OpenBSC March 2022

openbsc@lists.osmocom.org

8 participants
30 discussions

On the use of 'decmatch' in TTCN-3
by Harald Welte 27 Jan '26

27 Jan '26

Hi, I know that TTCN-3 is still new to a lot of you, but we are writing tons of integration testing against the various osmocom programs in it. It is quite amazing technology, and I would like to ask you to bear with me reading this mail :) Pau was stating the question earlier today on not finding an example on how to use decmatch. Indeed, it took me some months to find that gem in the TTCN-3 world. It solves the problem that you often have during test of layered protocol stacks: you have separate encoders/decoders for each protocol layer, and now you want to match on some of the *inner* payload. So normally, you have some kind of header definition + a binary (octetstring) payload. This happens in RSL with the L3_INFO IE, and just the same on BSSAP/DTAP where again the L3 message (for example call control) is encapsulated inside one information element. Now you have multiple options of addressing the problem: a) hand-written calls to the decoder function b) write na 'emulation' for the entire protocol layer c) use decmatch. a) would look like this (pseudo-code): var octetstring l3oct; var RSL_Message rsl RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, ?)) -> value rsl { var PDU_ML3_MS_NW l3 := dec_PDU_ML3_MS_NW(rsl.payload); if (match(l3, some_template)) { ... do something } ... } Which uses the built-in pattern-matching on the RSL port to match any message that matches the tr_RSL_DATA_REQ template, and stores the resulting RSL message in a variable. It then uses an explicit call to the decoder function of the L3 message, and then uses regular conditional expressions for further matching on that inner L3 payload. This is more or less how you would write in C, python or any other quite imperative programming languages. It's very verbose, time consuming and un-abstract/elegant. TTCN-3 has many declarative aspects to it. Code like the above is a waste of your time :) b) would mean that you implement some test component that handles the RSL messages on its bottom side test port, and the L3 messages on its top side test port. That is a possible way, and if you need a lot of state/logic of RSL, it maeks sense. But what if you really simply want to have a match? Then it would be a lot of effort and a large detour. c) decmatch to the rescue! You can write RSL.receive(tr_RSL_DATA_REQ(g_chan_nr, ?, decmatch tr_RRM_RR_STATUS)) which means: * do a receive on the RSL test port, and match on an incoming RSL message that matches the tr_RSL_DATA_REQ template, with channel number specified, link_id any (?), *and* if the octetstring payload, if decoded, matches the template tr_RRM_RR_STATUS ! This is *extremely* powerful and expressive. It allows you to condense complex, parametric template matching over multiple proocol layers. It would in the end match RSL DATA REQUEST, only if they contained a [valid] encoded RR STATUS. See https://gerrit.osmocom.org/6229 for the actual test case I used for the above examples. Please also note that I never had to even write the function name of the decoder (dec_PDU_ML3_MS_NW), but TTCN-3 *automatically* figures out which decoder function it must call in order to decode from the binary octetstring. Happy (TTCN-3) hacking + Osmocom bugfixing, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

3 3

osmo-gsm-manuals in project repos: I see no .pdf
by Neels Hofmeyr 08 Jan '26

08 Jan '26

Hi Oliver, so I merged the stuff to add the manuals to the individual git repositories, since you said that it works. But when I do --enable-manuals I don't see any PDF files generated. Also a manual 'make pdf' says "nothing to be done". (I probably should have tried it before merging after all) So what am I doing wrong? Alternatively, can you fix it please? ~N

3 3

Pysim error: SW match failed
by Martin Nagy 16 Aug '25

16 Aug '25

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

3 3

Re: Help with sccp library
by mosbah abdelkader 08 Jul '25

08 Jul '25

> 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.

4 3

dynamic traffic channels
by Neels Hofmeyr 20 May '25

20 May '25

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

3 5

Problem while running NIB on Open Cellular Base sation
by Brackley Casinga 31 Jan '24

31 Jan '24

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

2 1

RFC: migrating git.osmocom.org to gitea?
by Harald Welte 01 Apr '22

01 Apr '22

Hi all! [please follow-up-to the openbsc(a)lists.osmocom.org mailing list, if there is any discussion, we don't want to drag it over tons of mailing lists in parallel] Some weeks ago, I created https://osmocom.org/issues/5397 but it seems nobody noticed the ticket or had any comments to it. So let me post this as RFC here on the mailing list: In the past, we had a gitolite/gitosis setup, which was fine in the early days of git, but it means that people cannot easily create new repositories, see who has permissions, and we cannot delegate ownership. Even updating SSH keys requires manual interaction of a sysadmin like me. I would therefore suggest to migrate git.osmocom.org to gitea[1] This would allow the following features: * users can self-create any number of personal repositories (like gitlab/github) * we can create 'organizations' along the line of reasonably independent osmocom member projects like op25, who can then manage their own repos/permissions/... * gitea can link to redmine wiki and redmine issue trackers (rather than using its own built-in) For those repositories hosted in gerrit (mainly CNI), we would still keep git.osmocom.org a read-only mirror, like we do it right now. For those repositories not hosted in gerrit, users/projects could then accept merge requests in gitea. Coupling this with 3rd party authentication via github/gitlab/etc should make it easier for the occasional contributor to submit changes. There is a downside, of course; A lot of repo URLs have to change. Most of our current repositories are at git.osmocom.org/project.git while gitea follows a git.osmocom.org/organization/project.git scheme. I'm not sure there is any way to help to mitigate this... Any thoughts, comments? [1] https://gitea.io/ -- - 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)

5 5

OSMO HnbGW MGW instance config problem
by Sjur Thomas Lien 31 Mar '22

31 Mar '22

Hi Osmocom, I'm setting up osmo-hnbgw and osm-stp ( on centos 8 ) to work with Spidercloud Hnb, and Ericsson MSC/SGSN. Today I had a major breakthrough. I've done my first PS and CS attach, even got voice call up. But it's silent. I see in hnbgw manual that I should configure a co-located MGW instance. I've installed the osmo-mgw, but my problem is the osmo-hnbgw config. There is no option "mgcp" under node hnbgw, so I'm not able to do the config. From my osmo-mgw: OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# list help list [with-flags] show vty-attributes show vty-attributes (application|library|global) write terminal write file [PATH] write memory write show running-config exit end rnc-id <0-65535> log-prefix (hnb-id|umts-cell-id) iuh iucs iups OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# mgcp % Unknown command. OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# OsmoHNBGW(config-hnbgw)# I'm using version [root@tmaeurosmohnbgw osmo_hngw_rpms]# osmo-hnbgw -V OsmoHNBGW version 1.2.1 OsmoHNBGW - Osmocom Home Node B Gateway implementation Copyright (C) 2016 by sysmocom s.f.m.c. GmbH <info(a)sysmocom.de> Contributions by Daniel Willmann, Harald Welte, Neels Hofmeyr License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. [root@tmaeurosmohnbgw osmo_hngw_rpms]# All help highly appreciated. Best regards, /Sjur Internal

2 3

OSMO HnbGW , M3UA problems real MSC and SGSN
by Sjur Thomas Lien 26 Mar '22

26 Mar '22

Hi, I've run into problems with M3UA, getting the link up. Our MSC sends a M3UA DAUD message ( Destination Audit ), which is unknown to HnbGw. This might not be a big problem, but the MSC does not support registering of routing-key. And it looks like because MSC rejects the REG-REQ, the HnbGw restarts the signalling link by sending SCTP SHUTDOWN to MSC. I tried to drop the line routing-key in config file, but REG_REQ was sent anyway. I also tried to enter routing-key with context=0, same thing. Capturing on 'eno2' 1 2022-03-26 09:26:41.480666703 10.30.50.124 -> 10.40.33.6 SCTP 86 INIT 2 2022-03-26 09:26:41.480710694 10.30.50.100 -> 10.40.2.66 SCTP 86 INIT 3 2022-03-26 09:26:41.480971008 10.40.2.66 -> 10.30.50.100 SCTP 206 INIT_ACK 4 2022-03-26 09:26:41.481112284 10.40.33.6 -> 10.30.50.124 SCTP 298 INIT_ACK 5 2022-03-26 09:26:41.481213421 10.30.50.100 -> 10.40.2.66 SCTP 86 INIT 6 2022-03-26 09:26:41.481266735 10.40.2.66 -> 10.30.50.100 SCTP 206 INIT_ACK 7 2022-03-26 09:26:41.483522819 10.30.50.124 -> 10.40.33.6 SCTP 254 COOKIE_ECHO 8 2022-03-26 09:26:41.483629506 10.30.50.100 -> 10.40.2.66 SCTP 162 COOKIE_ECHO 9 2022-03-26 09:26:41.483690725 10.40.2.66 -> 10.30.50.100 SCTP 60 COOKIE_ACK 10 2022-03-26 09:26:41.484110760 10.40.33.6 -> 10.30.50.124 SCTP 64 COOKIE_ACK 11 2022-03-26 09:26:41.484117880 10.40.33.7 -> 10.30.50.124 SCTP 130 HEARTBEAT 12 2022-03-26 09:26:41.486512775 10.30.50.124 -> 10.40.33.7 SCTP 130 HEARTBEAT_ACK 13 2022-03-26 09:26:41.486513593 10.30.50.100 -> 10.40.2.66 M3UA (RFC 3332) 74 ASPUP 14 2022-03-26 09:26:41.486682342 10.40.2.66 -> 10.30.50.100 SCTP 66 SACK 15 2022-03-26 09:26:41.486694401 10.40.2.66 -> 10.30.50.100 M3UA (RFC 3332) 74 ASPUP_ACK 16 2022-03-26 09:26:41.488189055 10.40.2.74 -> 10.30.50.100 SCTP 78 HEARTBEAT 17 2022-03-26 09:26:41.489702157 10.30.50.100 -> 10.40.2.66 SCTP 66 SACK 18 2022-03-26 09:26:41.489730294 10.40.2.66 -> 10.30.50.100 M3UA (RFC 3332) 82 DAUD 19 2022-03-26 09:26:41.492451543 10.30.50.100 -> 10.40.2.66 M3UA (RFC 3332) 118 SACK ERR 20 2022-03-26 09:26:41.532141583 10.40.2.66 -> 10.30.50.100 SCTP 66 SACK 21 2022-03-26 09:26:42.488369158 10.40.2.74 -> 10.30.50.100 SCTP 78 HEARTBEAT 22 2022-03-26 09:26:43.491352631 10.30.50.100 -> 10.40.2.66 M3UA (RFC 3332) 110 REG_REQ 23 2022-03-26 09:26:43.491554237 10.40.2.66 -> 10.30.50.100 M3UA (RFC 3332) 142 SACK ERR 24 2022-03-26 09:26:43.688325732 10.40.2.74 -> 10.30.50.100 SCTP 78 HEARTBEAT 25 2022-03-26 09:26:43.698031665 10.30.50.100 -> 10.40.2.66 SCTP 66 SACK 26 2022-03-26 09:26:44.888336483 10.40.2.74 -> 10.30.50.100 SCTP 78 HEARTBEAT 27 2022-03-26 09:26:46.088347715 10.40.2.74 -> 10.30.50.100 SCTP 78 HEARTBEAT 28 2022-03-26 09:26:53.501539305 10.30.50.100 -> 10.40.2.66 SCTP 60 SHUTDOWN 29 2022-03-26 09:26:53.501628420 10.40.2.66 -> 10.30.50.100 SCTP 60 SHUTDOWN_ACK 30 2022-03-26 09:26:53.504324344 10.30.50.100 -> 10.40.2.66 SCTP 60 SHUTDOWN_COMPLETE ^C30 packets captured [root@tmabuotshark10 ~]# Config file: hnbgw iuh local-ip 10.30.50.69 local-port 29169 iucs remote-addr msc iups remote-addr sgsn cs7 instance 0 point-code 0.69.3 asp asp-clnt-OsmoHNBGW 52905 2905 m3ua local-ip 10.30.50.100 remote-ip 10.40.2.66 remote-ip 10.40.2.74 sctp-role client as msc-as m3ua asp asp-clnt-OsmoHNBGW sccp-address msc routing-indicator PC point-code 0.27.4 asp asp-clnt-OsmoHNBGW2 2905 2905 m3ua local-ip 10.30.50.124 remote-ip 10.40.33.6 remote-ip 10.40.33.7 sctp-role client as sgsn-as m3ua asp asp-clnt-OsmoHNBGW2 sccp-address sgsn routing-indicator PC point-code 0.113.6 log stderr logging filter all 1 logging print extended-timestamp 1 logging print category 1 logging print category-hex 0 logging print level 1 logging print file basename last logging level set-all info Log from Osmo-Hnbgw: 20220326092641479 DLGLOBAL NOTICE Available via telnet 127.0.0.1 4261 (telnet_interface.c:104) 20220326092641479 DLCTRL NOTICE CTRL at 127.0.0.1 4262 (control_if.c:1017) 20220326092641479 DRANAP NOTICE Remote IuCS SCCP addr: RI=SSN_PC,PC=0.27.4,SSN=RANAP (hnbgw_cn.c:488) 20220326092641479 DRANAP NOTICE Remote IuPS SCCP addr: RI=SSN_PC,PC=0.113.6,SSN=RANAP (hnbgw_cn.c:488) 20220326092641479 DRANAP NOTICE Local SCCP addr: RI=SSN_PC,PC=0.69.3,SSN=RANAP (hnbgw_cn.c:524) 20220326092641479 DLSCCP NOTICE OsmoHNBGW: Using SS7 instance 0, pc:0.69.3 (sccp_user.c:549) 20220326092641479 DLSCCP NOTICE OsmoHNBGW: Using AS instance msc-as (sccp_user.c:567) 20220326092641479 DLSCCP NOTICE OsmoHNBGW: Creating default route (sccp_user.c:572) 20220326092641479 DLSS7 INFO 0: Creating route: pc=0=0.0.0 mask=0x0 via AS 'msc-as' (osmo_ss7.c:830) 20220326092641479 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Restarting ASP asp-clnt-OsmoHNBGW, r=(10.40.2.66|10.40.2.74):52905<->l=10.30.50.100:2905 (osmo_ss7.c:1596) 20220326092641479 DLSCCP NOTICE OsmoHNBGW: Using ASP instance asp-clnt-OsmoHNBGW (sccp_user.c:643) 20220326092641479 DLSS7 NOTICE 0: Creating SCCP instance (osmo_ss7.c:457) 20220326092641479 DLSCCP INFO Binding user 'SCCP Maangement' to SSN=1 PC=(no PC) (sccp_user.c:108) 20220326092641479 DLSCCP INFO Binding user 'OsmoHNBGW' to SSN=142 PC=0.69.3 (sccp_user.c:108) 20220326092641479 DRANAP NOTICE Remote SCCP addr: IuCS: RI=SSN_PC,PC=0.27.4,SSN=RANAP (hnbgw_cn.c:549) 20220326092641479 DRANAP NOTICE Remote SCCP addr: IuPS: RI=SSN_PC,PC=0.113.6,SSN=RANAP (hnbgw_cn.c:551) 20220326092641479 DHNBAP NOTICE Using RNC-Id 23 (hnbgw.c:660) 20220326092641479 DMAIN NOTICE Listening for Iuh at 10.30.50.69 29169 (hnbgw.c:665) 20220326092641485 DLINP INFO sizes of 'struct sctp_event_subscribe': compile-time 14, kernel: 14 (stream.c:114) 20220326092641485 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW2: Client connected (r=10.40.33.7:2905<->l=10.30.50.124:2905) (osmo_ss7.c:1856) 20220326092641485 DLSS7 ERROR XUA_ASP(asp-clnt-OsmoHNBGW2)[0x55fc0cbdd780]{ASP_DOWN}: event M-ASP_UP.req not permitted in role SG (xua_asp_fsm.c:420) 20220326092641485 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Client connected (r=10.40.2.74:52905<->l=10.30.50.100:2905) (osmo_ss7.c:1856) 20220326092641490 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Rx M3UA SNM not permitted while ASP in state ASP_INACTIVE (m3ua.c:954) 20220326092643492 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Received MGMT_ERR 'Unsupported Message Class': HDR=(MGMT:ERROR,V=1,LEN=1006632960), PART(T=Error Code,L=4,D=00000003), PART(T=Diagnostic Info,L=40,D=010009010000002c02070024020a0008000000010006000800000000000b000800000001020b0008) (m3ua.c:588) 20220326092643492 DLSS7 NOTICE xua_default_lm(asp-clnt-OsmoHNBGW)[0x55fc0cbd80f0]{RKM_REG}: Ignoring primitive M-ERROR.indication (xua_default_lm_fsm.c:361) 20220326092653499 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Restarting ASP asp-clnt-OsmoHNBGW, r=(10.40.2.66|10.40.2.74):52905<->l=10.30.50.100:2905 (osmo_ss7.c:1596) 20220326092653499 DLGLOBAL ERROR unable to connect socket: (10.40.2.66|10.40.2.74):52905: Cannot assign requested address (socket.c:848) 20220326092653499 DLINP INFO [WAIT_RECONNECT] osmo_stream_cli_reconnect(): retrying in 5 seconds... (stream.c:286) 20220326092653499 DLSS7 ERROR 0: asp-asp-clnt-OsmoHNBGW: Unable to open stream client for ASP asp-clnt-OsmoHNBGW, 10.30.50.100:2905 ==> (10.40.2.66|10.40.2.74):52905 (osmo_ss7.c:1629) 20220326092658509 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Client connected (r=10.40.2.74:52905<->l=10.30.50.100:2905) (osmo_ss7.c:1856) 20220326092658515 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Rx M3UA SNM not permitted while ASP in state ASP_INACTIVE (m3ua.c:954) 20220326092700517 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Received MGMT_ERR 'Unsupported Message Class': HDR=(MGMT:ERROR,V=1,LEN=1006632960), PART(T=Error Code,L=4,D=00000003), PART(T=Diagnostic Info,L=40,D=010009010000002c02070024020a0008000000010006000800000000000b000800000001020b0008) (m3ua.c:588) 20220326092700517 DLSS7 NOTICE xua_default_lm(asp-clnt-OsmoHNBGW)[0x55fc0cbd80f0]{RKM_REG}: Ignoring primitive M-ERROR.indication (xua_default_lm_fsm.c:361) 20220326092710520 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Restarting ASP asp-clnt-OsmoHNBGW, r=(10.40.2.66|10.40.2.74):52905<->l=10.30.50.100:2905 (osmo_ss7.c:1596) 20220326092710520 DLGLOBAL ERROR unable to connect socket: (10.40.2.66|10.40.2.74):52905: Cannot assign requested address (socket.c:848) 20220326092710520 DLINP INFO [WAIT_RECONNECT] osmo_stream_cli_reconnect(): retrying in 5 seconds... (stream.c:286) 20220326092710520 DLSS7 ERROR 0: asp-asp-clnt-OsmoHNBGW: Unable to open stream client for ASP asp-clnt-OsmoHNBGW, 10.30.50.100:2905 ==> (10.40.2.66|10.40.2.74):52905 (osmo_ss7.c:1629) 20220326092715530 DLSS7 INFO 0: asp-asp-clnt-OsmoHNBGW: Client connected (r=10.40.2.74:52905<->l=10.30.50.100:2905) (osmo_ss7.c:1856) 20220326092715536 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Rx M3UA SNM not permitted while ASP in state ASP_INACTIVE (m3ua.c:954) 20220326092717538 DLM3UA ERROR 0: asp-asp-clnt-OsmoHNBGW: Received MGMT_ERR 'Unsupported Message Class': HDR=(MGMT:ERROR,V=1,LEN=1006632960), PART(T=Error Code,L=4,D=00000003), PART(T=Diagnostic Info,L=40,D=010009010000002c02070024020a0008000000010006000800000000000b000800000001020b0008) (m3ua.c:588) 20220326092717538 DLSS7 NOTICE xua_default_lm(asp-clnt-OsmoHNBGW)[0x55fc0cbd80f0]{RKM_REG}: Ignoring primitive M-ERROR.indication (xua_default_lm_fsm.c:361) ^C All ideas/help highly appreciated! Best regards, /Sjur -----Original Message----- From: Sjur Thomas Lien Sent: Friday, March 25, 2022 10:45 AM To: OpenBSC <openbsc(a)lists.osmocom.org> Subject: RE: OSMO HnbGW , problems with SCTP towards real MSC and SGSN Hi, I figured it out by myself😊 Regards, /Sjur -----Original Message----- From: Sjur Thomas Lien <sjur.lien(a)telenormaritime.com> Sent: Friday, March 25, 2022 10:23 AM To: OpenBSC <openbsc(a)lists.osmocom.org> Subject: OSMO HnbGW , problems with SCTP towards real MSC and SGSN Hi, I'm getting closer. But SCTP does not come up, both my real MSC and SGSN sends SCTP ABORT: 283 2022-03-25 08:14:08.200734109 10.30.50.124 -> 10.40.33.6 SCTP 86 INIT 284 2022-03-25 08:14:08.201189770 10.40.33.6 -> 10.30.50.124 SCTP 298 INIT_ACK 285 2022-03-25 08:14:08.201286756 10.30.50.100 -> 10.40.2.66 SCTP 86 INIT 286 2022-03-25 08:14:08.201405921 10.40.2.66 -> 10.30.50.100 SCTP 60 ABORT 287 2022-03-25 08:14:08.204033135 10.30.50.124 -> 10.40.33.6 SCTP 254 COOKIE_ECHO 288 2022-03-25 08:14:08.204405432 10.40.33.7 -> 10.30.50.124 SCTP 130 HEARTBEAT 289 2022-03-25 08:14:08.204423695 10.40.33.6 -> 10.30.50.124 SCTP 64 COOKIE_ACK 290 2022-03-25 08:14:08.204595511 10.40.33.6 -> 10.30.50.124 SCTP 64 ABORT 291 2022-03-25 08:14:08.207135400 10.30.50.124 -> 10.40.33.7 SCTP 60 ABORT SCTP endpoints: SGSN HnbGw MSC ------------------------------------------------------------------------------- 10.40.33.6| <---------> 10.30.40.124 |10.40.2.66 10.40.33.7| 10.30.40.100 <---------> |10.40.2.74 I suspect the source port on HnbGw: Source: 10.30.50.100 Destination: 10.40.2.66 Stream Control Transmission Protocol, Src Port: 38989 (38989), Dst Port: 2905 (2905) Source port: 38989 Destination port: 2905 The MSC sends ABORT as answer to SCTP-INIT. But our SGSN seems to accept INIT and COOKIE, but eventually sends ABORT. OsmoHNBGW> show version OsmoHNBGW 1.2.1 (OsmoHNBGW). So a few questions: - I tried to set local port to 2905 under asp in config file, but was rejected ( no such command ). So is there a way to set source port ? - In MSC and SGSN we must give local and remote port for the SCTP link. Have you tested HnbGW with real Ericsson MSC and SGSN ? - There are many parameters and timers connected to SCTP protocol: HBInterval 3; MaxAssociationRetransmits 10; MaxInitRetransmits 3; MaxPathRetransmits 5; RTOInitial 3000; RTOMax 6000; RTOMin 1000; ValCookieLife 60000; Are these hardcoded, or could they be configured ? Thanks, /Sjur Internal Internal Internal

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OSMO HnbGW , problems with SCTP towards real MSC and SGSN
by Sjur Thomas Lien 25 Mar '22

25 Mar '22

Hi, I'm getting closer. But SCTP does not come up, both my real MSC and SGSN sends SCTP ABORT: 283 2022-03-25 08:14:08.200734109 10.30.50.124 -> 10.40.33.6 SCTP 86 INIT 284 2022-03-25 08:14:08.201189770 10.40.33.6 -> 10.30.50.124 SCTP 298 INIT_ACK 285 2022-03-25 08:14:08.201286756 10.30.50.100 -> 10.40.2.66 SCTP 86 INIT 286 2022-03-25 08:14:08.201405921 10.40.2.66 -> 10.30.50.100 SCTP 60 ABORT 287 2022-03-25 08:14:08.204033135 10.30.50.124 -> 10.40.33.6 SCTP 254 COOKIE_ECHO 288 2022-03-25 08:14:08.204405432 10.40.33.7 -> 10.30.50.124 SCTP 130 HEARTBEAT 289 2022-03-25 08:14:08.204423695 10.40.33.6 -> 10.30.50.124 SCTP 64 COOKIE_ACK 290 2022-03-25 08:14:08.204595511 10.40.33.6 -> 10.30.50.124 SCTP 64 ABORT 291 2022-03-25 08:14:08.207135400 10.30.50.124 -> 10.40.33.7 SCTP 60 ABORT SCTP endpoints: SGSN HnbGw MSC ------------------------------------------------------------------------------- 10.40.33.6| <---------> 10.30.40.124 |10.40.2.66 10.40.33.7| 10.30.40.100 <---------> |10.40.2.74 I suspect the source port on HnbGw: Source: 10.30.50.100 Destination: 10.40.2.66 Stream Control Transmission Protocol, Src Port: 38989 (38989), Dst Port: 2905 (2905) Source port: 38989 Destination port: 2905 The MSC sends ABORT as answer to SCTP-INIT. But our SGSN seems to accept INIT and COOKIE, but eventually sends ABORT. OsmoHNBGW> show version OsmoHNBGW 1.2.1 (OsmoHNBGW). So a few questions: - I tried to set local port to 2905 under asp in config file, but was rejected ( no such command ). So is there a way to set source port ? - In MSC and SGSN we must give local and remote port for the SCTP link. Have you tested HnbGW with real Ericsson MSC and SGSN ? - There are many parameters and timers connected to SCTP protocol: HBInterval 3; MaxAssociationRetransmits 10; MaxInitRetransmits 3; MaxPathRetransmits 5; RTOInitial 3000; RTOMax 6000; RTOMin 1000; ValCookieLife 60000; Are these hardcoded, or could they be configured ? Thanks, /Sjur Internal

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