OpenBSC December 2022

openbsc@lists.osmocom.org

10 participants
16 discussions

Distributed GSM
by Keith 17 Jan '23

17 Jan '23

Hi all, I was thinking about how to deal with the so called "evil twins" in the distributed hlr, and also how to have a subscriber-create-on-demand situation at the same time as a having an mslookup client. The problem being that if we have mslookup client + fallback to create-on-demand if no HLR responds for an IMSI, we will eventually create a duplicate because the HLR that owns the IMSI is not contactable at the time of an IMSI ATTACH attempt. Anyway, just in terms of investigating the situation on my HLRs, I added features [1] - so far, an ability to do a gsup.hlr lookup and not exit on the first age:0 - so that I can see all HLRs that respond as having the imsi in local HLR, and also to ask via mDNS for HLRs that have an IMSI, but only if it's active on that HLR, that is, it has nam_cs/nam_ps So this is really asking about what people feel about expanding the D-GSM features in osmo-hlr, as I think it may be the case that rhizomatica/TIC are the only people that use it? [1] https://gitlab.tic-ac.org/rhizomatica/osmo-hlr

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Soapymultisdr
by Lanea Lucy 26 Dec '22

26 Dec '22

Hi, is it possible to use soapyMultiSdr for osmo-trx? I have a hackrf one, which isn't full duplex, so my idea is to use the hackrf for tx, and something else for Rx. With soapymultisdr it is possible to use multiple devices as a single soapysdr device.

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SGSNemu performance
by Sipos Csaba 25 Dec '22

25 Dec '22

Dear Harald, Sorry to spam the openbsc list with this, but if you (or someone) can confirm if the Sgsn-emu part of Osmo-GGSN utilizing the kernel GTP module or not, that would be lovely. FYI, I was not able to pass more than 280Mbit and the sgsn-emu process was maxing out a single core. Based on this I suspect that it does not use the kernel GTP module. I have seen some commits that indicates preparation work for this feature, but it is unclear at least to me, if this was finished or not. In the Osmo-GGSN.cfg example config I can see the config option for kernel GTP, but not in the sgsn-emu.cfg example. Regards, Csaba

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Re: OpenBSC Digest, Vol 98, Issue 9
by Sipos Csaba 25 Dec '22

25 Dec '22

Hi Pau and Harald, > So sgsnemu is passing use_kernel=false, which makes the lib skip gtp-kernel functions That is nice, I can play with that part quite nicely and take a look how the GGSN handles the switch between kernel and non-kernel GTP. Thanks for that! @Harald: In gtpnl.h there is int gtp_dev_create() and int gtp_dev_create_sgsn() So it seems there is a different dev create for the SGSN mode. And in the later one the role is set to "GTP_ROLE_SGSN" int gtp_dev_create(int dest_ns, const char *gtp_ifname, int fd0, int fd1) { return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_GGSN); } EXPORT_SYMBOL(gtp_dev_create); int gtp_dev_create_sgsn(int dest_ns, const char *gtp_ifname, int fd0, int fd1) { return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_SGSN); } EXPORT_SYMBOL(gtp_dev_create_sgsn); I just need to find the relevant part is sgsn-emu to see where these parts are invoked so I can make the modifications. Regards, Csaba <openbsc-request(a)lists.osmocom.org> ezt írta (időpont: 2022. dec. 24., Szo, 13:00): > > Send OpenBSC mailing list submissions to > openbsc(a)lists.osmocom.org > > To subscribe or unsubscribe 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. Re: SGSNemu performance (Pau Espin Pedrol) > 2. Re: SGSNemu performance (Harald Welte) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 23 Dec 2022 18:38:55 +0100 > From: Pau Espin Pedrol <pespin(a)sysmocom.de> > Subject: Re: SGSNemu performance > To: Sipos Csaba <dchardware(a)gmail.com>, > "openbsc-request(a)lists.osmocom.org" <openbsc(a)lists.osmocom.org>, > laforge(a)osmocom.org > Message-ID: <782d5c68-0393-e63a-ddbd-a78ca04256e0(a)sysmocom.de> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Hi Csaba, > > > > On 12/22/22 15:00, Sipos Csaba wrote: > > Dear Harald, > > > > Sorry to spam the openbsc list with this, but if you (or someone) can > > confirm if the Sgsn-emu part of Osmo-GGSN utilizing the kernel GTP > > module or not, that would be lovely. > > sgsnemu is not using the kernel module, only osmo-ggsn has support for > it so far. > > See osmo-ggsn.git/./sgsnemu/sgsnemu.c line 1905 calling: > """ > if (tun_new((struct tun_t **)&tun, options.tun_dev_name, false, -1, -1)) > """ > > See tun_new() function used by both osmo-ggsn and sgsnemu: > """ > int tun_new(struct tun_t **tun, const char *dev_name, bool use_kernel, > int fd0, int fd1u) { > """ > > So sgsnemu is passing use_kernel=false, which makes the lib skip > gtp-kernel functions like gtp_kernel_create(). > > > > > FYI, I was not able to pass more than 280Mbit and the sgsn-emu process > > was maxing out a single core. Based on this I suspect that it does not > > use the kernel GTP module. I have seen some commits that indicates > > preparation work for this feature, but it is unclear at least to me, > > if this was finished or not. In the Osmo-GGSN.cfg example config I can > > see the config option for kernel GTP, but not in the sgsn-emu.cfg > > example. > > > > You could try passing use_kernel=true to tun_new(), and see how far you > can get. Patches welcome. > > 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 > > ------------------------------ > > Message: 2 > Date: Fri, 23 Dec 2022 18:47:57 +0100 > From: Harald Welte <laforge(a)gnumonks.org> > Subject: Re: SGSNemu performance > To: Pau Espin Pedrol <pespin(a)sysmocom.de> > Cc: Sipos Csaba <dchardware(a)gmail.com>, > "openbsc-request(a)lists.osmocom.org" <openbsc(a)lists.osmocom.org> > Message-ID: <Y6XpzZoYYdVxYKdb@nataraja> > Content-Type: text/plain; charset=us-ascii > > Hi Csaba and Pau, > > On Fri, Dec 23, 2022 at 06:38:55PM +0100, Pau Espin Pedrol wrote: > > You could try passing use_kernel=true to tun_new(), and see how far you can > > get. Patches welcome. > > The GTP kernel module needs to be told if it operates in SGSN or GGSN mode. > > grep for GTP_ROLE_SGSN in libgtpnl. I don't know all of the related functions > off my head, but on the SGSN side you need to make sure to initialize the kernel > GTP with GTP_ROLE_SGSN instead of GTP_ROLE_GGSN. > > -- > - 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) > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > OpenBSC mailing list -- openbsc(a)lists.osmocom.org > To unsubscribe send an email to openbsc-leave(a)lists.osmocom.org > > > ------------------------------ > > End of OpenBSC Digest, Vol 98, Issue 9 > **************************************

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Testing voice calls in OsmoCNI
by Vadim Yanitskiy 10 Dec '22

10 Dec '22

Hi all! Recently in the IRC I brought up a topic of testing voice calls in OsmoCNI, which then turned into a discussion. The problem is I wanted to highlight is that there is currently no *easy* way to test voice calls, especially when running a virtual OsmoRAN setup (fake_trx.py + trxcon or virtphy). == A bit of history == Back in the openbsc/osmo-nitb days I used to run jolly's LCR (Linux Call Router) [1], which was configured to play some hold melody when calling 995, and echo voice frames back when calling 999. Nowadays openbsc/osmo-nitb is obsolete and completely suppressed by the new and shiny OsmoRAN/OsmoCNI stack. The LCR is not actively maintained anymore and does not support the MNCCv8, so it cannot talk to osmo-msc. BTW, I forked it, fixed some compilation errors, created a package, and tried to implement MNCCv8 support (no luck, calls still don't work): https://gitea.osmocom.org/vyanitskiy/lcr/commits/branch/fixeria/fixes https://gitea.osmocom.org/vyanitskiy/lcr/commits/branch/fixeria/mncc https://aur.archlinux.org/packages/lcr-git Looks like it does not support late TCH assignment? [1] http://www.linux-call-router.de/ == Current situation == Currently with the new post-NITB stack I see the following options: a) run a virtual BTS, attach two mobiles, and setup a call between them; b) run a real BTS, attach two phones, and setup a call between them; c) run some PBX, talking to osmo-msc via osmo-sip-connector. Personally I find neither of these options convenient because: a) requires running two instances of the mobile app (from osmocom-bb.git). I know one can run two and even more MS instances in one mobile process, but this is still not handy. b) requires running a real BTS and interacting with real phones. This is what I usually do, but it takes more time than running everything virtually. c) requires setting up a PBX (e.g. Freeswitch, Asterisk), which in its turn requires digging into the new world of configuration files. I do have a repository with a know-to-work Freeswitch configuration [2], but installing it (even from packages) is not trivial. [2] https://people.osmocom.org/fixeria/freeswitch.cfg.zip == What do I want == It would be great to have an easy-to-use echo service, be it attached to osmo-msc via the MNCC socket, or be it built-in part of osmo-msc itself. This would be usable for both real and virtual setups. == Conclusion == I would like to know how do you guys test voice, and what do/would you consider an easy approach. I actually found out that it's possible to use osmo-msc's silent-call feature and play the Uplink RTP stream with osmo-gapk. I'll share more details in a follow up mail. In the IRC @whytek proposed to use sipp [3] and later came up with a wiki page [4] describing how to achieve this with SEMS (SIP Express Media Server). This is definitely easier than setting up Freeswitch or Asterisk, but still feels like an overkill (sorry). [3] https://sipp.sourceforge.net/doc/reference.html#RTP+echo [4] https://osmocom.org/projects/cellular-infrastructure/wiki/Simple_Echo_Server Best regards, Vadim. -- - Vadim Yanitskiy <vyanitskiy at 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

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Re: java applet loading on sysmo-isim-sja2
by Johannes Waigel 07 Dec '22

07 Dec '22

I'm also just trying to figure out how it works with global platform. The problem you have with Global Platform is that you have not specified an installation parameter. I tried it for example with "-default -params 80120100140600000000000000000000810600040200000400820600040200000400" and the applet was installed and also made selectable. You can find a discussion about that parameters here: https://github.com/martinpaljak/GlobalPlatformPro/issues/293 I'm looking now why I can't open the menu e.g. from the iPhone. Probably any access rules / directories access still need to be updated here?

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OpenBSC December 2022