For those willing to develop and who don't want to use C, it is now possible to use Perl or Java. These programming languages are easier to learn and to debug than C.
Perl is a new module present in OpenSER 1.2.x. It may be used to develop applications interfacing directly to OpenSER. Check the documentation at www.openser.org. http://www.openser.org/docs/modules/1.2.x/perl.html.