OpenBSC

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4217 discussions

Can I build my own GMR satellite/base station and core network based on OpenBSC?
by 1191595017＠qq.com 07 Sep '23

07 Sep '23

Dear Osmocom community, Can I build my own GMR satellite/base station and core network based on open-source software (e.g. osmo-bts) and SDR? GMR is mentioned in the Osmo-bts user manual, but it doesn't say if it is implemented and how to configure it. If Osmo-bts doesn't work, is there any other project to build my own GMR base station and establish a connection with a GMR device? Best regards, Wei

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Manually choose frequencies for osmotrx
by Enzo Damato 27 Aug '23

27 Aug '23

Hello. I am working on setting up an osmoTRX based base station. Where I am in the US, between 902 and 928 MHz is part of the ISM spectrum, and unregulated. Therefore, I would like to configure my base station to use both an uplink and down link frequency within this range. However, none of the pre-existing ARFCN options have both the uplink and downlink frequencies within this band. Is it possible to manually shift the frequency used by the base station, or manually select the up/down frequencies so that both remain within this range? Thank you for your help, Enzo Damato

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Manually choose frequencies for osmotrx
by edamato＠ctc.sh 25 Aug '23

25 Aug '23

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Re: Welcome SMS for on-demand subscribers
by Sipos Csaba 14 Aug '23

14 Aug '23

Hi Keith, > Is it an artwork by any chance? We are saving a Nokia UltraSite and building an as fully functional GSM network as much as it is possible. We have a bit of a LAPD issue on the multi-TRX side of things as the current RSL bootstrap code is really only practical for the InSite units, so that needs some work, but at least the OM data we send is confirmed to be correct, and I can make a single TRX work. One other thing would be nice to have is Cell Broadcast, that part also does not work yet, but lets keep that issue separated. Your second link requires a gitlab login. Is there a more accessible way to get that patch? :-) Thanks! Regards, Csaba

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Welcome SMS for on-demand subscribers
by Sipos Csaba 11 Aug '23

11 Aug '23

Dear List, In the good old NITB days, it was possible to set up an "open" network where a foreign IMSI was able to register with the network, and at the first attempt the subscriber received sort of a "welcome" SMS with its random generated MSISDN. I found the on-demand option in the HLR, but I am not sure if the welcome SMS part is even possible since the network elements are now separated, no sign of it in any of the manuals though. I am working on a museum setup where there will be some pre-programmed SIMs in handsets, but it would be nice if the visitors themselves can use their own phone to connect and use the network. Worst case they can use the USSD command to get their MSISDN, but a welcome SMS would be nice to have. Regards, Csaba

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Re: OpenBSC Digest, Vol 105, Issue 5
by Sipos Csaba 08 Aug '23

08 Aug '23

Hi Keith, My question was targeting the Osmocom stack and not the (external) PBX. I already found some AMR patches for Asterisk (it seems it is still not part of mainline), will try to do that. The second half of my question was somewhat vaguely tries to ask if it is possible to do AMR when the call is MO-MT directly, or maybe the MGW can do transcoding, so in a nutshell: maybe there is a solution to do GSM FR when the call is outbound from the mobile network and AMR when it is mobile to mobile. Or the transcoding path is also an option. Point is: about these capabilities there is very little information available about what is supported and what is not within the Osmocom domain. Regards, Csaba

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SMSC address terminology
by Mychaela Falconia 08 Aug '23

08 Aug '23

Hello fellow developers, I am getting ready to implement my own SMSC, connecting to Osmocom CN via GSUP (see OS#6135), and I have a question about SMSC address terminology. In traditional commercial GSM networks, the SMSC address visible to the user (prepended to the TPDU for MT SMs, stored in EF_SMSP record on the SIM for MO SMs) looks like a phone number in full international format, with TON=1 and NPI=1. For example, T-Mobile's SMSC address is +12063130004 (to an uninitiated eye it looks exactly like a regular phone number in Seattle, WA), while the SMSC of Mexican Telcel is +5294100001410 - one digit longer than regular phone numbers in Mexico, and a little irregular in structure. What is the correct term for these SC-address phone-number-thingies? Are they Global Titles - or is GT something different? If I were to make up fake global-looking SMSC addresses of this form, e.g., something like +1xxx55501xx for NANP territory, would it be correct to call such SC-address a fake Global Title? Just wondering... M~

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EFR and/or AMR codec with Osmo-BSC/SIP-connector/Asterisk
by Sipos Csaba 07 Aug '23

07 Aug '23

Dear list, I managed to set up my E1 based Nokia BTS, the complete Osmo-CNI stack, SIP-connector and Asterisk. MO/MT calls do work as well as external SIP calls to and from mobile as well. But no matter what I do only plain FullRate calls are possible. Under osmo-bsc.conf code support is set like this (the BTS HW do support all of these codecs): codec-support fr efr amr but once I also add "codec-list fr3 fr2 fr1" to the MSC section of the osmo-bsc.conf, the calls wont establish anymore. I watched Neel's OsmoDevCall presentation on this topic, but it is not very clear what codecs are supported when osmo-sip-connector and an external PBX is used? Regards, Csaba

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OsmoBTS project
by catalinaelena119＠yahoo.com 07 Aug '23

07 Aug '23

I have git-cloned https://gitea.osmocom.org/cellular-infrastructure/osmo-bts this project in order to have a solution for calling 2 mobile phones in my own network. I dont have any experience with this. I have instaled and configured in the past the same solution from PenHerts git but it is a lil bit old. I want to configure and install this solution bu i do not know the exact steps to do that. I dont find any configuration file or i do not know what to do with them. I do not have any experince with this domain and i want to know the steps in order to run this project properly. Could you help me with any directions?

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Deprecating support for big endian in Osmocom
by Harald Welte 31 Jul '23

31 Jul '23

Hi all, during recent patch review (https://gerrit.osmocom.org/c/osmo-trx/+/33737) the topic of continuing to maintain support for big endian machines has come up. While traditionally I've always been a strong proponent of writing portable code that can run also on big endian systems, it is not the year 2003 or 2008 anymore, and PowerPC (the main big endian platform) is dead by now, as is SPARC. Not just in newly-built processors, but also in existing and still operating machines, at least of the class that would run our code. So unless somebody objects with strong arguments, I'd propose to officially and explicitly drop supporting big endian systems from osmocom CNI projects. From what I can tell, this would primarily mean * drop the struct_endianness check from the commit verification * removing all our struct_endianness-generated or other code that explicitly adds big endian support * adding some kind of #warning or even #error to a common libosmocore header file if anyone tries to build on big endian This obviously doesn't mean we can abandon using [osmo_]{htonl,ntohl}, as network byte order is still network byte order. Regards, Harald -- - 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)

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