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OpenSIPS

OpenSIPS/opensips

OpenSIPS is a GPL-licensed, multi-functionality SIP server for building professional VoIP and telephony platforms.

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What is it?

OpenSIPS is a SIP server implementation released under the GPL. It began as a fork of the Fraunhofer SIP Express Router (SER) project and is maintained by a team that includes core developers of SER, with an emphasis on open project management and external contributions.

The project aims to deliver a high-level technical solution for professional SIP server platforms, covering performance, security and call quality. It is organized as a set of modules, and the project publishes a modules listing and per-module documentation on its website.

The repository contains the server source code in C, along with build and install instructions, and a continuous integration setup that includes unit tests, fuzzing and cross-platform builds.

Key features

  • 01Multi-functionality SIP server built from modules
  • 02Written in C and released under the GPL
  • 03Focuses on performance, security and call quality
  • 04Includes unit tests, fuzzing and cross-platform build workflows

Use cases

  • Building a carrier-grade or enterprise SIP routing platform
  • Running a VoIP service that needs customizable call routing via modules
  • Operating a SIP infrastructure component that must be audited or modified under the GPL

Quick start

  1. 1

    Read the INSTALL file for installation instructions

Things to know

  • The README gives no install commands and points to the separate INSTALL file.
  • The license metadata is unrecognized, so check the COPYING file for the actual GPL terms.

Topics

#sip#voip#telephony#real-time-communication#server

FAQ

What is opensips?
OpenSIPS is a GPL-licensed, multi-functionality SIP server for building professional VoIP and telephony platforms. OpenSIPS is a SIP server implementation released under the GPL. It began as a fork of the Fraunhofer SIP Express Router (SER) project and is maintained by a team that includes core developers of SER, with an emphasis on open project management and external contributions.
Is opensips free to use? What license does it have?
opensips is open source under the Other license. Check the license terms before using it in commercial products.
Is opensips still maintained?
Actively maintained. The last commit to opensips was on Nov 6, 2026.
What can I use opensips for?
Building a carrier-grade or enterprise SIP routing platform Running a VoIP service that needs customizable call routing via modules Operating a SIP infrastructure component that must be audited or modified under the GPL
How do I install opensips?
Read the INSTALL file for installation instructions
Where can I get opensips?
The source code and installation instructions are on GitHub: https://github.com/OpenSIPS/opensips

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