OpenBSC November 2020

openbsc@lists.osmocom.org

13 participants
25 discussions

pySim incorrectly detecting as OpenCells-SIM?
by Albert Franklin 06 Nov '20

06 Nov '20

Hello I tried to buy a sysmoISIM-SJA2 but it was not available to my region, so I acquired a Chinese writable sim card with adm keys (https://www.aliexpress.com/item/32813645415.html). With their software I can read PIN, PUK, ADM, ISMI, PLMN, EHPLMN, etc exactly as on the image on the link mentioned. pcsc_scan detected it (even with a weird name) from a Chinese brand manufacture using https://github.com/LudovicRousseau/pcsc-tools/blob/master/smartcard_list.txt. I tried pySim-read and it failed on the end saying that OpenCellsSim' object has no attribute 'read_ehplmn'. I'm sharing the full output if anyone is interested. It's weird because it fails to read ISMI and ICCID for example and other fields. I started recently studying this area, I took a look at pySim code and looks like that it's based on size of data to detect if it's OpenCells or not (which I believe is not my case). Is there a easy way to know if my Chinese card is OpenCells or whatever they are? $ ./pySim-read.py -p 0 Using PC/SC reader interface Reading ... Autodetected card type: OpenCells-SIM ICCID: IMSI: None GID1: ffffffff GID2: ffffffff SMSP: ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff SPN: CMCC Display HPLMN: False Display OPLMN: False PLMNsel: 32d00032d01034f06045f08032f32212f020ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff PLMNwAcT: ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused OPLMNwAcT: 32d0004000 # MCC: 460 MNC: 000 AcT: E-UTRAN 32d0008000 # MCC: 460 MNC: 000 AcT: UTRAN 32d0000080 # MCC: 460 MNC: 000 AcT: GSM ... ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused HPLMNAcT: 32d0004000 # MCC: 460 MNC: 000 AcT: E-UTRAN 32d0008000 # MCC: 460 MNC: 000 AcT: UTRAN 32d0000080 # MCC: 460 MNC: 000 AcT: GSM ACC: ffff MSISDN: Not available Administrative data: 00000002 MS operation mode: normal operation Ciphering Indicator: disabled SIM Service Table: ff33ffff00003f033000f0c3 Service 1 - CHV1 disable function Service 2 - Abbreviated Dialling Numbers (ADN) Service 3 - Fixed Dialling Numbers (FDN) Service 4 - Short Message Storage (SMS) Service 5 - Advice of Charge (AoC) Service 6 - Capability Configuration Parameters (CCP) Service 7 - PLMN selector Service 8 - RFU Service 9 - MSISDN Service 10 - Extension1 Service 13 - Last Number Dialled (LND) Service 14 - Cell Broadcast Message Identifier Service 17 - Service Provider Name Service 18 - Service Dialling Numbers (SDN) Service 19 - Extension3 Service 20 - RFU Service 21 - VGCS Group Identifier List (EFVGCS and EFVGCSS) Service 22 - VBS Group Identifier List (EFVBS and EFVBSS) Service 23 - enhanced Multi-Level Precedence and Pre-emption Service Service 24 - Automatic Answer for eMLPP Service 25 - Data download via SMS-CB Service 26 - Data download via SMS-PP Service 27 - Menu selection Service 28 - Call control Service 29 - Proactive SIM Service 30 - Cell Broadcast Message Identifier Ranges Service 31 - Barred Dialling Numbers (BDN) Service 32 - Extension4 Service 49 - MExE Service 50 - Reserved and shall be ignored Service 51 - PLMN Network Name Service 52 - Operator PLMN List Service 53 - Mailbox Dialling Numbers Service 54 - Message Waiting Indication Status Service 57 - Multimedia Messaging Service (MMS) Service 58 - Extension 8 Traceback (most recent call last): File "./pySim-read.py", line 255, in <module> (res, sw) = card.read_ehplmn() AttributeError: 'OpenCellsSim' object has no attribute 'read_ehplmn' As I can't buy the sysmoISIM-SJA2 where I live, I searched for other sellers. I found this one (https://www.aliexpress.com/i/32272726951.html) where an user wrote "+ Devices work. + Use GRSIMWrite to program them initially. After you do this, you will know PIN-ADM so then pysim will work. - PsiWords could spend a little time pointing people at correct software to program cards. That would be, as they like to say, much more professional! (Especially if they want repeat business!) 21 Aug 2018 16:43". I'm curious if this card sold by other user just have a different encoding / format to read/write data from mine, because the PIN + ADM keys I also can obtain from their software, however, since my card is in another format I don't believe that I will have success to write it. Am I wrong? I saw the list of supported SIM cards and some of them are very limited. Someone already acquired a SIM card with great compatibility with pysim from China? I searched for supersim, fakemagicsim and some combinations and no success. fakemagicsim supersim magicsim grcardsim sysmosim-gr1 sysmoSIM-GR2 sysmoUSIM-GR1 sysmoUSIM-SJS1 Fairwaves-SIM OpenCells-SIM Wavemobile-SIM sysmoISIM-SJA2 Any help or advise is very welcome. -- Sent with https://mailfence.com Secure and private email

1 0

osmo-st-* projects
by Mykola Shchetinin 04 Nov '20

04 Nov '20

Hello there! The question out of curiosity. Hard to not notice quite a few of projects written in Smalltalk. Why was cellular network implementation in Smalltalk abandoned? Or was everything in C initially and you just tried out Smalltalk as a possible alternative? What was your thinking back then? Interested to know some history. Thanks a lot! P.S. of course, I see some stuff in Erlang as well, but it has an awesome Diameter support which kind of answers a similar question but related to Erlang.

2 1

Final death of the NITB, really this time.
by Keith 02 Nov '20

02 Nov '20

Hi all, I just noticed that osmo-bts commit 6d117891c93da969e0ff8b293bef97c699490f2b is the last version that can be brought up by the openBSC aka osmo-nitb. Which makes me wonder now, should the openbsc / osmocom-nitb package continue to be published to repositories?

2 1

GGSN operation / feature
by Keith 02 Nov '20

02 Nov '20

Hi All, I have scanned 3GPP documents for info on the GGSN IP network facing side, IIUC how the GGSN responds there is "out of scope" - I'm specifically wondering about sending ICMP host unreachable messages in response to packets for IPs that are not currently active in the pool. Sometimes it would happen where I was pinging an IP assigned to an MS while looking at other things in the SGSN and PCU but in the meantime the MS would cycle the PDP context and have a new IP. For this and maybe other reasons I wrote a proof of concept, probably not great code, but working, patch to have the GGSN send ICMP host unreachable. Do you think this is a desirable feature? If so I would try to clean it up and submit to code review. Also if in agreement, would it be worth making it switchable via a vty param? I am thinking of where one might not want the IP space to be probable, although I would assume that kind of thing is best left to the local firewall implementation. Patch here: http://git.osmocom.org/osmo-ggsn/?h=keith%2Ficmp Thanks. K.

2 1

Re: NMT-450
by Sipos Csaba 01 Nov '20

01 Nov '20

Hi Andreas, I pulled the new master, rebuilt my setup from source in a clean state and it works as it should. One more question though: is it possible to use the MNCC socket to connect the NMT-450 network to 2G (via Osmo-BSC), or to SIP via LCR? Thanks again! Regards, Csaba

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OpenBSC November 2020