OpenSIPS 1.7.x branch is outdated and not longer maintained, see current available releases.
OpenSIPS 1.7.2 is the last release from 1.7 branch
Minor release (see Changelog from 1.7.1)
Release date: 22nd of February 2012
Minor release (see Changelog from 1.7.0)
Release date: 23rd of November 2011
Release date: 12nd of July 2011