New minor release in the series of 1.3 is out as v1.3.2. It includes a bunch of fixes from the time of v1.3.1 release. All running 1.3.x in production should upgrade.
The compatibility is kept at database level and for the configuration file. No need to apply changes, just install the new OPENSER version.
More details at www.kamailio.org.
See detailed changes for this release in ChangeLog file.