» OpenSIPS 3.3 Planning - 23 Dec 2021 Checkout the roadmap of OpenSIPS 3.3 major release and how this fits into the IMS and Unified Communications ecosystems.  » OpenSIPS 3.2.0 released - 21 Jul 2021 OpenSIPS 3.2 major version goes 3.2.0 stable, with Clustering, Security, Cloud/Integration and Diameter support.

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 OpenSIPS Security Audit is happening
20th of January 2022 Find out the OpenSIPS 3.3's vision on Instant Messaging in the IMS and Unified Communications ecosystems - it's definitely a problem solver! Read more...

The OpenSIPS Security Audit is happening
30th of September 2021 The security audit has already started, EnableSecurity is doing a fantastic job in terms of torturing OpenSIPS 3.2! Read more...

Running MI commands from script with OpenSIPS 3.2
30th of June 2021 Check out the pros and cons running MI commands from script using the latest OpenSIPS 3.2! Read more...

NEW Diameter Protocol Support in OpenSIPS 3.2
17th of June 2021 Get a picture for how Diameter and the freeDiameter project fit into OpenSIPS 3.2 and what we built on top! Read more...

Media high availability/re-anchoring using OpenSIPS 3.2
09th of June 2021 Find out how you can achieve media high availability using any media relay server you are using by re-anchoring ongoing calls' media to a different relay node. Read more...

OpenSIPS 3.2 and the supported SSL/TLS libraries
3rd of Jun 2021 How easy is to switch between wolfSSL and openSSL libraries when using the TLS support in OpenSIPS 3.2 ? Find the answer. Read more...

Clustering Engine Improvements in OpenSIPS 3.2
22th of Apr 2021 The SIP clustering support in OpenSIPS keeps evolving, for better scalability and redundancy solutions. Read more...

Releases...

Minor releases: OpenSIPS 3.2.4 and 3.1.7
22nd of December 2021 Two new minor versions of our stable LTS releases are out! Read more...

Minor releases: OpenSIPS 3.2.3 and 3.1.6
20th of October 2021 Two new minor releases are available for all supported OpenSIPS branches! Read more...

Minor releases: OpenSIPS 3.2.2 and 3.1.5
19th of August 2021 Two new minor releases are available for all supported OpenSIPS branches! Read more...

Final release: OpenSIPS 2.4.11
22nd of June 2021 OpenSIPS 2.4 LTS has come to its final minor release, the 11th of its kind! Read more...

Minor release: OpenSIPS 3.1.3
22nd of June 2020 The third minor release of our OpenSIPS 3.1.3 (LTS) is now available! Read more...

Beta release: OpenSIPS 3.2.0
27th of May 2021 Check out the latest beta release of the new OpenSIPS 3.2.0! Read more...