SCCP + SIGTRAN (SUA/M3UA) libraries as well as OsmoSTP
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Pau Espin da7bc78cb4 ss7_asp: Update osmo_stream read_cb2 functions to accommodate for new API param
libosmo-netif (not yet released) stream_{cli,srv} osmo_io read_cb API was
updated to provide read result status. Hence, now API users (ss7_asp)
can account for lower layer errors and act properly, like it used to
do with the previous ofd backend.

This commit partially reverts some error code paths removed in
9257cd896e when converting code to use
osmo_io osmo_stream backend.

Change-Id: I579f4101a9e2874e310ff78e4571f38cfe8dfab0
Depends: libosmo-netif.git Change-Id I395c75ff1e9904757ce1d767a9ac2f779593c4c8
2024-04-17 16:31:45 +02:00
.github Add funding link to github mirror 2024-03-23 13:21:28 +01:00
contrib Bump version: → 1.8.0 2023-09-12 14:03:25 +02:00
debian Bump version: → 1.8.0 2023-09-12 14:03:25 +02:00
doc manuals: generate vty reference xml at build time 2021-02-23 17:20:08 +01:00
examples examples/sccp_demo_user: fix default ASP protocol in help 2024-02-19 21:18:39 +00:00
include VTY: rename 'sctp-role' to 'transport-role', add an alias 2024-02-27 00:45:56 +07:00
specs add RFC 3868 (SUA) spec in HTML 2017-01-27 09:59:30 +01:00
src ss7_asp: Update osmo_stream read_cb2 functions to accommodate for new API param 2024-04-17 16:31:45 +02:00
stp ipa: Use pseudo-random number for SLS in IPA->M3UA direction 2024-03-30 10:48:50 +00:00
tests fix regression in sctp-role / transport-role 2024-02-29 17:20:41 +07:00
.gitignore .gitignore: Ignore *.pyc 2023-06-08 13:57:01 +02:00
.gitreview Add gerrit settings 2016-12-21 13:46:12 +01:00
COPYING move openbsc into its own subdirectory 2009-06-10 05:40:52 +08:00 Doxugen: s/libosmo-sccp/libosmo-sigtran/g 2017-10-27 21:10:18 +02:00 build: include into the release tarball 2024-01-26 23:27:59 +07:00 Add links to forum and issue tracker 2024-03-23 13:28:43 +01:00
TODO-RELEASE xua + ipa: Add support for I/O in OSMO_IO mode 2024-03-13 22:18:36 +01:00 Bump version: → 1.8.0 2023-09-12 14:03:25 +02:00
git-version-gen git-version-gen: Don't check for .git directory 2018-07-24 18:03:20 +02:00 Revert "Fix the .pc files so the -l arg matches the installed libraries" 2016-11-03 13:04:34 +00:00 Revert "Fix the .pc files so the -l arg matches the installed libraries" 2016-11-03 13:04:34 +00:00 libosmo-sigtran: Add pkg-config integration 2015-12-22 23:03:44 +01:00 Add missing xua.pc file 2016-11-03 12:36:41 +00:00 also test doc/examples/osmo-stp-multihome.cfg 2023-03-30 02:36:26 +07:00

libosmo-sccp - Osmocom SCCP, SIGTRAN and STP

This repository contains

  • libosmo-sigtran, a C-language library implementation of a variety of telecom signaling protocols, such as M3UA, SUA, SCCP (connection oriented and connectionless)
  • OsmoSTP, a SS7 Transfer Point that can be used to act as router and translator between M3UA, SUA and/or SCCPlite
  • libosmo-sccp, a legacy C-language [static] library that we used in prehistoric osmocom code before we had libosmo-sigtran.


The official homepage of libosmo-sccp is at

The official homepage of osmo-stp is at

GIT Repository

You can clone from the official git repository using

git clone

There is a web interface at


osmo-stp User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.

Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY reference manuals


We welcome any libosmo-sigtran + osmo-stp related discussions in the Cellular Network Infrastructure -> 2G/3G Core Network section of the osmocom discourse (web based Forum).

Mailing List

Discussions related to osmo-stp are happening on the mailing list, please see for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

Issue Tracker

We use the issue trackers of for tracking the state of bug reports and feature requests. Feel free to submit any issues you may find, or help us out by resolving existing issues.


Our coding standards are described at

We us a gerrit based patch submission/review process for managing contributions. Please see for more details

The current patch queue can be seen at