libosmo-mgcp-devel built in RPM but not in deb

by Neels Hofmeyr

Hi all, does anyone have feedback on this dubious libosmo-mgcp-devel we publish in our osmo-mgw.spec? More detail in https://osmocom.org/issues/6300 Thanks! ~N -- - 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

4 months

1
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osmo-mgw: is anyone using the 'fmtp-extra' option?

by Neels Hofmeyr

Hi all, I'd like to drop the 'sdp audio fmtp-extra ...' cfg option from osmo-mgw. If this option needs to stay, I'd like to hear about that. There is more context in https://osmocom.org/issues/6313 Thanks! ~N -- - 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

4 months

1
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osmo-pcu, osmo-bts, osmo-bsc releases with PCUIF 12

by Oliver Smith

Dear mailing list, I'm looking into releasing a new osmo-pcu version to finish up OS#6198, and to have a release with the fix for OS#6191. Apparently that fix requires a new PCUIF version. And osmo-pcu master now has a check that requires the *exact* PCUIF version: https://cgit.osmocom.org/osmo-pcu/commit/?id=46140948d9800bca6a7b4299f08b25… pcu_i1_if.cpp: } else if (info_ind->version != PCU_IF_VERSION) { fprintf(stderr, "PCU interface version number of BTS/BSC (%u) is different (%u).\nPlease use a BTS/BSC with a compatble interface!\n", info_ind->version, PCU_IF_VERSION); exit(-1); } So we will need to create releases of osmo-bts and osmo-bsc with the new PCUIF version as well. As this is a breaking change, I think we should bump the major version, and that in turn makes more sense with tagging current master instead of cherry picking a few patches. So I propose to do the following: * tag a new libosmocore patch release with the few patches required for osmo-pcu, osmo-bts and osmo-bsc master (see their TODO-RELEASE). * tag major releases of osmo-pcu, osmo-bts and osmo-bsc from their current master Does that make sense? Best regards, 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

4 months, 2 weeks

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AMR mode-set

by Neels Hofmeyr

Hi Nick, I just read your post https://nickvsnetworking.com/tales-from-the-trenches-mode-set-in-amr/ and just when it really gets interesting, the article ends =) I'm working at osmocom.org and am currently figuring out how TH we are supposed to communicate the AMR mode sets across 2G + 3G mobile networking on the one side and SDP/SIP+RTP on the other side. My plan was to do it like choosing codecs: One side sends all its capabilities, the other responds with the own capabilites removing unsupported entries. Now I read in your post that mode-set is take-it-or-leave-it. The interesting part is the practical problem that arises from it: e.g. on a 2G mobile network, i'm allowed to choose up to four AMR rates, no more. When on a half-rate channel, then specific rates (12k2, 10k2) are not supported. Otherwise I can tell the 2G BTS and the phone to pick various mode-set combinations. So why not send a full mode-set of 0,1,2,3,4,5,6,7 and the other call leg can then say "i'll pick these four", or something like that. With your spec references, it means that now I need to pick specific mode-set combinations in advance, and assign a different payload type number to each of them. The extreme example would be: a rtpmap:110 AMR/8000/1 a fmtp:110 mode-set=0 a rtpmap:111 AMR/8000/1 a fmtp:111 mode-set=1 a rtpmap:112 AMR/8000/1 a fmtp:112 mode-set=2 ... a fmtp:117 mode-set=7 a fmtp:118 mode-set=0,1 a fmtp:119 mode-set=0,2 a fmtp:120 mode-set=0,3 a fmtp:121 mode-set=0,4 ... a fmtp:99999998 mode-set=0,1,2,3,4,5,6 a fmtp:99999999 mode-set=0,1,2,3,4,5,6,7 Obviously nonsense, but you catch my drift. So what is the solution then? In 2G GSM I have half-rate and full-rate channels; AMR-FR and AMR-HR should be able to interop. So if one FR side offers mode-set=0,2,4,7 then the HR side may return mode-set=0,2,4 to leave only HR compatible rates. Well, no. If not that, then: I probably need to create one RTPMAP entry for full-rate compatible operation and another entry for half-rate compatible operation. 111:mode-set=0,2,4,7 112:mode-set=0,2,4 Also some hardware supports only 12k2, so then I need to add an extra entry for only 12k2. But I have to so not only on the side that has the 12k2 limit, but on the side that wants to interop with it! Because if the peer doesn't offer a single "mode-set=7", then the only-12k2 supporting side must reject the entire call. 111:mode-set=0,2,4,7 112:mode-set=0,2,4 113:mode-set=7 The question is, were the specs in good intentions, but in practicality it is mayhem of exploding nr of permutations, and maybe your MGW made a sane choice of not diving into this madness? Thanks for your feedback on this! ~N -- - 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

4 months, 2 weeks

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osmo-mgw: explicit fmtp vs. autodetection

by Neels Hofmeyr

Hi all, I have a request for comments regarding osmo-mgw, particularly the fmtp for AMR octet-align mode and the two GSM-HR variants. We are currently reviewing/writing patches to allow flexible use of fmtp in libosmo-mgcp-client. The plan is to be able to indicate which GSM-HR variant (RFC5993 or 3GPP TS 101.318) is in use. Also we are fixing the ability to indicate AMR mode (octet-align=1 vs 0) properly, per payload type nr instead of once per SDP body. Example of MGCP with SDP, showing two codecs, AMR as 112 and GSM-HR as 111, each with a fmtp as I'm discussing now: CRCX 2 7@mgw MGCP 1.0 C: 2 v=0 c=IN IP4 123.12.12.123 m=audio 5904 RTP/AVP 112 111 a=rtpmap:112 AMR/8000/1 a=fmtp:112 octet-align=1 a=rtpmap:111 GSM-HR-08/8000/1 a=fmtp:111 gsm-hr-format=3gpp-ts-101.318 a=ptime:20 That means that each MGW client tells osmo-mgw exactly what AMR and HR formats to send to the RTP peer, and also restricts exactly which format to expect from that RTP peer. So BSC and MSC need to know things about BTS and BSS, in advance: - the BSC needs configured knowledge of each BTS's octet-align and gsm-hr-format. - the MSC needs configured knowledge of what the BSC will do. - what if there are divergent formats in different BTS of a BSS, does MSC need to know that too? There is certainly no way to indicate octet-align nor HR variant in standard A interface proto. So far so complex, BUT: In practical testing, I see from logging that osmo-mgw is already quite capable of detecting which AMR octet-align mode and which HR format is actually arriving from the RTP peer (from the BTS...). I see this log line: DRTP NOTICE (rtpbridge/1@bsc0 I:FA1F785D) rx_rtp(44 bytes): Expected RTP AMR octet-aligned=1 but got octet-aligned=0. check the config of your call-agent! (mgcp_network.c:1525) And I'm thinking, where is the problem, just do what you need to do; all the information it needs to do the right thing is already available to osmo-mgw. So why even the need to configure {AMR octet-align|GSM-HR mode} in SDP? Idea: - the first RTP packet arriving is examined, and from then on the peer is known to use that format. - when later, an RTP needs to be forwarded back to that peer, we convert to the format that the peer uses, iff it is necessary. - for sanity we could hold back forwarding RTP before the details of the recipient are known, i.e. wait for each peer to send the first RTP to MGW. Example for an RTP stream in GSM-HR format: A MGW B |--HR(3gpp)-->|--x drop | (don't know B's preference yet, cannot send) | [3gpp]| | (now know A uses the 3gpp format) | |<--HR(rfc)--| | |[rfc] | (now know B uses the RFC format) | [convert] | |<--HR(3gpp)--| | |--HR(3gpp)-->|--HR(rfc)-->| |<--HR(3gpp)--|<--HR(rfc)--| There is an important difference between AMR octet-align and GSM-HR: - 'octet-align=(0|1)' is a defined standard fmtp that already exists, and it may be necessary to forward this accurately to PBX. We may not get around having to explicitly set this. - GSM-HR format is a new fmtp we are inventing now. So the idea is most relevant here: if we can always just autodetect the right thing to do, then why introduce a non-standard fmtp? (plus all the MGW client vty cfg needed) What do you think? Thanks! ~N -- - 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

4 months, 2 weeks

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Binary packages: changes in supported distributions

by Oliver Smith

Hello various Osmocom mailing lists, the official Osmocom binary packages will not be built anymore for the following distributions starting at 2024-02: * Raspberry Pi OS 64-bit (use Debian_12 etc. instead) * Ubuntu 23.04 (Ubuntu 23.10 and LTS 20.04/22.04 feeds are available) * openSUSE 15.4 (openSUSE Tumbleweed feed is available) * Debian Testing (Debian Unstable and 12-10 feeds are available) For Raspberry Pi OS 64-bit users, make sure to adjust your /etc/apt/sources.list.d as described here to switch to a Debian aarch64 feed: https://osmocom.org/projects/cellular-infrastructure/wiki/Latest_Builds See the new linux distributions article for information on how long we plan to keep building packages for each distribution: https://osmocom.org/projects/cellular-infrastructure/wiki/Linux_distributio… Let me know if you have questions. Best regards, 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

4 months, 3 weeks

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Questions on OSMOCOM & real nodes integration

by jheyrendt.ext＠orange.com

Hi We set up a full Osmocom platform, with an Ettus USRP for SDR. All works well. Congratulations to Osmocom developers ! But now we want to use "real" nodes concerning MSC, MGW, HLR, SGSN & GGSN. Do you think it is possible ? Concerning the BSC-MSC association, do we need to use an SG (osmo-stp) ? or could we establish a Point To Point BSC-MSC ? SUA ? Concerning MGW, is there a way to use our MGW ? At this time, with Osmocom corposants, we can see RTP traffic between BTS-TRX and MGW, and some MGCP traffic between (BSC - local MGW) and MGW, and some MGCP traffic between osmo-MGW and osmo-MSC. Is there a way to have a "more standard" architecture: no traffic between BTS and MGW, and MGW controlled by MSC ? Do we have to more study TRAU, AoIP ? Concerning the Gb, do you think that it 'll work if we configure the Gb on a real SGSN connected to the osmo-pcu, hosted on the osmo-bts-trx? Many thanks in advance, Best regards Jean-Marc Orange Restricted

4 months, 3 weeks

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OsmoMSC: full proper codecs negotiation

by Neels Hofmeyr

It is my pleasure to inform that I have a WIP patch for OsmoMSC that allows, for the first time, full MO<->MT codecs negotiation to flexibly achieve TFO (Transcoding-Free Operation). It would be great if OsmoMSC users could give the patch a spin (in a setup that is allowed to fail because of the patch) and see if 2G calls now adjust the MO call leg to MT's codecs limitations for you. Looking forward to feedback! This task was idling on my list because I assumed it would be a big effort, but now I realized that it is actually simple, not even a new FSM state required. So I could no longer resist to finally complete this long long quest. The result is this WIP patch: https://gerrit.osmocom.org/c/osmo-msc/+/35051 Related patch series, uncluding ttcn3 test: https://gerrit.osmocom.org/q/topic:reass This patch requires full SDP on MNCC, so if using osmo-sip-connector, it should be current master -- the relevant patch was merged but is not released yet: https://gerrit.osmocom.org/c/osmo-sip-connector/+/16222 Before this patch, MO was eternally stuck on the initially assigned codec. Now we adjust MO's codec if MT needs it. (MT already intelligently chooses codecs before this patch.) For example, if MO is AMR capable and MT is not, - the MO side will start out with assigning an AMR codec (not matching). - Once MT responds (MNCC_ALERT_REQ), the MO side notices that MT does not support the assigned codec. It sends another Assignment Command to the BSC, offering only the codecs that MT supports. - If MO has at least one matching codec (say GSM-FR), the result is a TFO call using a matching codec. We still need to check: - does OsmoBSC play along nicely with the re-assignment (it should AFAICT). - effects on MGCP: there may now be more codecs than just the assigned one in the MGCP towards the MGW. See if that checks out. - effects on 3G: make sure the feature doesn't confuse IuUP handling. The patch passes all MSC_Tests.ttcn for me (but that doesn't necessarily imply proper codecs choices, the tests are not very strict there it seems). ~N -- - 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

5 months, 1 week

2
2
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OsmoDevCall on Nov 15, 2023: Calypso history: From TI to FreeCalypso to USA PSTN

by Harald Welte

Dear Osmocom community, we're happy to announce the next incarnation of OsmoDevCall. when: (today) November 15, 2023 at 20:00 CET where: https://osmocom.org/OsmoDevCall (Big Blue Button) This time, @falconia will be presenting on Calypso chipset history and development boards, from TI to FreeCalypso This meeting will have the following schedule: 20:00 meet + greet 20:10 topic 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)

5 months, 1 week

1
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Network communication equipments for inquiry <16/10/2023 17:55>

by Yolanda from Longriseequipment

6 months, 1 week

1
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Osmo-CBC: (bts=0) Rx CBSP RESET: clearing all state; disabling broadcast

by Sipos Csaba

Dear List, I tried to set up Osmo-CBC with a Nokia MetroSite BTS according to the wiki. But every time the CBSP clinet of the BSC connects to the CBC server, the BSC log indicates: DCBS cbsp_link.c:150 CBSP Client connected to CBC: (r=127.0.0.1:48049<->l=127.0.0.1:46133) DCBS smscb.c:805 (bts=0) Rx CBSP RESET: clearing all state; disabling broadcast Same time on the CBC: <0002> cbsp_link.c:265 New CBSP link connection from 127.0.0.1:46133 <0002> cbsp_link_fsm.c:181 local-bsc: RESTART (CBS) but re-sending not implemented yet The BTS is configured with CCCH+SDCCH4+CBCH, and these are the relevant sections: osmo-cbc.cfg: cbc unknown-peers reject ecbe local-ip 127.0.0.1 local-port 12345 cbsp local-ip 127.0.0.1 local-port 48049 sbcap local-ip 127.0.0.1 local-port 29168 peer cbsp local-bsc mode server remote-port 46133 remote-ip 127.0.0.1 osmo-bsc.cfg: cbc mode client client remote-ip 127.0.0.1 local-ip 127.0.0.1 local-port 46133 Every other CS service is working fine on the BTS. Is there anything else I might have missed? Regards, Csaba

7 months

3
5
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OsmoDevCall on Sept 20, 2023: Interconnecting an Osmocom GSM network to USA PSTN

by Harald Welte

Dear Osmocom community, we're happy to announce the next incarnation of OsmoDevCall. when: September 20, 2023 at 20:00 CEST where: https://osmocom.org/OsmoDevCall (Big Blue Button) This time, @falconia will be presenting on Themyscira Wireless: a case study in interconnecting an Osmocom GSM network to USA PSTN This meeting will have the following schedule: 20:00 meet + greet 20:10 topic 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)

7 months, 1 week

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osmo-msc release?

by Neels Hofmeyr

I just noticed that a release was made, ignoring this remark in osmo-msc's TODO-RELEASE: MNCC osmo-sip-connector should do full SDP via MNCC and be released at the same time as the next osmo-msc, ask neels, thanks https://gerrit.osmocom.org/c/osmo-msc/+/34386 There is no full SDP support in current osmo-sip-connector. In fact the patch for that is just now becoming ready for merge: https://gerrit.osmocom.org/c/osmo-sip-connector/+/16222 I guess we should get the sipcon patch merged, and follow up with another sipcon release. ~N

7 months, 1 week

5
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icE1USB gateware

by Sipos Csaba

Dear list, I built an icE1USB device so I can provide stable clock to my legacy Nokia BTS. I have not found any information about how to bring up a completely empty device, so I just took the icE1usb-202210-5890f3e4.bin file and flashed it to the SPI flash, yet the device is not booting. Maybe something else is missing (like a boot block), or the binary has to be flashed with an offset? The device takes 80mA in this state, USB device is not recognized on the host. Thanks!

7 months, 1 week

2
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September 2023 Osmocom CNI releases (202302)

by Pau Espin Pedrol

Hi all, I am happy to announce that a new version 202309 of the Osmocom CNI (Cellular Network Infrastructure) software has been released this week. For further information, please visit: https://osmocom.org/news/220 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

7 months, 1 week

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Re: Libraries not found when using nightly

by Sipos Csaba

Hi Vadim, You are probably correct, in the mean time I recompiled everything, so it works now, but most likely the *-dev packages were missing. Thanks for pointing that out! Another question I have is about displaying the Osmo-BSC logs: I am working on a museum setup and would be nice to show the BSC log output on the screen when there is activity. I wonder if there is a practical way to do that without altering the systemd part. Regards, Csaba

7 months, 2 weeks

2
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Libraries not found when using nightly

by Sipos Csaba

Dear List, I face the problem that when I am in general using the nightly builds on Ubuntu 20.04, but I want to compile a specific project (Osmo-BSC in this case), the configure script is not able to find the Osmocom libraries which are already installed and available. Output of the configure script: configure: error: Package requirements (libosmocore >= 1.8.0) were not met: Package 'libosmocore', required by 'virtual:world', not found Libosmocore is available on the system: root@openbsc:~/osmo-bsc_bootstrap_mod/osmo-bsc# ldconfig -v|grep libosmocore /sbin/ldconfig.real: Can't stat /usr/local/lib/i386-linux-gnu: No such file or directory /sbin/ldconfig.real: Path `/usr/lib/i386-linux-gnu' given more than once /sbin/ldconfig.real: Can't stat /usr/local/lib/i686-linux-gnu: No such file or directory /sbin/ldconfig.real: Can't stat /lib/i686-linux-gnu: No such file or directory /sbin/ldconfig.real: Can't stat /usr/lib/i686-linux-gnu: No such file or directory /sbin/ldconfig.real: Can't stat /usr/local/lib/x86_64-linux-gnu: No such file or directory /sbin/ldconfig.real: Path `/usr/lib/x86_64-linux-gnu' given more than once /sbin/ldconfig.real: Path `/lib/x86_64-linux-gnu' given more than once /sbin/ldconfig.real: Path `/usr/lib/x86_64-linux-gnu' given more than once /sbin/ldconfig.real: Path `/usr/lib' given more than once /sbin/ldconfig.real: /lib/i386-linux-gnu/ld-2.31.so is the dynamic linker, ignoring /sbin/ldconfig.real: /lib/x86_64-linux-gnu/ld-2.31.so is the dynamic linker, ignoring libosmocore.so.20 -> libosmocore.so.20.0.0 Can someone help me with what kind of flags do I need to provide to the configure script and how? Much appreciate the help! Regards, Csaba

7 months, 2 weeks

2
1
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GPRS hardware recommendations

by Ben Huntsman

Hi all- I'm trying to get a GPRS network set up to serve a few old phones I have, but I don't really need anything beyond that. There's a daunting array of choices and scant documentation out there, so I just thought I'd ask, does anyone have any recommendations for what the least expensive hardware solution to implement GPRS would be? In particular though, I'd like to go with commercial non-SDR hardware, and I'd rather spend a tiny bit more if it would get something smaller... Are there any good GPRS-capable femtocells that work well with the Osmo stack? I'm looking at some old Ericsson gear but hoping for something more compact. Thanks in advance! -Ben

7 months, 2 weeks

3
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Can I build my own GMR satellite/base station and core network based on OpenBSC?

by 1191595017＠qq.com

Dear Osmocom community, Can I build my own GMR satellite/base station and core network based on open-source software (e.g. osmo-bts) and SDR? GMR is mentioned in the Osmo-bts user manual, but it doesn't say if it is implemented and how to configure it. If Osmo-bts doesn't work, is there any other project to build my own GMR base station and establish a connection with a GMR device? Best regards, Wei

7 months, 2 weeks

1
0
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Manually choose frequencies for osmotrx

by Enzo Damato

Hello. I am working on setting up an osmoTRX based base station. Where I am in the US, between 902 and 928 MHz is part of the ISM spectrum, and unregulated. Therefore, I would like to configure my base station to use both an uplink and down link frequency within this range. However, none of the pre-existing ARFCN options have both the uplink and downlink frequencies within this band. Is it possible to manually shift the frequency used by the base station, or manually select the up/down frequencies so that both remain within this range? Thank you for your help, Enzo Damato

8 months

6
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