» OpenSIPS Summit 2026, 28 Apr - 1 May, Bucharest - 07 May 2026 The Summit is over, enriching us with presentations, recording and photos, all gathered for you to review!  » OpenSIPS SBC Community Edition - 06 May 2026 The Open Source SBC turn-key solution covering NAT, mid-register, media handling, topo hiding, carrier support.  » OpenSIPS 4.0 beta release is out - 22 April 2026 The 4.0 version is a turning point in the OpenSIPS evolution, opening the way to radically change and improve legacy concepts and code in OpenSIPS. TLS, TCP, profiling, interop and many more are on the list

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...

Profiling your OpenSIPS 4.0
08th of May 2026 Profiling with OpenSIPS 4.0 or the realtime X-ray of OpenSIPS, to answers to: what my OpenSIPS is doing, why is it slow or why not handling traffic. Read more...

OpenSIPS SBC Community Edition
06th of May 2026 We are proud to announce the latest Community Edition project: the OpenSIPS Session Border Controller. Read more...

TCP/TLS rework in OpenSIPS 4.0
08th of April 2026 OpenSIPS 4.0 brings a full TCP/TLS redesign, from multi-process connection handling to a centralized, multi-threaded I/O model. Read more...

PRACK/UPDATE Interworking in OpenSIPS 4.0
25th of Mar 2026 Bridge IMS and legacy SIP networks using either simple built-in enablement or full scripting control. Read more...

Bond sockets in OpenSIPS 4.0
11st of MArch 2026 The bond sockets make possible the proper selection of the outbound socket based on the last-minute discovered (DNS based) properties of the destination (like protocol or AF)! Read more...

Proxy Protocol support for OpenSIPS 4.0
24th of February 2026 Check out the HAProxy Proxy Protocol implementation in OpenSIPS 4.0 in our latest blog post! Read more...

OpenSIPS Control Panel 9.3.6 has been released!
18th of February 2026 OpenSIPS Control Panel 9.3.6, compatible with OpenSIPS 3.6.x versions has just been released! Read more...

Big scaling SIP forking
17th of Feb 2026 OpenSIPS 4.0 brings dynamic allocation of high number of branches per transaction, without any memory or processing penalties.. Read more...

Releases...

Minor releases: OpenSIPS 3.6.5, 3.4.18
6th of May 2026 A new round of minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.6.4 and 3.4.17
18th of February 2026 Two new minor versions of our stable releases are out! Read more...

Minor releases: OpenSIPS 3.6.3, 3.5.9, 3.4.16
18th of December 2025 A new round of minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.6.2, 3.5.8, 3.4.15
22nd of October 2025 Two new minor versions of our stable releases are out! Read more...

Minor releases: OpenSIPS 3.6.1, 3.5.7, 3.4.14
20th of August 2025 A new round of minor versions for all stable releases. Read more...

Stable release: OpenSIPS 3.6.0
23rd of July 2025 OpenSIPS 3.6 is now stable, as beta testing phase is complete! Read more...

Minor releases: OpenSIPS 3.5.6, 3.4.13
25th of June 2025 We just released two new minor versions, one for each stable OpenSIPS release! Read more...