December 2025 - osmocom-analog

Osmocom analog RX overflow
by plaskg.90＠gmail.com 18 Mar '26

18 Mar '26

Hello all, I have finally given my wired 1g base station setup a try, and it works! (Sort of) To start with, I got these two message spammed on my screen: DSDR ERROR sdr.c:985 SDR RX overflow! And: DSOAPY ERROR soapy.c:573 SDR TX underrun, seems we are too slow. Use lower SDR sample rate. After a while of tinkering, I managed to get the Sample rate down to 96000, this works a lot better (the phone can now connect (sometimes) and receive/place calls). I can’t seem to get either the audio sample rate or the SDR sample rate any lower. (Although I am still very new to RF and probably missed something!) There are still problems, as I am still getting these 2 errors quite frequently and it causes the phone to not connect properly. My setup is: Windows 11 computer running Ubuntu in an emulator with usb pass though (would running it natively be better as the pass through doesn’t work very well?) LimeSDR mini 2.0 Motorola 4800x The terminal command is: tacs -k 23 -k 24 —limesdr-mini -P 6 -s 96000 —sdr-samplerate 96000 Any help at all much appreciated.

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No Device for Transceiver
by carsten.gallini＠gmail.com 14 Mar '26

14 Mar '26

https://pasteboard.co/dkAOhAMS7qOh.png https://pasteboard.co/V7C90XoOSC5n.png UHD is able to find the device and set the name so I do have control over the device, I'm not sure what the deal is.

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Re: SIP connector for osmocom-analog?
by jordan＠k9fax.us 14 Mar '26

14 Mar '26

On 2023-02-23 03:34, Famicoman wrote: > Hi all, thanks for all your help so far! > > I believe I have successfully built sofia-sip and > osmo-cc-sip-endpoint. I did have an issue building > osmo-cc-sip-endpoint as it was complaining about using > AC_CONFIG_MACRO_DIR more than once in configure.ac [1] when running > autoreconf. I saw that it was defining both AC_CONFIG_MACRO_DIR and > AC_CONFIG_MACRO_DIRS so I commented out the latter and everything > seems to have proceeded fine afterwards (though with warnings). I'm > leaving this note here in case someone else faces this. I'm running > Ubuntu 22.04.2 with everything up to date so I'm guessing the build > dependencies have become more strict towards this. > > I am running amps with: > $ amps --limesdr-mini --channel 334 - channel 332 -o --fast-math > > I am running osmo-cc-sip-endpoint with: > $ osmo-cc-sip-endpoint --local 192.168.3.225 --remote 192.168.5.228 -R > 8927188(a)192.168.5.228 -A 8927188 secretpasswordhere 192.168.5.228 -v 0 > * > > osmo-cc-sip-endpoint connects to my asterisk server at 192.168.5.228 > just fine and it also reports it is connecting to my local ip via the > socket amps sets up. The issue I'm facing at the moment is that I'm > not getting audio from asterisk coming out of the earpiece on the amps > phone. I do hear a bit of white noise and an occasional click > (interference I'm guessing) and I know the phone is otherwise good > because I used it to call another phone through amps. Based on the > asterisk logs, everything looks as it would for any other hardline I > have connected but I'm not hearing anything. > > I'll do some more checks later to make sure asterisk is behaving > properly and I'll try to call my amps phone from a hardline and see if > there's some sort of one-way audio issue. > > Does anyone know if osmo-cc-sip-endpoint needs a specific audio codec? > I'm only allowing ulaw right now, though I also tried with both ulaw > and alaw enabled and noticed no difference. > > To answer Jordan's question about how I compiled the > osmocom-analog-binaries, these are the steps I used: > $ autoreconf -if > $ ./configure > $ make -j4 > $ sudo make install > > I think I'm really close, just not 100% there yet. > > Cheers, > Mike > > On Wed, Feb 22, 2023 at 3:42 AM <jordan(a)k9fax.us> wrote: > >> On 2023-02-20 21:42, Famicoman wrote: >>> Hello all! I have been enjoying osmocom-analog with my AMPS phones >> for >>> the last few days and was wondering if there has been any work >> done >>> for SIP connectivity with analog phones? I see there is >>> 'osmo-sip-connector' software from my searches but as far as I can >>> tell, there is no similar software of osmocom-analog. >>> >>> Thanks, >>> Mike >>> -- >>> osmocom-analog mailing list -- osmocom-analog(a)lists.osmocom.org >>> To unsubscribe send an email to >> osmocom-analog-leave(a)lists.osmocom.org >> >> That connector does indeed work with Osmocom-analog, it can be a bit >> >> tricky with the lack of documentation however, I have navigated it >> before and would be happy to lend a hand. Can you tell me about how >> you >> compiled your osmocom-analog binaries (what options and such used)? > > > Links: > ------ > [1] http://configure.ac Glad to hear you are getting there! What codec is your asterisk server set to use? You may need to play with the allowed codecs on that end. I remember running into that issue before as well however I do not remember how I went about resolving it. I will be able to play around with my setup again later this weekend and I can let you know how I had mine configured. You may want to ensure under your Asterisk SIP Settings tab that you have ulaw, alaw, and gsm codecs enabled/allowed to start with. You may also be able to specify the codec in the sip connector parameters. The last thing I can think to mention is to ensure your SIP traffic is flowing freely to both ends, SIP through firewalls can be a huge pain in the rear end.

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Re: Fwd: osmocom-analog Website down?
by Andreas Eversberg 14 Mar '26

14 Mar '26

Please try again. I just fixed some entries in the DNS. It should work with IPv6/IPv4 now. On 6/21/24 06:56, Harald Welte wrote: > > > -------- Original Message -------- > From: Tyler Bufkin <wz5tx(a)outlook.com> > Sent: 21 June 2024 04:04:46 CEST > To: "osmocom-analog-owner(a)lists.osmocom.org" <osmocom-analog-owner(a)lists.osmocom.org> > Subject: Website down? > > Hello, > I was just trying to pull up your website and I can't seem to get it to load. > I am wanting to get my analog cellular project up and going. > Thanks! > > WZ5TX > David “Tyler” Bufkin > 817-846-4693 >

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osmocom-analog to osmo-cc-sip-endpoint local server help
by admin＠ready100.com 14 Mar '26

14 Mar '26

osmocom-analog is working. osmo-cc-sip-endpoint is installed and working (i think) however, i'm not sure what my sip-endpoint command line should be... Everything is running on the same machine, I just want to connect my AMPS device to my local asterisk server. I have setup a user for the pbx using the phone number baked into the phone. I have a non standard port (ie not default) for my asterisk server. When I try to use command lines I've seen on the lists I just get: sip.c:1783 error : Failed to create SIP stack object I assume it's just because I have incomplete parameters. Can anyone help? I'm so close!

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SIP connector for osmocom-analog?
by Famicoman 14 Mar '26

14 Mar '26

Hello all! I have been enjoying osmocom-analog with my AMPS phones for the last few days and was wondering if there has been any work done for SIP connectivity with analog phones? I see there is 'osmo-sip-connector' software from my searches but as far as I can tell, there is no similar software of osmocom-analog. Thanks, Mike

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Help with cable connection from the phone to the SDR.
by George 11 Mar '26

11 Mar '26

Hello, I have been wanting to build a TACS base station with Osmocom analog for a while now, and have decided finally to do it! To avoid regulations, I would like to do it over a cabled connection from the phone to the SDR. I have read that some form of load or attenuators are needed to stop the phone and SDR frying themselves. Unfortunately I have little knowledge on this subject, so I wondered if anyone here can tell be what sort of load I need. Any help would be greatly appreciated

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Future Directions in Nursing Education and Paper Writing Services
by taylorswiftmerch146＠gmail.com 03 Mar '26

03 Mar '26

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SDR reccomendation
by nishackle＠gmail.com 24 Dec '25

24 Dec '25

Hi All, I hate reaching out like this, but I'm at the limit of my knowledge. I've got some AMPS handsets i'd like to make use of-back to my PBX if possible. The problem is, i've not been able to get AMPS to work with any of the SDR's I have. I have a HackRF, A URAN1 and a Pluto. I can open the URAN as a USRP device with the following: amps --sdr-soapy \ --sdr-device-args "driver=uhd" \ --sdr-channel 0 \ --sdr-samplerate 1000000 \ --sdr-bandwidth 250000 \ --sdr-rx-gain 20 \ --sdr-tx-gain 30.0 \ -k 334 -T CC/PC/VC \ -k 336 -T VC \ -p -s 192000 -o --fast-math Which appears to work, but the radio doesn't ever actually transmit, the SDR works, because I use it with OpenBTS to make a GSM station. I spent a $400 on a secondhand limeSDR mini, but that turned up broken in the post. Is there an easily obtainable SDR that anyone else has got working? Thanks, Nick

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osmocom-analog December 2025