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OpenSIPS is an Open Source SIP proxy/server for voice, video, IM, presence and any other SIP extensions.

OpenSIPS is a multi-functional, multi-purpose signaling SIP server used by carriers, telecoms or ITSPs for solutions like Class4/5 Residential Platforms, Trunking / Wholesale, Enterprise / Virtual PBX Solutions, Session Border Controllers, Application Servers, Front-End Load Balancers, IMS Platforms, Call Centers, and many others - see the full Set of Features.

OpenSIPS is recommended for any kind of SIP scenario / service by:

• the high throughput - tens of thousands of CPS, millions of ‏simultaneous calls (see official tests)
• the flexibility of routing and integration - routing script for implementing custom routing logics, several interfacing APIs (see the Manual)
• the effective application building - more than 120 modules to provide features, for SIP handling, for backend operations, for integration, for routing logics (see List of Modules)

Latest News...

The Module Function Interface Rework in OpenSIPS 3.0
5th of November 2019 OpenSIPS 3.0 ships with a more polished opensips.cfg syntax! Read more...

OpenSIPS as SBC for MS Teams
16th of September 2019 How to configure OpenSIPS as SBC for terminating external calls for an MS Teams tenant! Read more...

No more downtime after OpenSIPS 3.0 restarts
4th of April 2019 Check out how the new restart persistence feature can improve the time OpenSIPS 3.0 re-caches its data after a restart! Read more...

Containing Memory-Related Issues in an Easy Way With OpenSIPS 3.0
21st of March 2019 Troubleshooting bugs and writing code will be a lot more fun with OpenSIPS 3.0! Read more...

New OpenSIPS CLI tool for managing OpenSIPS 3.0
13th of March 2019 A new interactive command line tool has been developed for the new OpenSIPS 3.0 MI interface! Read more...

Service redundancy in two steps with unified clustering in OpenSIPS 3.0
07th of March 2019 Redundancy means implementing an active – backup setup with full realtime synchronization and management between the two! Read more...

Generic Preprocessing Support in OpenSIPS 3.0
05th of March 2019 Everything about the preprocessing support included in the upcoming 3.0 release. Read more...

Auto process scaling with OpenSIPS 3.0
25th of February 2019 A smart and easy to use feature that simply absolve you from any worries or concerns about proper scaling of your OpenSIPS! Read more...

Releases...

Minor release: OpenSIPS 3.0.1
1st of October 2018 The first minor release of OpenSIPS 3.0 branch consists of important bug fixes! Read more...

Minor release: OpenSIPS 2.4.6
11th of June 2019 Latest bug fixes for the OpenSIPS 2.4 LTS versions have been released! Read more...

Final release: OpenSIPS 2.2.8
11th of June 2019 The last version of OpenSIPS 2.2.8 has been released! Read more...

Stable release: OpenSIPS 3.0.0
29th of May 2019 Check out the newest major stable release, the OpenSIPS 3.0.0! Read more...

Beta release: OpenSIPS 3.0.0
16th of April 2019 Check out the latest beta release of the new OpenSIPS 3.0.0! Read more...

Minor release: OpenSIPS 2.4.5
7th of March 2019 The latest OpenSIPS 2.4 release is now available! Read more...

Minor release: OpenSIPS 2.4.4
8th of November 2018 This year's holidays come with a new OpenSIPS 2.4 branch release that contains a lot of bug fixes! Read more...