Hello,
I am sorry, this might not be the right place to ask. I am kind of a
newbie to the osmocom stack as well, so please be gentle with me.
I recently got an FCC license in the 900MHz range and I am running
sysmobts 1002 at home. I have updated it from NITB to the modern world
of course.
Everything seems to work as it should but there is one issue:
A Pixel 9 Pro Android phone with a sysmocom SIM card (999/70) connected
to the sysmobts disassociates -in certain cases- with the BTS/BSC after
a call and displays "No network". It will never reassociate again,
unless I put the phone in airplane mode and back on. Then it
reassociates immediately again.
I cannot see anything particular in the osmo-bsc/osmo-bts-sysmo logs but
as I said, I am a newbie. I will be happy to post the logs if this is
helpful.
The issue does not arise for each call, only certain calls. I use
osmo-sip-connector to an asterisk.
Is this a known issue? Is it an issue with the phone? Did I configure
something in a wrong way?
I will do some experiments with another GSM phone.
Thank you!
Christoph Lauter
Hi,
a couple month ago I proposed to make the VLR code of the osmo-msc independent of the osmo-msc
and create a new library called libosmo-vlr. Later use the libosmo-vlr code to integrate it into
osmo-sgsn.
But after take more time of this approach, I'm not sure if it is a very good idea to guarantee
high stability of libosmo-vlr as we do for other osmocom libraries.
Because the code is heavily integrated with both daemon and some code path are quite complex and partly
not fully understood. I would rather guarantee runtime stability within a library version, but not at build time.
The strategy would be increasing the library major version more often.
Any thoughts?
Best,
lynxis
PS. The current concept (because of time pressure) is to keep 2 copies of libosmo-vlr in the code base of osmo-msc and
osmo-sgsn and to move it later out of it into an own library.
As someone knee-deep in OpenBSC settings and attempting to gain a firm understanding of BTS to BSC handovers, I've struck a stumbling block in balancing my technical deep dives with academic duties. Between tracing Abis interface logs and diagnosing paging issues, I barely have time to concentrate on my finance studies. To be honest, I've pondered finding someone to take my accounting class for me so that I can continue with my telco experiments here. I'm not sure whether anyone else is dealing with the same workload, but if you've discovered a solid workflow or technique, I'd love to hear about it because OpenBSC is currently capturing my full attention.
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Dear Osmocom community,
I am pleased to announce the first usable version of my new MGW for
use with OsmoBSC and E1-based BTS:
https://gitea.osmocom.org/themwi/tw-e1abis-mgw
This new sw component works as a drop-in replacement for osmo-mgw in
the role of BSC-associated MGW for E1 Abis. Principal new features
compared to OsmoMGW-E1 are:
* The path from RTP input to fixed-timing TRAU-DL output passes through
ThemWi jitter buffer (twjit), instead of blindly converting every
received RTP packet to a TRAU-DL frame, queueing those frames to
I.460 MUX Tx and hoping for the best.
* For FR codec in the present implementation and for EFR coming later,
a proper UL-to-DL transform (aka TFO transform) is applied to this
RTP-to-DL path. This way if the stream of UL frames from the other
call leg includes gaps due to radio errors, FACCH stealing or DTXu
pauses, or if gaps are caused by packet loss, the stateful transform
will produce proper error concealment or comfort noise insertion per
TS 28.062 section C.3.2.1.1.
* CSD is supported! This development may be the first time in Osmocom
history of CSD working on an E1-based BTS.
I tested this new MGW with Nokia InSite BTS and confirmed it working
with all 3 classic GSM voice codecs (FR, HR and EFR) and with CSD up
to 9600 bps. CSD at 14400 bps (D145_SYNC and EDATA frames) is
supported too, but remains untested due to lack of needed support in
OsmoMSC.
My eventual goal is to use OsmoBSC and this new MGW with Ericsson RBS6k
BTS, consisting of DUG20 and RUS or RRUS. I already have DUG20 and
RUS01 hardware, but given all other work I still have to do on ThemWi
CN software, I haven't got around to playing with Ericsson gear yet.
My plans going forward are:
* Get back to twrtp patches in Gerrit: implement the next round of
changes per last round of review, and hopefully get twrtp into
libosmo-netif so we can make it an option in OsmoBTS, in addition
to E1 BTS.
* Finish long-deferred work on libgsmhr1 in gsm-codec-lib. HRv1 codec
is of course of no practical interest, can be regarded as a "just
for fun" retronetworking feature, but I need to finish it so certain
ThemWi components can rely on having encoders and decoders for all
GSM codecs always available, and my TFO transform for HRv1 will
serve as a stepping stone toward much more important TFO transform
for EFR.
* After the above, the big work item for me will be ThemWi-MSC. I
won't get into details as I don't like writing about vaporware, but
many of you know that currently I am still stuck on 2023-02 version
of OsmoMSC while running newer versions of all other components.
ThemWi-MSC will be my proper solution, but I'll write about it in
detail only when it becomes a reality.
Never stopping work toward restoration of top-quality GSM/2G networks,
Mother Mychaela
Hi all,
After buying a super Sim Kit (16 in 1) from China, I tried the reader (green PCB inside a blue transparent plastic case with a blue LED) and SIM (identified as a fakesupersim) with pysim tool. However i am getting the following error:
/pySim-prog.py -n 26C3 -c 49 -x 262 -y 42 -z 1234 -j 1 -t auto
Insert card now (or CTRL-C to cancel)
Autodetected card type fakemagicsim
Generated card parameters :
> Name : 26C3
> SMSP : e1ffffffffffffffffffffffff058100945555ffffffffffff000000
> ICCID : 8949262427518313026
> MCC/MNC : 262/42
> IMSI : 262422461512085
> Ki : 7b74741a1ee14337ec23f9ab92a13648
> OPC : ccd867d60797d8d45354a51b3ef568ff
Programming ...
Traceback (most recent call last):
File "./pySim-prog.py", line 530, in <module>
card.program(cp)
File "/home/nadicek/pysim/pysim/pySim/cards.py", line 231, in program
self._scc.update_binary('6f30', hplmn + 'ff' * (tl-3))
File "/home/nadicek/pysim/pysim/pySim/commands.py", line 53, in update_binary
return self._tp.send_apdu_checksw(pdu)
File "/home/nadicek/pysim/pysim/pySim/transport/__init__.py", line 87, in send_apdu_checksw
raise RuntimeError("SW match failed ! Expected %s and got %s." % (sw.lower(), rv[1]))
RuntimeError: SW match failed ! Expected 9000 and got 9804.
I checked mailing lists and haven’t found anybody who had similar problem with pysim. Also I have tried forcing different models of SIM, but nothing is working. Obviously I can remove this check from the script file (__init__.py in /pySim/transport), however somebody had a reason to put such condition there. I would like to ask if it is safe to remove that line of code and the purpose of that line of code.
Thanks a lot and best regards
Martin
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