OpenSIPS 4.0.0


     goes from beta to stable


*It got stable!*

There were two full months of work, of testing, of reporting and of fixing, but we did it! The *OpenSIPS 4.0* release passed all the tests and exams and now it is labelled as a stable release, the new flagship of the OpenSIPS project. Note that 4.0 is the _first release in the 4.0 family_, opening the path for radical enhancements and improvements <https://blog.opensips.org/2025/07/23/opensips-4-x-the-next-evolution-step/>.

*4.0 Philosophy*

The OpenSIPS 4.0 release addresses old limitations, deprecated designs or burning needs we accumulated across years. Concepts we had from day 1 (in SER at that time) were reworked or removed. Also new concepts were added, to align OpenSIPS with the challenges of the current days.

So key features :

 * TCP framework re-design
 * TLS support refreshing
 * Versatility (dynamic forking, bond interfaces)
 * Monitoring and profiling, script and code level
 * More integration (proxy protocol, IMS interop, WEB3 auth)

Read more on 4.0 <https://www.opensips.org/About/Version-Overview-4-0-0>


Any questions? do not hesitate to contact us <mailto:[email protected]>!

------------------------------------------------------------------------


--
Bogdan-Andrei Iancu
  OpenSIPS Founder and Developer
  http://www.opensips-solutions.com
  https://www.siphub.com
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