OpenBSC April 2024

openbsc@lists.osmocom.org

11 participants
20 discussions

E1 to IP with iCE40 E1 USB interface
by Alina Androne 15 Jun '24

15 Jun '24

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

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Question about connecting OSMO-MSC to MME from Open5Gs
by Hennig, Lilly 18 May '24

18 May '24

Hello everybody, I was trying to setup an OSMO-MSC with an Open5Gs-Corenetwork, so I can send SMS to different UEs. Unfortunately the OSMO-MSC does not connect to the MME of the Open5Gs-Core and I do not find any installation guide for this specific setup. For your information: The Open5Gs-Core runs on a Laptop and I build the Software from source (4G and 5G components). The MSC should run on the same Laptop. Therefore I would like to ask you, if you can tell me, which other components besides of the OSMO-MSC I possibly have to install and how I should configure this components and the components of the core. Many thanks in advance! Best regards Lilly Hennig

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Is anyone using the official Osmocom rpm repositories?
by Oliver Smith 10 May '24

10 May '24

Dear mailing list, as announced in https://osmocom.org/news/246, the rpm packages for CentOS 8 / AlmaLinux 8 are unmaintained. sysmocom is currently still ensuring that the rpm binary packages build from the rpm spec files we have in our git repositories. But this is also significant effort that we would rather spend elsewhere, and so we are considering to stop providing rpm builds altogether and possibly removing these spec files from our git repositories. This affects the official Osmocom binary package repositories (nightly and latest) for CentOS 8/AlmaLinux 8 and openSUSE Tumbleweed. Stable versions of Osmocom programs are also in openSUSE's official repositories and can be installed from there. So, is anyone using the official Osmocom rpm repositories? As OsmoDevCon is coming up this weekend, we can also discuss it there, feel free to talk to me about it. Best regards, 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

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GSMTAP new version (3?)
by Mauro Levra 06 May '24

06 May '24

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

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error in libosmosccp
by Sandeep Kumar 30 Apr '24

30 Apr '24

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

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New Themyscira specifications for enhanced RTP transport in GSM RAN
by Mychaela Falconia 30 Apr '24

30 Apr '24

Dear Osmocom community, About a year ago I published this specification: https://www.freecalypso.org/specs/tw-ts-001-v010001.txt TW-TS-001 is a spec, written in 3GPP language style, for enhanced RTP transport of FR and EFR codec frames in an IP-based GSM RAN. I got OsmoBTS support for this RTP extension on branch falconia/rtp_traulike, but I never submitted it to Gerrit for mainlining: when I mentioned it in OsmoDevCall in 2023-06, the feedback from Harald was that the extension would need to be somehow requested from the CN via signaling, rather than manually switched on via OsmoBTS local vty. Since then I have familiarized myself with 3GPP specs for AoIP user place (TS 48.103 and TS 26.102 it refers to), and I see the problem with my initial "brute force" method: when 3GPP specs explicitly call for standard RTP formats at the AoIP interface, intentional deviations from that standard need to be negotiated/signaled in some clean manner. So here is my new solution: https://www.freecalypso.org/specs/tw-ts-001-v010100.txt https://www.freecalypso.org/specs/tw-ts-002-v010100.txt https://www.freecalypso.org/specs/tw-ts-003-v010001.txt There are 3 new specs in the above set: * The new version of TW-TS-001 clarifies some deficiencies in the original, and refers to TW-TS-003 for how the enhanced RTP format is to be invoked at the AoIP interface. * TW-TS-002 is a new spec that does for HRv1 codec what TW-TS-001 does for FRv1 and EFR. The enhanced RTP payload format here is an extension of RFC 5993, which I named super-5993. * TW-TS-003 is an extension to BSSMAP for communicating the use of enhanced RTP payload formats between MSC and BSS. I will now be preparing some patches for TW-TS-003 support - see you in Gerrit code review soon. :-) With love and greetings from Themyscira, Mother Mychaela

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Looking for captures of TRAU-UL frame stream from E1 BTS
by Mychaela Falconia 28 Apr '24

28 Apr '24

Hello Osmocom community, Would anyone here happen to have a capture of a TRAU-UL frame stream from some historical E1 (or T1) BTS? And if no already existing UL capture is available, if I found someone with access to such equipment who would be willing to do a few tests for me, what would be the way to make such capture? I mean raw Abis UL capture, *not* converted to RTP or anything else, and because I don't have any T1/E1 hardware currently, I am not really familiar with Osmocom tools for working with such hw and what tap/trace/capture mechanisms are available. And yes, I see on the wiki page for OsmoDevCon that some E1 BTS hw will be present at the event - but my lack of an updated travel document from USCIS still precludes me from traveling anywhere outside of USA+Canada+Mexico territory. :( M~

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OsmoDevCon talk: Your favorite Osmocom related productivity tips and tools
by Oliver Smith 22 Apr '24

22 Apr '24

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

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osmo-bsc, mgw and AoIP Transport Layer Address
by jheyrendt.ext＠orange.com 18 Apr '24

18 Apr '24

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

1 0

Channel Requests not being responded when running CS-only 2G network
by JPichel 07 Apr '24

07 Apr '24

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.

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OpenBSC April 2024