> I don't understand. This callback will be called with data you need to
write
> to the network. In case of MTP Level3 you will need to wrap that around
the
> msgb you got.
I means: is the interaction with mtp3 layer implemented (is sending sccp
data by mtp3 implemented by the library?)?
Also, what about the reception of data from mtp3 layer. is that implemented
in the sccp lib.
I am asking these questions because I see the code of mtp3 in the lib but no
significant call is present in the sccp part of the lib.
Thank you for your help.
On Tue, Jun 28, 2016 at 10:05:28AM +0200, Harald Welte wrote:
> [translated from german]
> is it certain that we switch a channel to PDCH only when
> gprs mode != none?
A TS can be GSM_PCHAN_TCH_F_PDCH; those are the only ones for which we
send a PDCH ACT message.
We send a PDCH ACT message
- during init (CHANNEL OML's state changed to enabled -> send PDCH ACT),
- and upon channel release ack when pchan == GSM_PCHAN_TCH_F_PDCH.
So the question is, when we receive a channel release ack, could that be
the PDCH release and we switch PDCH right back on by accident? No, because
we only receive a chan rel ack when the *TCH/F* is being released.
That is because the PDCH release is initiated "internally" from the PDCH
DEACT, and thus this condition in common/rsl.c rsl_tx_rf_rel_ack() catches
on, which existed before dyn PDCH:
if (lchan->rel_act_kind != LCHAN_REL_ACT_RSL) {
LOGP(DRSL, LOGL_NOTICE, "%s not sending REL ACK\n",
gsm_lchan_name(lchan));
return 0;
}
In rsl_rx_rf_chan_rel() the rel_act_kind is set to LCHAN_REL_ACT_RSL, but
not in the rsl_rx_dyn_pdch().
This is analogous to the ip.access way -- the ip.access nanobts replies to
a PDCH DEACT with a PDCH DEACT ACK and doesn't send a separate channel
release ack.
Maybe we could set rel_act_kind to some new LCHAN_REL_ACT_IPAC_DYN_PDCH
for clarity? (But we shouldn't actually send a release ack, to stay
compatible.)
Even though it works as-is, we should indeed add another flag check:
- We do check the flags that no ACT/DEACT is already pending;
- And we do send a PDCH DEACT only if ts->flags & TS_F_PDCH_ACTIVE;
- But we would send a PDCH ACT despite ts->flags & TS_F_PDCH_ACTIVE.
This should never happen, but it would make sense to ensure that.
~Neels
Hi all,
Just wanted to share an issue and a quick workaround I found for it in case
anyone else has the same problem. I believe a cmd2 update is causing
pySim-shell to fail. After installing it on a fresh install of Ubuntu
Server 20.04 and getting the following error when I run "python3
pySim-shell -p0":
>Using PC/SC reader interface
>Autodetected card type: sysmoUSIM-SJS1
>AIDs on card:
> USIM: a0000000871002ffffffff8907090000
>Traceback (most recent call last):
> File "pySim-shell.py", line 512, in <module>
> app = PysimApp(card, rs, opts.script)
> File "pySim-shell.py", line 59, in __init__
> super().__init__(persistent_history_file='~/.pysim_shell_history',
allow_cli_args=False, use_ipython=True, auto_load_commands=False,
command_sets=basic_commands, >startup_script=script)
>TypeError: __init__() got an unexpected keyword argument 'use_ipython'
If you run into this you can fix it by uninstalling cmd2 and reinstalling
cmd2 with "pip3 install cmd2==1.5".
Best,
Bryan
Hi,
I had a problem placing MO GSM calls from a Siemens S11E: The calls
were dropped immediately; Osmo-MSC reports "Cannot compose Channel
Type from bearer capabilities"
After investigating the SETUP request from the S11E, the phone does
not use octet 3a (no extension bit set in IE 3). Wireshark decodes the
radio channel requirement as "Full rate support only MS/fullrate
speech version 1 supported", so I added a condition to the gsm48_ie.c
function of libosmocore to include at least GSM FR in the list of
available speech_ver in case octet 3 has no extension.
Attached to this message are the Abis-IP PCAP traces of MO calls, and
the patch for gsm48_ie.c.
Regards,
Lennart
Hi,
My name is Brackley Cassinga Form DRC, we run a community network called
pamoja net where we offer gsm services using osmocom open source software
and OC Base station.
Recently I have tried to install another base station as the same installed
but I could not find any resource guiding through all the steps to take to
run NIB on a base station.
I'm currently running Ubuntu and I will appreciate if you could guide me on
the installation of BSC,hlr,MSC , in order to run a basic gsm network.
Thank you. Regards
--
*Ir Brackley heshima Casinga **Pacifique*
*CEO and Founder of kwanzatechnologie*
KwanzaTechnologies ,GlobalElectronics
+243977265291 | +243977265291 | Pcassinga(a)gmail.com/
brackley(a)ensemblepourladifference.org
www.kwantechnologies.jimdosite.com <http://www.kwantechnologies.com/> |
Skype: Brackley cassinga <https://webapp.wisestamp.com/#>
Av Semliki N 43
Hi
We set up a full Osmocom platform, with an Ettus USRP for SDR. All works
well. Congratulations to Osmocom developers !
But now we want to use "real" nodes concerning MSC, MGW, HLR, SGSN & GGSN.
Do you think it is possible ?
Concerning the BSC-MSC association, do we need to use an SG (osmo-stp) ? or
could we establish a Point To Point BSC-MSC ? SUA ?
Concerning MGW, is there a way to use our MGW ? At this time, with Osmocom
corposants, we can see RTP traffic between BTS-TRX and MGW, and some MGCP
traffic between (BSC - local MGW) and MGW, and some MGCP traffic between
osmo-MGW and osmo-MSC. Is there a way to have a "more standard"
architecture: no traffic between BTS and MGW, and MGW controlled by MSC ? Do
we have to more study TRAU, AoIP ?
Concerning the Gb, do you think that it 'll work if we configure the Gb on a
real SGSN connected to the osmo-pcu, hosted on the osmo-bts-trx?
Many thanks in advance,
Best regards
Jean-Marc
Orange Restricted
It is my pleasure to inform that I have a WIP patch for OsmoMSC that allows,
for the first time, full MO<->MT codecs negotiation to flexibly achieve TFO
(Transcoding-Free Operation).
It would be great if OsmoMSC users could give the patch a spin (in a setup that
is allowed to fail because of the patch) and see if 2G calls now adjust the MO
call leg to MT's codecs limitations for you. Looking forward to feedback!
This task was idling on my list because I assumed it would be a big effort, but
now I realized that it is actually simple, not even a new FSM state required.
So I could no longer resist to finally complete this long long quest.
The result is this WIP patch:
https://gerrit.osmocom.org/c/osmo-msc/+/35051
Related patch series, uncluding ttcn3 test:
https://gerrit.osmocom.org/q/topic:reass
This patch requires full SDP on MNCC, so if using osmo-sip-connector, it should
be current master -- the relevant patch was merged but is not released yet:
https://gerrit.osmocom.org/c/osmo-sip-connector/+/16222
Before this patch, MO was eternally stuck on the initially assigned codec. Now
we adjust MO's codec if MT needs it. (MT already intelligently chooses codecs
before this patch.)
For example, if MO is AMR capable and MT is not,
- the MO side will start out with assigning an AMR codec (not matching).
- Once MT responds (MNCC_ALERT_REQ), the MO side notices that MT does not
support the assigned codec. It sends another Assignment Command to the BSC,
offering only the codecs that MT supports.
- If MO has at least one matching codec (say GSM-FR), the result is a TFO call
using a matching codec.
We still need to check:
- does OsmoBSC play along nicely with the re-assignment (it should AFAICT).
- effects on MGCP: there may now be more codecs than just the assigned one in
the MGCP towards the MGW. See if that checks out.
- effects on 3G: make sure the feature doesn't confuse IuUP handling.
The patch passes all MSC_Tests.ttcn for me (but that doesn't necessarily imply
proper codecs choices, the tests are not very strict there it seems).
~N
--
- Neels Hofmeyr <nhofmeyr(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
* Geschäftsführer / Managing Directors: Harald Welte
Dear Osmocom community,
we're happy to announce the next incarnation of OsmoDevCall.
when:
(today) November 15, 2023 at 20:00 CET
where:
https://osmocom.org/OsmoDevCall (Big Blue Button)
This time, @falconia will be presenting on
Calypso chipset history and development boards, from TI to FreeCalypso
This meeting will have the following schedule:
20:00 meet + greet
20:10 topic as outlined above
21:00 unstructured supplementary social event [*]
Attendance is free of charge and open to anyone with an interest
in Osmocom or open source cellular technologies.
More information about OsmoDevCall, including the schedule
for further upcoming events can be found at
https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCall
Looking forward to meeting you soon!
Best regards,
Harald
[*] this is how we started to call the "unstructured" part of osmocom
developer conferences in the past, basically where anyone can talk about
anything, no formal schedule or structure.
--
- Harald Welte <laforge(a)osmocom.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
