OpenSIPS 4.0.0 ChangeLog

Released on June 23, 2026

OpenSIPS 4.0.0 is the stable 4.0 release, following the 4.0.0-rc2 candidate. This final step includes release polish, TCP auto-scaling restoration, OpenTelemetry fixes, AoR replication improvements and a few targeted module fixes before the stable tag.

For the full 4.0 feature overview, see the beta and RC changelogs as well. This page covers only the final delta from 4.0.0-rc2..4.0.0.

This changelog summarizes user-visible changes and omits generated documentation rebuilds, version bumps and release mechanics.

Core and TCP Handling

  • Restored TCP worker auto-scaling for the 4.0 stable release. 1e07f93293
  • Allowed newly spawned processes to self-update with the latest reload configuration, keeping auto-scaling workers aligned with the active runtime config. 3a5b50849c

Module Fixes

  • Replicated usrloc AoRs with populated kv_storage, fixing a missing state propagation case between mid_registrar and usrloc. a8780f2bf6
  • Prevented a b2b_entities crash when b2b_init() is called after async processing. cb91891c14
  • Fixed cgrates accounting context restoration during dialog variable replication. ceaf78aab0
  • Fixed aaa_diameter cJSON ownership issues, including double-free handling in dm_avps2json() and ensuring reply cJSON is released regardless of output PV handling. d6543cc31f f8cc1da014

Observability and OpenTelemetry

  • Handled process profiling events in the OpenTelemetry module. 18459029ac
  • Fixed C++ object build cleanup in OpenTelemetry. fc1b2c3c17

Documentation Updates

  • Refreshed MI documentation by grouping core commands by class, documenting missing core commands and linking transport module documentation. d4ec28ad70 a9dcddadf3 3727cac9c7
  • Fixed and refreshed script documentation, including transformation references, crc32 transformation documentation and route examples. 242e5a0343 8c739f80aa 8edec4490e
  • Clarified core event_route handling in EVI documentation. dea21a7a90

Release Files

  • Fixed the generated ChangeLog before the final release tag. 922192f60e
  • Updated the generated ChangeLog and bumped the version to 4.0.0. bce0f8008d acf45c08e7