New stable release of OpenSER was out on the 23rd of March as version 1.2.1. It is patch release of branch 1.2, emerging from the fixes done to the 1.2.0 release. All people using 1.2.0 release are encouraged to upgrade to 1.2.1 as it includes several important fixes.
The upgrade should be seamless, there is no updated to the database structure or to configuration file syntax. The fixes concern only the bugs and issues occurred in 1.2.0 release.