OpenBSC September 2012

openbsc@lists.osmocom.org

21 participants
26 discussions

GPRS - local and foreign TLLIs
by Luca Melette 04 Feb '26

04 Feb '26

Hello everybody, after setting up a nanoBTS with OpenBSC/SGSN/GGSN, I had some troubles trying to connect my smartphone to the GPRS cell. Investigating the BTS-to-SGSN traffic, I saw that the frames sent by the SGSN were all marked with the same N(U) value (at LLC layer), the value was 0. With some debug, I found that the there was a mismatch in the TLLI storage, used to keep the status of attached terminals. The mentioned code is contained in gprs_llc.c, involving LL Entity functions and gprs_llc_tx_ui(). /* look-up or create the LL Entity for this (TLLI, SAPI) tuple */ lle = lle_by_tlli_sapi(msgb_tlli(msg), sapi); if (!lle) { struct gprs_llc_llme *llme; LOGP(DLLC, LOGL_ERROR, "LLC TX: unknown TLLI 0x%08x, " "creating LLME on the fly\n", msgb_tlli(msg)); llme = llme_alloc(msgb_tlli(msg)); lle = &llme->lle[sapi]; } The TX function uses the previously received TLLI to lookup for the LLE. The lle_by_tlli_sapi() performs the search, but preliminary it applies a foreign2local TLLI conversion to ensure to have a local one. Since no valid entry for the searched TLLI is found, a new one is created. And the problem is here. The new entry has the foreign TLLI. Next time the lookup fails again, and a new entry is created. This way, the counter N(U) is always reset, and the mobile do not recognize the message sequence and no attach is possible. My question is about foreign and local TLLIs. I patched the lookup, avoiding the conversion, so that the LLE is found and everything works fine... but... What is the sense of the conversion? Should the TLLI be always stored as a local one? Can this problem be solved with another foreign2local while allocating new entries? Actually, my problem has been solved with that workaround. But I'm curious to know what is the right way. Hope somebody can answer :) Thanks. Cheers, LM

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Re: Help with sccp library
by mosbah abdelkader 08 Jul '25

08 Jul '25

> I don't understand. This callback will be called with data you need to write > to the network. In case of MTP Level3 you will need to wrap that around the > msgb you got. I means: is the interaction with mtp3 layer implemented (is sending sccp data by mtp3 implemented by the library?)? Also, what about the reception of data from mtp3 layer. is that implemented in the sccp lib. I am asking these questions because I see the code of mtp3 in the lib but no significant call is present in the sccp part of the lib. Thank you for your help.

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Re: Any interest for Osmocom meetings in Bavaria ?
by Dieter Spaar 11 Jun '13

11 Jun '13

So far three persons have indicated their interest to join a meeting at my place. Considering the time it takes to drive to my place, it probably makes sense to have the meeting at the weekend (either Saturday or Sunday) so that there is more time for the meeting itself. I can suggest one of the following dates for the first meeting, somewhere between 10:00 to 18:00 on each day: 25.8. (Sa) or 26.8. (Su) 1.9. (Sa) or 2.9. (Su) 8.9. (Sa) or 9.9. (Su) So please let me know when you have time and also make suggestions in which Osmocom topic you are interested in so that we can have some sort of agenda for the meeting to make best use of the time. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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SimpleHLR: A web interface for OpenBSC
by Peter Caprioli 03 Jun '13

03 Jun '13

Hello everyone, I've just finnished writing together a small web interface for the OpenBSC HLR. It allows you to modify various parameters in the database and also provides a set of functions to modify the HLR or sending SMSes in your own scripts. The project is still very alpha but it seems to work reasonably good. Feel free to give any feedback! Screenshots and source code is available on my website: https://stormhub.org/simplehlr/ -- *Best regards, Peter Caprioli*

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Several questions
by jason mercury 06 Dec '12

06 Dec '12

I have some questions: 1) When I start bsc_hack bsc_init.c first establishes OML link and initializes the bts then it establishes RSL link and bts starts broadcasting. However, it takes so much time to start the bts. Instead of this I want to do the following: it establishes OML link at the beginning and only once, then when i want to start broadcasting it establishes just the RSL link and bts will start faster since i don't have to wait for OML link. What should be done for this? 2) If i send one or two word messages from telnet interface it is okay. But if i send a longer message the phone could't receive the end of the message correctly(last words may be incomplete). Did any one encounter with this problem? What is wrong with me? 3) Could I send SMS in which extension of the sender is text not integer. For example, i want to send an information SMS that this is a test network. For this purpose i want to send an SMS from 'OpenBSC'. I set the extension of the first subscriber in database as text and tried to send the SMS but SMS wasn't delivered. What should i do? 4) Can i add SMS externally to SMS table of database? Thanks. Jason

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Bounce action notification
by mailman＠lists.osmocom.org 01 Oct '12

01 Oct '12

This is a Mailman mailing list bounce action notice: List: OpenBSC Member: jledet07(a)student.aau.dk Action: Subscription disabled. Reason: Excessive or fatal bounces. The triggering bounce notice is attached below. Questions? Contact the Mailman site administrator at mailman(a)lists.osmocom.org.

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BS-11 to sell
by Harald Welte 01 Oct '12

01 Oct '12

Hi! In case anyone on this list is interested in owning a BS-11, I have decided to sell off one more of the units that I still had here for my personal use. I'm also able to sell a compatible HFC-E1 or DAHDI/Digium card along with it. Price is up to negotiation. I don't intend to give it away for free, unless it is somebody with a known track record of osmocom.org contributions. Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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Help needed with CSD/V.110 decoding
by Tobias Engel 28 Sep '12

28 Sep '12

Hi, I have been trying to implement some basic CSD functionality into openbsc. V.110 transparent mode, to be specific, since this should be the most simple to implement. At first I tried with a nanobts, but that didn't seem to work at all. Now I am using a bs-11. The two phones I use establish a connection, but they cannot exchange data and what I see on the Abis link also doesn't really make sense to me. (Needless to say everything works as expected when using the same phones on a production network.) I attached a pcap of a CSD call I made via the bs-11. The second attachment is the raw dump of the traffic frames I received from the BS-11 for _one_ of the phones. (It looks pretty much the same for the other phone.) The first idle data frames received look ok: 00000000 00 00 c5 ff ff ff ff ff fd ff ff ff ff ff ff ff 00000010 ff fd ff ff ff ff ff ff ff ff fd ff ff ff ff ff 00000020 ff ff ff fd ff ff ff ff C bits (Uplink data), D bits (all set to "1" == idle) and E bits (9.6 kbit/s) are all set as expected. But after the synchronisation phase, things start to get strange. The idle frames suddenly look like this: 00000460 00 00 8a ff ff fe fe fe fa fe fe fe fe fe fe fe 00000470 fe fa ff fe fe fe fe fe fe fe fa ff fe fe fe fe 00000480 fe fe fe fa ff fe fe fe The BTS "forgets" to set the first bit of every octet to "1" on most (but not all) octets. Also, the C bits now state that this is a 14.5kbit/s data frame. The E bits say the user rate now is 7.2 kbit/s. There are only four frames with actual payload data in the dump. These frames are at the positions I expect them to be (40600, 60520, 80440, 100400 - they were sent in intervals of 10 seconds). They look like this: 00009e90 00 00 8a ff 2b a2 fa aa 00009ea0 fa 86 02 22 22 6e fe 1a 26 fa d7 4e d6 52 36 56 00009eb0 4e d6 fa 53 36 56 4e d6 52 36 56 fa 4f d6 52 36 What has been sent by the phone is an eight byte timestamp followed by 22 bytes of 0xaa. But I only get one data frame for each of these transmissions (30 bytes of payload don't fit into one data frame), and if I parse it as V.110 data, I get these 20 bytes: 00000000 15 7d 0d 10 d5 ff 33 fb ae f5 ff ae ba ef fd ba 00000010 ef ae ba ff So no 0xaa bytes there... Does anybody have any idea what I might be doing wrong here? Thanks, -Tobias

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OpenBSC unsubscribe notification
by mailman-bounces＠lists.osmocom.org 26 Sep '12

26 Sep '12

akwonghk(a)gmail.com has been removed from OpenBSC.

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Re: OpenBSC Digest, Vol 45, Issue 15
by TAUFIQ WAHYUDI 25 Sep '12

25 Sep '12

@peter i have already installed libosmocore,libosmo-aabis,and openBsc,and have been clone and integrated all the items into eclipse via egit. i am a newbie in telco, does anyone in this forum know how to start up openBSC ? i do want to know how does the Box work, and really confuse how to start from.Would you guys send me a technical startup document globally, so then i have an understanding regarding this stuff Best Regards On 9/24/12, openbsc-request(a)lists.osmocom.org <openbsc-request(a)lists.osmocom.org> wrote: > Send OpenBSC mailing list submissions to > openbsc(a)lists.osmocom.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.osmocom.org/mailman/listinfo/openbsc > or, via email, send a message with subject or body 'help' to > openbsc-request(a)lists.osmocom.org > > You can reach the person managing the list at > openbsc-owner(a)lists.osmocom.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of OpenBSC digest..." > > > Today's Topics: > > 1. new comer (TAUFIQ WAHYUDI) > 2. Re: new comer (Peter Stuge) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 23 Sep 2012 21:36:30 -0700 > From: TAUFIQ WAHYUDI <taufiq.wahyudi.12(a)gmail.com> > To: openbsc(a)lists.osmocom.org > Subject: new comer > Message-ID: > <CACxKs184Ma=PeW5sPi=HWWJm6xb+sqywmHBEgMs+XKKqiXEy+g(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > hi all, > > i am new comer in this group, i already have installed openbsc until to > this step, i have problems would you mind all giving me a hand in the > future? > > thank you very much > > Best Regards >

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OpenBSC September 2012