Hi Mychaela,
The AMR capability works great with your drop-in MGW implementation, voice quality improved a lot. I also tested the FR/EFR part earlier, which also works as expected. CSD is definitely interesting, once I have at least two CSD capable devices, I will give that a try as well. We already tried with a Nokia MetroSite, and early next year I am planning to try with our UltraSite setup at the museum as well. Would be nice to be able to send fax on top of GSM :-)
The OML dialect we have in Osmocom now (called "nokia_site") despite its name it supports old Nokia equipment up to Felxi EDGE, Multiradio and Multiradio10 (on E1), if anyone else is interested, so OML support is not limited to just the Nokia *Site family. Some of this stuff is still running in less fortunate countries... Little bit of tweaking will likely needed, but at least it is not a completely unknown part like AoIP.
Regards, Csaba
Sipos Csaba dchardware@gmail.com wrote:
The AMR capability works great with your drop-in MGW implementation, voice quality improved a lot. I also tested the FR/EFR part earlier, which also works as expected.
Hi again Csaba, and thank you for publicly acknowledging your positive experience with this new E1 Abis MGW!
CSD is definitely interesting, once I have at least two CSD capable devices, I will give that a try as well.
As a heads-up, one interesting feature of my planned ThemWi MSC (a more complete implementation of traditional MSC functionality, using osmo-msc with some upcoming patches as just the front end) will be ability to make single-leg CSD calls, needing only one GSM MS. There will be a separate daemon process dedicated to this function, and you will be able to define special phone numbers that interwork CSD either to a Telnet BBS or to Internet with PPP. I also plan to implement interworking to ISDN and analog modem emulation (modem or fax waveforms inside G.711 PCM sample stream of what looks like a voice call to IP-PSTN) exactly per GSM 09.07 - but these plans are fairly distant for now...
We already tried with a Nokia MetroSite, and early next year I am planning to try with our UltraSite setup at the museum as well.
Given the similarity between MetroSite and UltraSite, it would be unlikely to have one work but not the other - but of course it will be nice to have a confirmation.
Would be nice to be able to send fax on top of GSM :-)
Interworking between GSM and PSTN in fax mode (send GSM fax to or receive one from a more traditional fax machine that sits on an analog POTS line) is a function defined in GSM 03.45 - and yes, I do plan to implement it, once again speaking the necessary waveforms inside G.711 PCM sample stream to IP-PSTN.
Little bit of tweaking will likely needed, but at least it is not a completely unknown part like AoIP.
Small but important nitpick: AoIP is fully known because it is a 3GPP standard. Instead the part that is largely unknown is how each BSS vendor implemented their own proprietary version of Abis-IP, particularly the user plane. It _seems_ that both Ericsson and Nokia implemented proprietary packet formats on Abis-IP that (in terms of information content) can be converted to either TRAU frames or AoIP - but details are scarce.
M~
This is fantastic news, Csaba! It's great to hear that the AMR implementation is delivering such a significant improvement in voice quality, and that the FR/EFR parts are working flawlessly too. The progress with OML dialect supporting a wide range of Nokia equipment, even legacy setups in regions that need it most, is also incredibly valuable work. I'm keen to hear about your CSD tests once you get those devices. For anyone looking to clearly visualize complex technical diagrams or documentation related to these GSM systems, you might find a tool that can transform images into descriptive text useful. On a related note, if you ever need to generate AI prompts from visual references, https://aicartoongenerator.org/image-to-prompt could be a handy resource. Keep up the excellent work!
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This is a fantastic update, Csaba! It's great to hear the AMR capabilities are significantly improving voice quality with the MGW implementation, and that FR/EFR also performs as expected. Your efforts in extending OML dialect support to encompass a wider range of Nokia equipment, beyond just the *Site family, are truly commendable and will definitely benefit many, especially where this older tech is still prevalent. The prospect of CSD with fax capabilities is intriguing – good luck with the UltraSite setup! For anyone documenting these advancements, remember that tools like https://mdtoword.org can be incredibly useful for converting technical notes into shareable Word documents.
This is fantastic news, Csaba! It's great to hear that the AMR implementation is truly delivering on improved voice quality with the MGW, and that FR/EFR are also performing as expected. The dedication to CSD, even with the plans for museum setups, is genuinely inspiring – sending fax over GSM would indeed be a neat trick! It's also incredibly insightful to learn about the "nokia_site" OML dialect's broad compatibility, especially its support for older Nokia equipment. This kind of detailed, practical feedback is invaluable for the OpenBSC community.
On a slightly different note, for anyone working with documentation or presentations for these projects, I've found https://merge-jpg.com to be incredibly useful for combining images effortlessly. It’s in-browser and keeps everything private, which is a huge plus.
Nice to hear the AMR's working well! Fax over GSM sounds like a cool idea. Also, if anyone's looking for a way to convert Markdown to Word easily, check this out: <a href="https://markdowntoword.pro" target="_blank">MarkFlow</a>.
Sounds like you’re diving deep into AMR and CSD—nice! Just a heads up, if you need a solid way to convert your data formats, check this out MarkFlow:https://markdowntoword.pro
Great insights, Csaba! It's impressive to see how the AMR capability enhances voice quality, and I’m particularly intrigued by the potential of CSD for faxing over GSM. Your experience with the OML dialect and its compatibility with older Nokia equipment is valuable. By the way, I recently came across a [small text generator](https://smalltextgenerator.org/) tool that simplifies creating concise summaries of technical discussions like these. It could be useful for anyone looking to distill complex topics into digestible formats.
Great to hear about the improvements with the AMR capability and the successful testing of the FR/EFR parts! It's exciting to see how these advancements can enhance communication systems. Just like organizing a successful project, having the right tools in place—much like using a <a href="https://snapbracket.com/">Bracket Maker</a> for seamless event planning—can make all the difference in achieving great results. Looking forward to hearing more about your CSD trials!
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