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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...

Real-Time Rating and Cost Based Routing in OpenSIPS 3.1
02nd of April 2020 Looking for a quick and easy way of putting a price for a call, without relying on external applications? Here it is! Read more...

BLF reloaded, or a more accurate and detailed approach
02nd of April 2020 The BLF (or dialoginfo) support in OpenSIPS 3.1 is now able to properly handle parallel and serial call forking! Read more...

Enhanced media capabilities in OpenSIPS 3.1 LTS
26th of March 2020 Enhance you SIP proxied calls with complex media capabilities using the new Media Exchange module! Read more...

Quality-Based PSTN Routing in OpenSIPS 3.1 LTS (part 2)
17th of March 2020 A development update on the qrouting module after incorporating feedback and ideas from the community! Read more...

Call control using DTMF in OpenSIPS 3.1 LTS
12nd of March 2020 Check out how you can intercept DTMF codes in OpenSIPS 3.1. Read more...

Quality-Based PSTN Routing in OpenSIPS 3.1 LTS (part 1)
13th of February 2020 Bolster the quality of your outbound PSTN calls by closely monitoring the quality of each of your SIP gateways Read more...

Shaken, not stirred
23th of January 2020 The story and the outcome of the STIR/SHAKEN implementation in OpenSIPS 3.1. Read more...

The OpenSIPS and OpenSSL journey
16th of January 2020 Check out the latest blog post about the latest OpenSSL issues in OpenSIPS 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...

Releases...

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...

Minor release: OpenSIPS 3.0.1
1st of October 2019 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...