» OpenSIPS 3.1.0 is out - 27th of May 2020 Let's welcome the 3.1.0 beta release, focused on complex call crafting. Learn how you can create and handle complex multi-call scenarios specific to Class 5 area.   » OpenSIPS Summit 2020 - 18th of March 2020 IMPORTANT! In the context of the COVID-19 pandemic, by the community poll, we decided to postpone for beginning of September 2020

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...

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]
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...

Call Center – an easier integration with OpenSIPS 3.1
21st of April 2020 Enhanced wrap-up time, call dissuading support, pre-call announcements, agent's events? All new additions in 3.1! Read more...

Real-Time Rating and Cost Based Routing in OpenSIPS 3.1
07nd of April 2020 Looking for a quick and easy way of putting a price for a call, without relying on external applications? Here it is! Read more...

Releases...

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...

Minor release: OpenSIPS 2.4.6
11th of June 2019 Latest bug fixes for the OpenSIPS 2.4 LTS versions have been released! Read more...

Final release: OpenSIPS 2.2.8
11th of June 2019 The last version of OpenSIPS 2.2.8 has been released! Read more...

Stable release: OpenSIPS 3.0.0
29th of May 2019 Check out the newest major stable release, the OpenSIPS 3.0.0! Read more...

Beta release: OpenSIPS 3.0.0
16th of April 2019 Check out the latest beta release of the new OpenSIPS 3.0.0! Read more...