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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...

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...

OpenSIPIt 01 – Testing the Trending SIP Security Enhancements
20th of Apr 2021 Summary of the event, along with the status quo regarding the new SIP "Security RFCs". Read more...

Tips & Tricks for Advanced SIP Capturing
15th of Apr 2021 The 3.2 OpenSIPS is addressing new SIP capturing challenges: multi-call correlation, SIP server chaining, B2B-wise tracing.! Read more...

Releases...

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...

Minor releases: OpenSIPS 3.1.2 and 2.4.10
6th of May 2021 Two new minor versions of our stable LTS releases are out! Read more...

Final release: OpenSIPS 3.0.5
22nd of December 2020 The last release of the OpenSIPS 3.0 version is now available to download! Read more...

Minor releases: OpenSIPS 3.1.1, 3.0.4 and 2.4.9
17th of November 2020 Three new minor releases are available for all supported OpenSIPS Branches! Read more...