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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...

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...

Apache Kafka Producer in OpenSIPS 3.2
4th of Mar 2021 The Kafka support was added together with async sending and reporting support, even when using event_virtual! Read more...

NEW Prometheus Module in OpenSIPS 3.2
25th of Feb 2021 Find out how you can monitor OpenSIPS with Prometheus and plot its statistics in Grafana! Read more...

Exploring SSL/TLS libraries for OpenSIPS 3.2
11th of Feb 2021 What are the SSL/TLS library candidates for OpenSIPS, now that OpenSSL proofed to be a no-go for the future! Read more...

Improved series-based call statistics using OpenSIPS 3.2
02nd of Feb 2021 How to build custom time series statistics (like ACD, AST, PPT, ASR, NER, CCR) directly from OpenSIPS script! Read more...

Releases...

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...

Stable release: OpenSIPS 3.1.0
22nd of July 2020 OpenSIPS 3.1.0 stable LTS is now released! Read more...

Beta release: OpenSIPS 3.1.0
27th of May 2020 Check out the latest beta release of the new OpenSIPS 3.1.0! Read more...

Minor release: OpenSIPS 2.4.7 and 3.0.2
28th of January 2020 The new year has come with two new OpenSIPS minor releases: 2.4.7 and 3.0.2! Read more...