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OpenSIPS project preview
BusinessAlternative to TwilioAlternative to KamailioAlternative to Cisco SBC

OpenSIPS

Multi-functional, multi-purpose Open Source SIP server and carrier-grade VoIP proxy.

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LicenseGPL-2.0
GitHub stars1.8k
Last commit1 weeks ago
Tags5 topics
Sip Server ProxyOpensips TelecomDevopsCarrier Grade VoipSession Border Controller
Overview

Why consider OpenSIPS?

OpenSIPS is an open-source, carrier-grade SIP server implementation written in C by the OpenSIPS project. OpenSIPS acts as a SIP proxy, session border controller (SBC), registrar, and load balancer, routing millions of voice and video calls for telecom providers with microsecond latency.

Guided learning

Learn OpenSIPS by building

Practical setup notes, real use cases, and copy-ready examples in one focused guide.

1 min read 2 sections
In this guide2 sections

Overview of OpenSIPS

OpenSIPS routes carrier VoIP sessions and load-balances voice RTP media streams.

Quickstart

bash
1git clone https://github.com/OpenSIPS/opensips.git -b 3.4 opensips-3.4
2cd opensips-3.4 && make all && sudo make install

OpenSIPS is licensed under the GNU General Public License v2.0 (GPL-2.0).

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OpenSIPS FAQs

OpenSIPS is listed as a Business tool on TiloBox. Review the overview, features, and official documentation on this page to decide whether it solves your specific workflow.

Start with the project's GitHub repository and official website for supported installation and deployment instructions. Test the setup with representative data or a small project before rolling it out more widely.

OpenSIPS is listed under the GPL-2.0 license. Read the complete license text and the project's notices before using, modifying, or distributing the software.

Production readiness depends on your requirements. Review maintenance activity, security practices, documentation, backup and upgrade procedures, and compatibility with your stack; then validate it in a non-production environment.

OpenSIPS is listed as an alternative to Twilio. Compare the core workflow, deployment model, integrations, and licensing against your must-have requirements before switching.