About -> Available Versions -> Version 3.1.x
OpenSIPS 3.1.x is a stable, LTS release. It is recommended for production usage.
OpenSIPS 3.1 Overview - a glimpse in the blueprints of OpenSIPS 3.1 to see what this new release can do for you.
Minor release (see Changelog from 3.1.2)
Minor release (see Changelog from 3.1.1)
Minor release (see Changelog from 3.1.0)
Release notes: full technical listing