Osmocom's Serving Mobile Location Centre https://osmocom.org/projects/osmo-smlc
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osmo-smlc - Osmocom Serving Mobile Location Centre

This repository contains a C-language implementation of a minimalistic GSM Serving Mobile Location Centre (SMLC) for 2G (GSM). It is part of the Osmocom Open Source Mobile Communications project.

OsmoSMLC exposes

  • 3GPP Lb interface towards the BSC
  • The Osmocom typical telnet VTY and CTRL interfaces.
  • The Osmocom typical statsd exporter.

OsmoSMLC supports the following location methods:

  • currently only the Timing Advance based method of determining a mobile station; operator must configure the locations of the cells in the osmo-smlc configuration file


You can find the OsmoSMLC issue tracker and wiki online at https://osmocom.org/projects/osmo-smlc and https://osmocom.org/projects/osmo-smlc/wiki

GIT Repository

You can clone from the official osmo-smlc.git repository using

    git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-smlc

There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-smlc


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 Manual

Mailing List

Discussions related to osmo-smlc are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.


Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for osmo-smlc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-smlc+status:open