» OpenSIPS Control Panel 8.3.1 Released - 12 Jan 2021 The provisioning web interface matching OpenSIPS 3.1 is now ready to use!  » OpenSIPS 3.2 Planning - 23 Dec 2020 The plan for the next 3.2 major release is here, so check its philosophy and features!  » OpenSIPS 3.1 is out - 22th of July 2020 Let's welcome the 3.1 LTS stable release, focused on complex call crafting. Learn how you can do Call API, inter-call media exchange, Push Notification, STIR/SHAKEN and many others Class 5 adds-on.

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...

Script driven SIP BAck-2-Back with OpenSIPs 3.2
07th of Jan 2021 The B2B support in OpenSIPS just got more powerful and simpler the use by migrating from XML to OpenSIPS routing script! Read more...

OpenSIPS Summit Distributed 2020- Speakers and Moderators
06th of Aug 2020 Some useful insights about the OpenSIPS Summit Distributed 2020 new format and new ideology ! Read more...

Call API first version has been released
11th of Jun 2020 The first version of the new Call API has been released. Check out how simple it is to control your calls through an API using this new cool project! Read more...

Cross dialog data accessing
18th of May 2020 Check out how easy is with OpenSIPS 3.1 to access the dialog and accounting data of another ongoing call! Read more...

SIP Push Notification with OpenSIPS 3.1 [RFC 8599][Part 1 + 2]
7th of May 2020 Standards-based Push Notifications, inter-operating with any PN service provider! Read more...

Back-to-Back & Clustering, a love story in OpenSIPS 3.1
30th of April 2020 The clustering and data replication in the Back-2-Back engine is a need for building High-Availability setups! Read more...

DFKS or the "Key to Synchronization"
28th of April 2020 Are you looking for a way to sync the settings of the Class 5 features between the SIP phones and the SIP Server?! Read more...

Releases...

Final release: OpenSIPS 3.0.5
22nd of December 2020 The last release of the OpenSIPS 3.0 version is now available to download! Read more...

Minor releases: OpenSIPS 3.1.1, 3.0.4 and 2.4.9
17th of November 2020 Three new minor releases are available for all supported OpenSIPS Branches! Read more...

Stable release: OpenSIPS 3.1.0
22nd of July 2020 OpenSIPS 3.1.0 stable LTS is now released! Read more...

Beta release: OpenSIPS 3.1.0
27th of May 2020 Check out the latest beta release of the new OpenSIPS 3.1.0! Read more...

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...