OpenBSC June 2022

openbsc@lists.osmocom.org

13 participants
23 discussions

call between different MSCs
by a.r.nasab＠chmail.ir 14 Jun '22

14 Jun '22

Hi I'm going to establish a call between two MSes on two different MSCs . Is This Scenario possible without an external application (for MNCC interface)? Are there any options other than LCR(Linux Call Router)? Best Regards

2 1

Request - USIM/ISIM JavaCard Repo Access
by Jeremy Solmonson 07 Jun '22

07 Jun '22

Hi Osmocom Team, Long time listener, first time writer. Short Version: Would it be possible to get the source for your USIM/ISIM JavaCard applets that are installed on the sysmoISIM-SJA2, please? The Alternative: I've been researching a method to give my JavaCard applet default installation, and if my applet doesn't support the ADPU command, then it will revert back to your USIM/ISIM applet. Unfortunately, I have not found a solution. If you know of one, this would solve my ADPU update problem. Long Version: I've been looking into how SmartCards work and got interested in SIM card pertaining to JavaCard applets. I am interested in creating my own ADPU commands while still supporting all other ADPU commands that USIM/ISIM provide. Given the awesomeness of your products and dedication to open source research, I was hoping you can help me by providing the source. This way, I can overwrite the USIM/ISIM applets on the sysmoISIM-SJA2, and support my new ADPU updates. BTW, I looked/searched for these in your github repos and could not find these applets. Let me know if this is possible. Thanks for being awesome! -- Jeremy S.

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Using Osmocom CNI to operate a "real" cellphone network
by Mychaela Falconia 07 Jun '22

07 Jun '22

Hello Osmocom community, Is there anyone here who uses Osmocom CNI software to operate a "real" cellular phone network (2G or 3G or both) anywhere in USA, or am I going to be the first? By "real", I mean operating a cellular phone network that strives to provide a user experience to its subscribers that is as close as possible to what one would get from a "regular" operator like AT&T or T-Mobile, aside from much much smaller coverage area, perhaps as small as the operator's house and its immediate surroundings. But aside from the tiny coverage area, all other aspects of user experience need to be fully "real": each subscriber gets a real 10-digit phone number in the North American Numbering Plan, can receive calls and SMS at this number, and can place calls and send SMS to the outside world, with the user's real NANP number appearing as the source. The principal difference from a self-contained classic NITB setup is that subscribers' MSISDNs are real NANP, rather than made-up "extension" numbers, plus a PSTN gateway implementation for outside connectivity. Is there anyone in USA (or anywhere else in the world, substituting your country's "real" numbering plan for NANP) who operates an Osmocom CNI network in this manner? If there isn't, I will be happy to be the first, and I will also be quite happy to publish the source for all of the custom sw components I'm going to develop for this task - which I plan to implement as add-ons to Osmocom CNI, connecting via MNCC, SMPP and GSUP interfaces, rather than patches to Osmocom sw components themselves. However, if I am not the first to embark on such a venture, it would be nice to know how others have done it before me, so I can make a more informed decision as to what I can reuse vs which wheels I would rather reinvent per my own taste. Someone please correct me if I'm wrong, but it is my understanding that Rhizomatica (the most "real" and "production" user of Osmocom CNI I know of) does things differently from what I envision: aside from being in Mexico rather than USA (hence no NANP), it is my understanding (again, someone please correct me if I'm wrong) that they don't give their individual subscribers (end users) direct phone numbers in the Mexican numbering plan, directly reachable from anywhere in the world as +52-xxxxx, instead subscribers get "extension" numbers that are meaningful only inside those special village networks. In other words, a PBX-style network like the inside of a company with phone extensions, rather than direct PSTN phone numbers. I currently plan on using bulkvs.com as my North American PSTN connectivity back-end provider with real NANP phone numbers, at least for voice - I haven't found a solution for P2P SMS connectivity yet, but because of the complexity of the task, I decided to break it into pieces and focus on just voice at first. However, if someone else has already done something similar, operating your own cellular network where your subscribers get real 10-digit NANP phone numbers instead of just internal extensions, I would be interested in knowing whom you use (or used) as your back-end provider for PSTN connectivity and source of phone numbers, and if anyone was able to get P2P SMS included in the deal. M~

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OpenBSC June 2022