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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...

How to Eliminate Zombie Registrations in OpenSIPS
4rd of October 2024 Or how to improve your OpenSIPS registrar performance and also your user's experience in the same time. Read more...

Amazon’s SQS Events in OpenSIPS 3.6
10th of September 2024 More on the OpenSIPS 3.6 integration with the AWS cloud using Amazon Simple Queue Service (SQS). Read more...

Amazon’s DynamoDB integration in OpenSIPS 3.6
07th of August 2024 OpenSIPS 3.6 turns an eye on backends to facilitate AWS integration, like DynamoDB NoSQL database. Read more...

HTTP/2 Server Support for Next-Generation Services in OpenSIPS 3.5
27th of March 2024 OpenSIPS 3.5 includes support for processing HTTP/2 requests, becoming more interoperable with other components in 5GC systems. Read more...

Build an IMS using OpenSIPS 3.5 – S-CSCF
21st of March 2024 Focusing on the S-CSCF (Serving – Call Session Control Function) component, with async Diameter, AKA auth and others. Read more...

The SQL support, reloaded
13th of March 2024 See how the SQLops module was born from the AVPops ashes and how you can do from script JSON structured SQL queries with prepared statements support. Read more...

Built-in Diameter Server in OpenSIPS 3.5
07th of March 2024 A blog post on how to build Diameter server-side logic within your opensips.cfg file. Read more...

LaunchDarkly integration with OpenSIPS 3.5
04th of March 2024 In-cloud management of feature flags was never been so easy as via LaunchDarkly and OpenSIPS 3.5. Read more...

Releases...

Minor releases: OpenSIPS 3.5.1, 3.4.8
21st of August 2024 A new round of minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.5.0-rc1, 3.4.6 and 3.2.19
19th of June 2024 New minor releases for all versions. EOL for OpenSIPS 3.2! Read more...

Minor releases: OpenSIPS 3.4.5, 3.2.18
18th of April 2024 A new round of minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.4.4, 3.3.10, 3.2.17
21st of February 2024 A new round of minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.4.3, 3.3.9, 3.2.16
20th of December 2023 EOL for OpenSIPS 3.3! New minor versions for all stable releases. Read more...

Minor releases: OpenSIPS 3.4.2, 3.3.8, 3.2.15
18th of October 2023 New minor versions for all stable releases! Read more...

Minor releases: OpenSIPS 3.4.1, 3.3.7, 3.2.14, 3.1.17
31st of August 2023 Four new minor versions of our stable releases are out! Read more...