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2023-02-01: DATEX-L, the German CSPDN

Added by laforge 17 days ago

We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall

This time, laforge will be presenting on DATEX-L, the German circuit-switched public data network which existed from 1967 (!) onwards.

For more background see CSPDN__Datex-L.

Topics include (not limited to)
  • timeline / history
  • network architecture
  • applications

When: Wednesday, February 1, 2023 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 Datex-L, the German CSPDN laforge
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)

2022-12-07: RetroNetCall on ISDN B channel protocols

Added by laforge 2 months ago

We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall

This time, laforge will be presenting on ISDN B-channel protocols: V.110, V.120, X.75, H.221

Topics include (not limited to)
  • description of the respective protocol
  • look at a protocol trace
  • status of open source implementations

When: Wednesday, December 7, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 ISDN B-channel protocols laforge
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)

2022-11-09: RetroNetCall with OCTOI project status update

Added by laforge 3 months ago

We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall

This time, laforge will be presenting a General status update on OCTOI (Osmocom Community TDMoIP)

Topics include (not limited to)
  • migation to co-located hub now fully completed
  • osmo-e1d status update
  • the new osmo-isdntap project for tracing/recording D and B channel data
  • Some initial research into H.221 / dissecting video calls
  • OCTOI BERT problems
  • 4x new Octoi_Event_PBX for rapid deployment of ISDN+POTS at various events
  • yate troubles regarding missing call.answer when using record/playback
  • resuming work on the BRI interface

When: Wednesday, November 9, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 OCTOI Project Status Update laforge
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting5.franken.de/b/har-0y1-wch-et4 (Big Blue Button of https://franken.de/)

isdn4linux historical CVS archive

Added by laforge 10 months ago

Thanks to Fritz Elfert, we were able to acquire a full CVS backup of the no-longer-accessible CVS server cvs.isdn4linux.de.

We manually created mapping tables for CVS user names to real names / e-mail addresses and used cvs2git to import those into git repositories for contemporary viewing, analysis and long-term archieval.

The results can be found in our gitea, individual repositories linked below:

In case you're interested in the above, you might also be interested in our previous re-construction of the u-isdn history

New Retronetworking Project: Software-Defined Uk0

Added by laforge 10 months ago

Osmocom developer jolly has started a new project for implementing the central-office side of the ISDN U (Uk0 in Germany) interface using a sound card with 192kHz samplerate.

Using this setup, you can connect an ISDN NT for BRI (NTBA in Germany) to your sound card, and provide ISDN services via mISDN.

Some basic information about a first proof-of-concept can be found at Software_Defined_Uk0; stay tuned for more information.

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There is no real documentation yet on how to reproduce this, but code can be found at https://gitea.osmocom.org/retronetworking/uk0 (SDR PHY for Uk0) and https://gitea.osmocom.org/cc/osmo-cc-misdn-endpoint/src/branch/jolly/uk0 (mISDN port to make use of the former).

German Historical FTZ Standards for ISDN, SS7 and more

Added by laforge about 1 year ago

A number of previously unavailable historical German national standards related to (mainly) ISDN have been uncovered and are now availale as PDFs from https://people.osmocom.org/laforge/ftz/ (and in more structured presentation with metadata at German_FTZ_ISDN_Specifications).

The standards include, among many others
  • 1TR6 - German National ISDN variant of the 1980ies, before Euro-ISDN was introduced in the 1990ies
  • 1TR7 - German National SS7 dialect
  • various physical layer specs for interfaces such as S2M, V2M, Uk0, Uk2, UG2 and more
    (1-7/7)

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