OpenBSC

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4318 discussions

Splitting out M3UA and MTP3 out of Open BSC
by max1987martin＠outlook.com 18 Aug '26

18 Aug '26

The HLR we were targeting only supported a SCTP/M3UA/SCCP/TCAP/MAP stack, so we couldn't use SUA. Ripping the M3UA/MTP3 code out of OpenBSC worked surprisingly well. We ended up running the event loop in a separate thread to work around the threading issues. Unfortunately the HLR implements the ANSI variant of everything, whereas OpenBSC and supporting libraries seem to have been written to be compatible with the ITU standards.

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OsmoBSC - lchan allocation failed in state WAIT_RLL_RTP_ESTABLISH
by cristi.live＠yahoo.com 17 Jun '26

17 Jun '26

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OsmoBSC - lchan allocation failed in state WAIT_RLL_RTP_ESTABLISH
by Ionut Cristian CIOC 14 Jun '26

14 Jun '26

Hello guys, I found an interesting issue. After I place a call to a number which is not existent in HLR DB I am not able to make a call to an existing one anymore. Seems the timeslot is not released properly. If I am doing a BSC config adjustment like channel allocator mode assignment to descending (assuming it was ascending before) I am able to make a call again (until i call a wrong number and the lchan gets stucked). The error looks like: <000f> lchan_select.c:454 lchan(0-0-1-TCH_F-0)[0x55babd2a89c0]{UNUSED}: (type=TCH_F) Selected <0011> assignment_fsm.c:709 assignment(msc0-conn79_subscr-IMSI- xxxxxxxxxxxxxxxx-TMSI-0x63d29a26_0-0-1-TCH_F- 0)[0x55babd2a69a0]{WAIT_LCHAN_ACTIVE}: (bts=0,trx=0,ts=1,ss=0) Starting Assignment: chan_mode=SPEECH_V1, chan_type=FR, aoip=yes MSC- rtp=127.0.0.1:4382 (osmux=no) <000f> lchan_fsm.c:838 lchan(0-0-1-TCH_F- 0)[0x55babd2a89c0]{WAIT_TS_READY}: (type=TCH_F) Activation requested: ACTIVATE_FOR_ASSIGNMENT rtp=yes MGW-ci=new type=TCH_F tch- mode=SPEECH_V1 encr-alg=A5/0 ck=none <000f> lchan_fsm.c:1027 lchan(0-0-1-TCH_F- 0)[0x55babd2a89c0]{WAIT_ACTIV_ACK}: (type=TCH_F) Rx Activ ACK SPEECH_V1 <000f> lchan_rtp_fsm.c:369 lchan(0-0-1-TCH_F- 0)[0x55babd2a89c0]{WAIT_RLL_RTP_ESTABLISH}: (type=TCH_F) lchan-rtp failure in state WAIT_IPACC_CRCX_ACK: Received NACK on IPACC CRCX <000f> lchan_fsm.c:1147 lchan(0-0-1-TCH_F- 0)[0x55babd2a89c0]{WAIT_RLL_RTP_ESTABLISH}: (type=TCH_F) lchan allocation failed in state WAIT_RLL_RTP_ESTABLISH: Failed to setup RTP stream: LCHAN_EV_RTP_ERROR in state WAIT_RLL_RTP_ESTABLISH <000f> lchan_fsm.c:160 lchan(0-0-1-TCH_F- 0)[0x55babd2a89c0]{WAIT_RLL_RTP_ESTABLISH}: (type=TCH_F) Signalling Assignment FSM of error (lchan allocation failed in state WAIT_RLL_RTP_ESTABLISH: Failed to setup RTP stream: LCHAN_EV_RTP_ERROR in state WAIT_RLL_RTP_ESTABLISH) <0011> assignment_fsm.c:1043 assignment(msc0-conn79_subscr-IMSI- xxxxxxxxxxxxxxxx-TMSI-0x63d29a26_0-0-1-TCH_F- 0)[0x55babd2a69a0]{WAIT_RR_ASS_COMPLETE}: (bts=0,trx=0,ts=1,ss=0) Assignment failed in state WAIT_RR_ASS_COMPLETE, cause RADIO INTERFACE MESSAGE FAILURE: Failed to activate lchan (bts=0,trx=0,ts=1,ss=0) <0007> osmo_bsc_sigtran.c:624 (msc=0) Tx MSC: BSSMAP: ASSIGNMENT FAIL Im using an ipaccess nanoBTS (fw version 168d502_v206b17d0) as hardware and latest versions of Osmocom packages (BSC, MSC, HLR, MGW and STP) with minimal changes of example configuration (from /etc/osmocom). Do you have any idea if could be an issue related to nanoBTS firmware? Regards, Cristian

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E1 to IP with iCE40 E1 USB interface
by Alina Androne 28 May '26

28 May '26

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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GSM Silent call
by samir 04 May '26

04 May '26

Hi, I have read that silent-calls in GSM can be used to make a call to a target MS and listen to it without having the target knowing it. Is this theoretically possible ? If yes, can it be done in OpenBSC ?

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Cinema apk
by jw8920621＠gmail.com 03 May '26

03 May '26

Cinema APK (Cinema HD APK) is a popular streaming app offering free access to movies and TV shows in HD quality, with subtitles, offline downloads, and an easy-to-use interface for Android users worldwide. Cinema apk | streameast

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Reliable Economics Assignment Help Online Service for Students
by Lori Porter 02 May '26

02 May '26

Finding a Reliable Economics Assignment Help Online Service for Students at https://economicsassignmentshelp.com ensures that every academic task is built from scratch. This platform avoids recycled templates, focusing on a fresh architectural design to guarantee 100% originality. Experts develop unique logic for each economic theory, providing a distinct narrative that stays authentic. By prioritizing high-quality, custom research, the service delivers sharp and professional results that are never repeated, helping students achieve their goals with complete confidence.

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cmd2 update causing pySim-shell to fail
by bryan coxwell 02 May '26

02 May '26

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

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Discovering Eaglercraft: A Unique Way to Play Minecraft in Your Browser
by adjacent.weasel.vpym＠hidingmail.net 01 May '26

01 May '26

If you’ve ever wanted to play a classic game without downloads, installations, or high-end hardware, you might be pleasantly surprised by a browser-based experience that feels surprisingly familiar. I recently came across a project called Eaglercraft, which recreates the essence of Minecraft directly in your web browser. It’s not an official release, but rather a community-driven effort to keep older versions of the game accessible and lightweight. Here’s how you can get started, what to expect, and a few tips to make the most of it. https://eaglercraftweb.com/ Getting Started: What Is Eaglercraft? At its core, Eaglercraft is a singleplayer and multiplayer Minecraft clone that runs entirely in your browser using JavaScript and WebGL. You don’t need to install Java, download launchers, or worry about system compatibility. Simply open your browser, navigate to Eaglercraft, and you’re ready to go. The game is based on an older version of Minecraft (around 1.5.2), so it won’t have the latest features like elytras or aquatic updates, but it retains the charm of early survival gameplay. The interface is straightforward: when you load the page, you’ll see options for singleplayer worlds, multiplayer servers, and settings. Singleplayer worlds are generated procedurally, just like in the original game, so you can jump into survival or creative mode immediately. Gameplay: What Works and What Doesn’t Playing Eaglercraft feels surprisingly smooth for a browser game. You move with WASD, use your mouse to look around, and left-click to break blocks. The crafting system is the classic 2x2 and 3x3 grid, so you’ll need to remember basic recipes if you want to build tools, furnaces, or shelter. Lighting and mob behavior are also well replicated—creepers still hiss, skeletons still shoot arrows, and zombies still burn in daylight. That said, there are a few differences. The rendering is slightly less polished than the official game, and you may notice occasional glitches with block transparency or mob pathfinding. Also, because it runs in a browser, performance depends on your browser and internet speed. Chrome or Firefox usually work best. If you’re playing multiplayer, you’ll need to find a server address that supports Eaglercraft clients—many communities list public servers on forums or Discord groups. Tips for a Better Experience Use a modern browser: For the smoothest performance, stick with Chrome, Edge, or Firefox. Safari and older browsers may struggle with WebGL rendering. Adjust your view distance: In the settings menu, lower the render distance if you experience lag. A shorter view distance can make the game run much more smoothly, especially on older computers. Play with friends: Multiplayer is where Eaglercraft really shines. You can join public servers or set up a private one using tools like “EaglercraftX” or “EaglercraftBungee.” This allows you to collaborate on builds or explore with others. Save your worlds: Singleplayer worlds are stored in your browser’s local storage. If you clear your cache, you’ll lose your progress. To back up your world, look for the “Export World” option in the menu and save the file to your computer. Explore creative mode: If survival feels too tough, switch to creative mode via the settings. You’ll be able to fly, access unlimited blocks, and build without worrying about health or hunger. A Final Word Eaglercraft isn’t trying to replace the official Minecraft, and it certainly has its quirks. But for anyone who wants a quick, free, and low-commitment way to mine, craft, and build, it’s a delightful throwback. Whether you’re revisiting old memories or trying the game for the first time, this browser version offers a surprisingly solid experience. Just remember to back up your worlds, play with friends when you can, and enjoy the nostalgia of a simpler blocky world.

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Re: AMR on E1 BTS with tw-e1abis-mgw
by Sipos Csaba 30 Apr '26

30 Apr '26

Hi Mychaela, The AMR capability works great with your drop-in MGW implementation, voice quality improved a lot. I also tested the FR/EFR part earlier, which also works as expected. CSD is definitely interesting, once I have at least two CSD capable devices, I will give that a try as well. We already tried with a Nokia MetroSite, and early next year I am planning to try with our UltraSite setup at the museum as well. Would be nice to be able to send fax on top of GSM :-) The OML dialect we have in Osmocom now (called "nokia_site") despite its name it supports old Nokia equipment up to Felxi EDGE, Multiradio and Multiradio10 (on E1), if anyone else is interested, so OML support is not limited to just the Nokia *Site family. Some of this stuff is still running in less fortunate countries... Little bit of tweaking will likely needed, but at least it is not a completely unknown part like AoIP. Regards, Csaba

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