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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)

Latest News...

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...

Fine-Grained TCP Configuration Using the "tcp_mgm" Module
20th of April 2022 OpenSIPS 3.3 brings full control over TCP connections along with TCP throughput enhancements! Read more...

OpenSIPS 3.3 – interim update
06th of April 2022 Learn what was already done, what is left to be done and when the 3.3 major release will be ready ! Read more...

Managing RCS Capabilities with OpenSIPS
31th of March 2022 Making OpenSIPS 3.3 RCS ready - let’s take a look at some sample RCS-enriched SIP messages and what those lists of RCS capabilities look like? Read more...

Status/readiness and reporting framework in OpenSIPS 3.3
17th of March 2022 How manageable and transparent is your OpenSIPS when comes to what is happening within its internals? is my OpenSIPS ready? What happened within my OpenSIPS? Read more...

OpenSIPS 3.3 Messaging in the IMS and UC ecosystems
20th of January 2022 Find out the OpenSIPS 3.3's vision on Instant Messaging in the IMS and Unified Communications ecosystems - it's definitely a problem solver! Read more...

The OpenSIPS Security Audit is happening
30th of September 2021 The security audit has already started, EnableSecurity is doing a fantastic job in terms of torturing OpenSIPS 3.2! Read more...

Releases...

Minor releases: OpenSIPS 3.2.6 and 3.1.9
22nd of April 2022 Two new minor versions of our stable LTS releases are out! Read more...

Minor releases: OpenSIPS 3.2.5 and 3.1.8
23rd of February 2022 Two new minor versions of our stable LTS releases are out! Read more...

Minor releases: OpenSIPS 3.2.4 and 3.1.7
22nd of December 2021 Two new minor versions of our stable LTS releases are out! Read more...

Minor releases: OpenSIPS 3.2.3 and 3.1.6
20th of October 2021 Two new minor releases are available for all supported OpenSIPS branches! Read more...

Minor releases: OpenSIPS 3.2.2 and 3.1.5
19th of August 2021 Two new minor releases are available for all supported OpenSIPS branches! Read more...

Final release: OpenSIPS 2.4.11
22nd of June 2021 OpenSIPS 2.4 LTS has come to its final minor release, the 11th of its kind! Read more...