Hi,
I was going through the features of osmoepdg solution and thought to ask few questions regarding the implementations.
1. In most of deployment tunnel authentication is bypassed. So, even if UE send CERTREQ, it is getting ignored at ePDG. ePDG also doesn't send anything to UE.
Do you have any idea of how to implement that in strongswan or have you explored that earlier? I saw that in 3gpp 33.402 and RFC 5996, certificate things are optional.
However, I know that strongswan authentication is tightly coupled, so just trying understand if you have already bypass it by doing any changes in strongswan or atleast know how it should be done.
2. There are many error and status codes written in ePDG standard 24.302 clause 8. Have you mapped all EPC core error to corresponding IKEv2 error or status codes?
Thanks & Regards
Subhajit Chatterjee
New Delhi
Dear list,
FR calls between mobile phones are working fine, but when I change the
codec-list to
"codec-list fr2 fr1 fr3" or "codec-list fr3 fr1 fr2", I am getting a
Remote Transcoder Failure:
lchan(0-0-1-TCH_F-0)[0x630d01c78b80]{ESTABLISHED}: (type=TCH_F)
CONNECTION FAIL (cause=Remote Transcoder Failure [ 28 ])
In the BSC config:
codec-support fr efr amr
codec-list fr2 fr1 fr3
In the MSC config:
mncc-int
default-codec tch-f fr
default-codec tch-h hr
Both the phones and the BTS is FR/EFR/AMR capable.
I am fairly sure with Osmo-NITB at least EFR was working with these
phones and BTS some years ago.
If needed, I can provide a pcap.
If someone has an idea, please let me know.
Regards,
Csaba
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Dear list,
I wonder if anyone has access to Nokia Flexi BTS or Flexi EDGE /
Multiradio equipment and can provide access to it for the purpose of
adopting Osmo-BSC to support for these units?
In case someone has a unit like this (with whatever radio), please let me know.
Regards,
Csaba
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Dear list,
At the moment setting up the RSL lapd link and start its bootstrap
(BCCH info and SACCH filling) is done in one go (as much as I can
see).
The issue with this is for the Nokia Site family: per spec. we should
let the RSL lapd link to be initiated by the BTS and once that lapd
link is up, the BTS sends a BTS_STATE_CHANGED message with "TRX,
enabled" object id and object current state, and only after this we
should start sending the BCCH info and SACCH filling (the "actual"
bootstrap of the RSL).
For this to work, we need the Object Identity and Object Current State
attributes (which is a WIP atm), but somehow it should be possible to
separate the RSL bootstrap to RSL lapd only and RSL bcch info + sacch
filling.
I am unaware if the above separation is possible with the current
codebase, but if someone can shed some light on this, that would be
appreciated.
Adding the Object Identity and Object Current State will also allow us
to detect the actual state changes of various BTS objects (mostly the
TRX), and we can also use the BTS_CHA_ADM_STATE to actually
lock/unlock TRXes, so we dont need to fake the 12.21 state anymore.
Regards,
Csaba
Hello Osmocom community,
Over the past several months I developed my own RTP endpoint
implementation library (alternative to libortp), and I seek to get it
merged into libosmo-netif so it can be used by OsmoBTS as an option:
https://gerrit.osmocom.org/c/libosmo-netif/+/39280https://gerrit.osmocom.org/c/libosmo-netif/+/39281https://gerrit.osmocom.org/c/libosmo-netif/+/39291
I am now working on documentation, which I need to finish before I can
lift these patches out of WIP in Gerrit. The last of the 3 WIP patches
linked above is the one adding an adoc manual, built with the same
tools as other Osmocom manuals, and I need some help with this one:
1) When I run './configure --enable-manuals' followed by 'make' on the
Debian machine which Vadim provided to me for Osmocom documentation
work, everything seems successful and I get a PDF rendering of my WIP
manual. However, as soon as I uploaded this patch to Gerrit, I see a
build failure in Jenkins. What am I doing wrong? I'm afraid that my
knowledge of Autotools is not good enough to figure this one out.
2) My progress in writing the actual manual has reached the point
where I need to insert some graphical diagrams showing the flow of RTP
packets and the latency and jitter they experience in transit. I am
thinking of one horizontal axis showing regularly spaced packets as
they are emitted by the source, then forward-and-down arrows showing
their transit with fixed or variable latency, then another horizontal
axis below showing the receiver's view of time, with marked arrival
times of packets (endpoints of latency arrows) and fixed-spacing times
when the GSM or TDM system polls the jitter buffer.
Question: what is the appropriate tool within the accepted Osmocom
adoc suite for drawing such diagrams? If I weren't trying to get my
RTP implementation accepted into Osmocom, I would have written this
manual in troff on my favorite 1980s UNIX system, using pic preprocessor
in the troff suite for graphical drawings like this one - but I reason
that I need to write my manual within Osmocom documentation framework
in order to maximize the chance of the associated code library being
accepted into libosmo-netif, with follow-on patches to osmo-bts to use
it optionally as an alternative to libortp.
3) When I do successful test builds on Vadim's Debian machine and get
a PDF rendering of my WIP manual, the cover page in the PDF features
both Sysmocom and Osmocom logos just like the mainstream Osmocom
manuals, with Sysmocom logo on top. While this arrangement is probably
appropriate for the existing manuals which were written predominantly
by members of Sysmocom crew, it seems quite wrong for an external
contributor's manual that does not contain a single sentence written
by Sysmocom. How do I tweak things to remove that Sysmocom logo from
the cover page, or even better, put San Diego 2G Association logo in
its place? My contributions to Osmocom are directly linked to my
efforts to build a new GSM network in San Diego, hence there is some
symmetry between Sysmocom and SD2G in terms of Osmocom FLOSS project
contributions, except for the rather big asymmetry in that SD2G is
strictly non-profit.
M~
Hi!
I am in possession of a pair of Siemens BS11 mounting plates and am
looking for a second pair. A photo of the plates is attached.
Since - I believe - most people who play with such basestations do not
mount them to a wall or pole, my hope is that some unused ones are
floating around somewhere.
Thanks,
-Alex^Wblackbit
Hello.
I have tested CSFB on several phones in different situations. Calls from 4G
to 2G are always established, but calls from 2G to 4G and from 4G to 4G are
not always successful (sometimes they connect, and sometimes they do not).
For this test, the phone's location relative to my USRP antennas is fixed.
It is noteworthy that I have set the 4G neighbor in Osmo-BSC, as well as
the 2G ARFCN information in SIB7. I attched log file and pcap of osmo
system.
osmo system ip:192.168.75.192
srsran_4G ip:192.168.75.185
open5gs ip:192.168.75.181
I would be very grateful if anyone with experience in this field could help
me.