OpenBSC April 2018

openbsc@lists.osmocom.org

15 participants
29 discussions

Re: Service Category Information Element
by Vadim Yanitskiy 14 Apr '18

14 Apr '18

Hi, > get Service Category Information Element for a call > (description in TS 124 008 V13.7.0 10.5.4.33) According to the mentioned specification, this IE is an optional part of SETUP message. So, your assumption: > it is somewhere within gsm_04_08.c is correct. Have a look at the gsm48_cc_rx_setup(): > /* emergency setup is identified by msg_type */ > if (msg_type == GSM48_MT_CC_EMERG_SETUP) Emergency calls are also handled there. The following IEs are handled: > if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_SUPP)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_INVOC)) ... > if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) ... So, you need to implement checking for the Service Category IE yourself. It has 0x2e tag, and doesn't seem to be supported by libosmocore. You would also need to implement parsing of the payload yourself. Contributions are welcome ;) With best regards, Vadim Yanitskiy.

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Service Category Information Element
by Теч Мобил 12 Apr '18

12 Apr '18

Dear all, At the moment we are doing some development works on the basis of ‘Osmocom/OpenBTS’ project. May you kindly advise if it is possible to get Service Category Information Element for a call (description in TS 124 008 V13.7.0 10.5.4.33)? If it is possible could you please tell what variable or function to search? As far as we get it, it is somewhere within gsm_04_08.c Thank you very much in advance.

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[OPENBSC] IP.ACCESS nano3G Model # 239C
by Choukoumoun 12 Apr '18

12 Apr '18

Hello, The IP.ACCESS nano3G Model # 239C is compatible with openbsc 2G or osmocom 3g APPS ? Thank you.

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Siemens BS11 for local pickup in Berlin
by Philipp Maier 11 Apr '18

11 Apr '18

Hello Folks, I managed to get something smaller to perform the experiments I occasionally do. Because of this, I want to pass on my BS11 to someone else. I am giving away the equipment for free. However I have an interest in giving it to someone who has an honest interest in in GSM/osmocom topics. I think the BS11 is suitable for beginners as it is very well documented in the wiki and there are many people out there who have some experience with this type of equipment. The BS11 comes ready to use with a somewhat outdated osmo-nitb installation on a small PC that also houses the E1 card. So in theory one just needs to switch it on and the GSM network is ready to use. However, there will be some work required to install a recent OS/osmo-nitb to catch up with the current state. The BS11 is located in the north of Berlin and has to be picked up by someone locally. If you are interested, please get in contact with me. Here are some pictures of the equipment: http://pub.runningserver.com/pics/bs11/ best regards, Philipp Maier

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How to find IMSI for OsmoHLR
by Michael Spahn 09 Apr '18

09 Apr '18

Hi, I am currently having some problems in adding new subscribers to OsmoHLR, particularly, in finding the IMSI of the devices. From what I gathered from the wiki, the OsmoHLR log is supposed to show the IMSI of any mobile stations trying to connect to my network without being subscribers. However, the log does not show any indication of that whatsoever. I had previously imported an old database from our previous OsmoNITB setup and all devices that had been added as subscribers with SimpleHLR back then were able to connect to the new setup flawlessly, but now I have decided to delete an MS from the database to learn how to add new subscribers but like I’ve said before, I am not able to find the IMSI in any log. These are the logging settings in my OsmoHLR config: log stderr logging filter all 1 logging color 1 logging print category 1 logging timestamp 1 logging print extended-timestamp 1 logging level all debug logging level linp error I’d really appreciate if someone could help me out here. Kind regards, Michael Spahn

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SS7 on osmocom-3G
by Radiarisainana Sitraka 06 Apr '18

06 Apr '18

My quesitonn is , with the osmocom-3G and the box nanocell3G for example; it is possible to send ss7 message like sri-for-sm, ...!? Chears,

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Bug #1617 CBCH implementation for osmo-bts-trx
by Antony Lemmens 06 Apr '18

06 Apr '18

Hello, I'm currently working on a proof of concept for a foreign customer. We have a Fairwaves UmTRX board and we would like to send Cell Broadcast message (SMS-CB). I have a full working osmocom chain (trx, bts-trx, bsc, stp, msc, hlr) that woks fine for SMS sending by example. I have made a fix in rsl.c because all SMSCB commands where rejected (see at bottom of this message). I have dig into the code and found the place where the SMS CB are queued (rsl.c : bts_process_smscb_cmd) and the code to extract them as MAC blocks (rsl.c : bts_cbch_get). I have also found the handler of the scheduler (scheduler_trx.c : tx_data_fn) where to put the block data. I have read articles about the superframe mechanism but I do not figure out how to advertise the CBCH functionality on the BCCH, nor how to adapt the scheduler to enable the CB channel. Is it someone also interrested in this and/or working on the Bug 1617? Or is it someone that can me give a track to start the implementation? Have a nice day, Antony ----------------------------------------------------------------------------------------------------------- Fix in rsl.c : ----------------------------------------------------------------------------------------------------------- replaced : if (chan_nr_is_dchan(cch->chan_nr)) return rsl_reject_unknown_lchan(msg); msg->lchan = lchan_lookup(trx, cch->chan_nr, "RSL rx CCHAN: "); if (!msg->lchan) { LOGP(DRSL, LOGL_ERROR, "Rx RSL %s for unknown lchan\n", rsl_msg_name(cch->c.msg_type)); return rsl_reject_unknown_lchan(msg); } ----------------------------------------------------------------------------------------------------------- by: if (chan_nr_is_dchan(cch->chan_nr)) { printf("Message NOT for DCHAN\n"); //return rsl_reject_unknown_lchan(msg); } else { printf("Message for DCHAN\n"); // Only check channel validity if it is a dedicated channel call. msg->lchan = lchan_lookup(trx, cch->chan_nr, "RSL rx CCHAN: "); if (!msg->lchan) { LOGP(DRSL, LOGL_ERROR, "Rx RSL %s for unknown lchan\n", rsl_msg_name(cch->c.msg_type)); return rsl_reject_unknown_lchan(msg); } }

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log rotation in libosmocore?
by Neels Hofmeyr 04 Apr '18

04 Apr '18

I client of ours has the desire to merge a patch to libosmocore that adds simplistic log rotation functionality. Our first response was against it: we have the SIGHUP handling that allows logrotate to tell osmocom programs to re-open their log file(s). However, the system in question is based on BusyBox, which lacks logrotate. I haven't yet investigated why it can't just be installed, but there seems to be some or other issue about that. The next best idea is to cook up a shell script that does more or less what logrotate does ... and probably run into problems that logrotate already solves better. The script needs to clean old files and invoke SIGHUP... So I'd like to ask around, maybe it is acceptable to merge a poor-man's log rotation functionality to libosmocore after all? The patch needs some improvements (VTY configurability for starters), but so far goes something like this: static void _file_output(struct log_target *target, unsigned int level, const char *log) { - fprintf(target->tgt_file.out, "%s", log); - fflush(target->tgt_file.out); + int n; + + if (target->tgt_file.out) { + + n = fprintf(target->tgt_file.out, "%s", log); + fflush(target->tgt_file.out); +#ifdef stderr + /* don't try try to roll stderr */ + if (target->tgt_file.out != stderr) +#endif + { + if (n > 0) { + target->tgt_file.written_count += n; + + if (target->tgt_file.roll_count != 0 && + target->tgt_file.written_count > target->tgt_file.roll_count) { + + /* Create filename */ + char rotname[strlen(target->tgt_file.fname) + 3]; + + strcpy(rotname, target->tgt_file.fname); + strcat(rotname, ".1"); + + /* Rename the current log, then reopen the log to start new file */ + rename(target->tgt_file.fname, rotname); + log_target_file_reopen(target); + } + } + } + } } Note, this follows a simplistic approach to removing old log files: there is always exactly one rotated-away file, 'mylogfile.1', which gets overwritten in each rotation. Any rotation features more elaborate than this should better be solved with logrotate, but would everyone accept this kind of patch merged to libosmocore? Thanks, ~N

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Missing dependency libosmo-mgcp0 when installing osmo-mgw
by Bruckner Jan (ETAS-SEC/ECT-Mu) 04 Apr '18

04 Apr '18

Hi all, When trying to install the osmo-mgw package from the Latest repository, the package cannot be installed because the dependency libosmo-mgcp0 is not found. The message is: "osmo-mgw : Depends: libosmo-mgcp0 but it is not installable" I'm using the Debian 9 repository and my OS is Debian 9.4. Looking into the dependencies, I see that osmo-mgw depends on both libosmo-mgcp0 and libosmo-mgcp1. Are both of these actually necessary or should the libosmo-mgcp0 dependency be removed? Installing the libosmo-legacy-mgcp0 package does not help either. Thanks, Jan

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OpenBSC April 2018