On the 4th of May, 2012, the SIP Express Media Server project announced the availability of the SEMS 1.4.3 release.
This is a SEMS 1.4 series bugfix release and should be a drop-in
replacement to 1.4 installations. For details of the changes see:
Kamailio, started at the same
institute in Berlin, Germany, having many shared developers. It can be
used together with Kamailio to provide services such as voicemail, audio
conferencing, announcements, IVR menus or back-to-back user agent