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~

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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.

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!

Sounds like you’re on the right track with that AMR setup! It's great to see some practical applications. By the way, if you're looking for pain management solutions while you're testing all this gear, check out this https://mrjointpatch.com.

Hi Csaba, Thanks for the detailed update — really helpful to hear real-world feedback on the AMR and FR/EFR testing. The fax-over-GSM idea is genuinely exciting, especially for museum preservation purposes! On a slightly different note, while we're all here tinkering with legacy telecom hardware and squeezing every bit of utility out of old systems, I've been applying that same "get the most out of what you have" mindset to everyday life tools as well. For instance, when budgeting for lab equipment and parts, a markup calculator at https://markupcalculator.org/ helps me figure out fair pricing when selling surplus gear. When writing up technical documentation, I rely on a line counter at https://linecounter.org/ to keep things concise. For team lunches after a long lab session, a tip calculator at https://tipcalculators.org/ keeps things fair. When reviewing signal threshold math, an inequality calculator at https://inequalitycalculator.net/ comes in handy. For antenna mounting geometry, a Pythagorean theorem calculator at https://pythagoreantheoremcalculator.pro/ saves a lot of manual work. When preparing diagrams and schematics for documentation, an aspect ratio calculator at https://aspectratiocalculator.pro/ keeps everything properly proportioned. Just for fun, I checked my moon sign at https://moonsigncalculators.com/ — apparently I'm a natural problem solver, which tracks! And my dog has been keeping me company through all these late-night testing sessions — https://dogcalculator.net/ helped me make sure he's staying healthy too. Looking forward to hearing how the UltraSite CSD tests go next year! Best regards