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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)

OpenSIPS 3.2 release was subject of a security audit, making everything safer and more secure for everybody.

Latest News...

OpenSIPS Control Panel 9.3.4 has been released
9th of November 2023 OpenSIPS Control Panel 9.3.4 corresponding to the latest OpenSIPS 3.4.x version is now released Read more...

Our Participation in the OpenSIPIt'03 online testing event!
5th of October 2023 A few words about how the event unfolded and what we got out of it. Read more...

Troubleshooting one way audio calls
06th of July 2023 We all faced the "One way audio" problem, but troubleshooting it was not always a clear path, as the causes were not fully understood all the time. Read more...

Smart Logging with OpenSIPS 3.4
14th of June 2023 The 3.4 comes with multiple formats for the logs and also with the ability to send logs to multiple destinations. Read more...

SIPssert and the journey of testing OpenSIPS
27th of April 2023 Check out how OpenSIPS is already benefiting from the SIPssert testing framework Read more...

SIPssert – an OpenSIPS Testing Framework
04th of April 2023 Test OpenSIPS code or SIP platform by writing your own tests with custom SIP flows and DB / MI / API interactions. Read more...

B2BUA Bridging Improvements In OpenSIPS 3.4
23rf of March 2023 The re-bridging mechanism of the B2B was reworked to make it more reliable, easier to interop and with on-hold & failover support. Read more...

API driven SIP User-Agent end-point with OpenSIPS 3.4
22nd of March 2023 OpenSIPS as a mixed back-to-back, with a SIP User-Agent on one side and a custom logic on the other side, API controlling what how the SIP side should behave. Read more...

Releases...

Minor releases: OpenSIPS 3.4.2, 3.3.8, 3.2.15
18th of October 2023 New minor versions for all stable releases! Read more...

Minor releases: OpenSIPS 3.4.1, 3.3.7, 3.2.14, 3.1.17
31st of August 2023 Four new minor versions of our stable releases are out! Read more...

OpenSIPS 3.1 End of support!
31st of August 2023 OpenSIPS 3.1.x branch is no longer supported, with the 3.1.17 version being the last release of the stable branch! Read more...

Announcing: OpenSIPS 3.4 LTS stable!
19th of July 2023 OpenSIPS 3.4.0-rc1 now promotes to 3.4.0 stable, which will be supported for the next 3 years! Read more...

Minor releases: OpenSIPS 3.3.6, 3.2.13 and 3.1.16
21st of June 2023 Three new minor versions for the currently supported OpenSIPS stable releases are out! Read more...

OpenSIPS 3.4.0-rc1
20th of June 2023 A first release candidate for 3.4 is now available! Read more...

Minor releases: OpenSIPS 3.3.5, 3.2.12 and 3.1.15
19th of April 2023 New stable releases for each major branch, packing important fixes Read more...