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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...

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...

How to Generate Your Own STIR/SHAKEN Certs
31st of October 2022 Become your own STIR/SHAKEN CA and generate as many free SP certificates as you want! Read more...

The MSRP gateway
9th of June 2022 OpenSIPS 3.3 can bridge the two Instant Messaging worlds: the simple SIP MESSAGE world (page mode) and the complex MSRP world (session mode) ! Read more...

OpenSIPS Contact Center, or blending chats and calls
8th of June 2022 Understand in details the new chat/MSRP support in the Call Center module, OpenSIPS 3.3 , how it works and how to use it.! Read more...

Using the Diameter Client Capability of OpenSIPS 3.3
2nd of June 2022 The ability to build & send arbitrary Diameter requests from script is finally here! Read more...

Releases...

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...

Minor releases: OpenSIPS 3.3.4, 3.2.11 and 3.1.14
22nd of February 2023 Three new minor versions of our stable releases are out! Read more...

Minor releases: OpenSIPS 3.3.3, 3.2.10 and 3.1.13
20th of December 2022 A stable non-LTS 3.3 minor release, along with two new minor versions of our stable LTS 3.2 and 3.1 are out! Read more...

Minor releases: OpenSIPS 3.3.2, 3.2.9, 3.1.12
19th of October 2022 Three new minor versions of our stable LTS releases are out! Read more...

Minor releases: OpenSIPS 3.3.1, 3.2.8, 3.1.11
17th of August 2022 A new set of minor releases is now available for all supported OpenSIPS branches! Read more...

Stable releases: OpenSIPS 3.3.0
19th of August 2021 The first stable release of the new OpenSIPS 3.3 is available to use! Read more...

Releases: OpenSIPS 3.3.0-rc1, 3.2.7 and 3.1.10
22nd of June 2022 A first release candidate for 3.3 is now available, along with two new stable minors! Read more...