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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...

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...

The MSRP eco-system in OpenSIPS 3.3
30th of May 2022 As OpenSIPS 3.3 focused on messaging, mainly on MSRP / session based messaging, here is a detailed walk thru the entire MSRP stack in OpenSIPS 3.3 and its capabilities, from relaying, to APIs and gatewaying! Read more...

OpenSIPS Security Audit - mission accomplished
28th of April 2022 A lot of fuzzing, testing and of course fixing. Everything just to make OpenSIPS more secure! Read more...

Releases...

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...

Beta release: OpenSIPS 3.3.0-beta
18th of May 2022 OpenSIPS 3.3 just got beta released! Read more...