Osmocom HLR for GSUP protocol towards OsmoSGSN and OsmoMSC https://osmocom.org/projects/osmo-hlr
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mslookup: Call osmo_fd_unregister() before closing and changing bfd->fd
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osmo-hlr - Osmocom HLR Implementation

This repository contains a C-language implementation of a GSM Home Location Register (HLR). It is part of the Osmocom Open Source Mobile Communications project.

Warning: While the HLR logical functionality is implemented, OsmoHLR does not use the ETSI/3GPP TCAP/MAP protocol stack. Instead, a much simpler custom protocol (GSUP) is used. This means, OsmoHLR is of no use outside the context of an Osmocom core network. You can use it with OsmoMSC, OsmoSGSN etc. - but not with third party components.


The official homepage of the project is https://osmocom.org/projects/osmo-hlr/wiki

GIT Repository

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

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

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


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

Mailing List

Discussions related to osmo-hlr 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-hlr can be seen at https://gerrit.osmocom.org/#/q/project:osmo-hlr+status:open