osmocom-sdr February 2023

osmocom-sdr@lists.osmocom.org

2 participants
2 discussions

Re: Play RTP packets payload obtained from the mobile phone in a call service
by Tomcsanyi, Domonkos 24 Feb '23

24 Feb '23

AFAIR Wireshark cannot play our RTP streams because it has a very limited set of codecs, mostly focusing on regular VoIP audio. Cheers, Domi > 24.02.2023 dátummal, 1:29 időpontban Neels Hofmeyr <nhofmeyr(a)sysmocom.de> írta: > > On Wed, Feb 22, 2023 at 11:58:24PM +0330, morteza ali Ahmadi wrote: >> I have aggregated all RTP packets payload. How can I convert the aggregated >> bytes to a hearable audio? > > Firstly you need to be aware that 3G audio uses IuUP -- the RTP payload > includes an IuUP header followed by the AMR audio data. To see this in > wireshark, you need to go to Preferences / Protocols / IuUP and mark > [x] Dissect IuUP Payload bits. > > osmo-mgw has implemented the IuUP to AMR conversion: if one side of an MGCP > endpoint has VND.3GPP.IUFP and the other has AMR, osmo-mgw will decapsulate the > AMR from the IuUP, i.e. forward plain AMR. > > Next I guess you will convert the AMR to something you can play back, AFAIK > https://gitea.osmocom.org/osmocom/gapk is capable of that? > > Also wireshark is supposed to be able to play back an RTP stream. See the menu > item Telephony / RTP. It hasn't worked for me yet, not sure what I'm doing > wrong, but I also never tried for more than two minutes. > > This is a rough outline, you'll have to figure out all the details... > > ~N

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OsmoDevCall on Feb 15, 2023: Long range communications in the HF band
by Harald Welte 14 Feb '23

14 Feb '23

Dear Osmocom community, we're happy to announce the next incarnation of OsmoDevCall. when: February 15, 2023 at 20:00 CET where: https://osmocom.org/OsmoDevCall This time, @rafael2kwill be presenting on Long range communications in the HF band This meeting will have the following schedule: 20:00 meet + greet 20:10 presentation as outlined above 21:00 unstructured supplementary social event [*] Attendance is free of charge and open to anyone with an interest in Osmocom or open source cellular technologies. More information about OsmoDevCall, including the schedule for further upcoming events can be found at https://osmocom.org/projects/osmo-dev-con/wiki/OsmoDevCall Looking forward to meeting you soon! Best regards, Harald [*] this is how we started to call the "unstructured" part of osmocom developer conferences in the past, basically where anyone can talk about anything, no formal schedule or structure. -- - Harald Welte <laforge(a)osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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osmocom-sdr February 2023