http://ederwander.wordpress.com/2010/02/22/dial-string-inject-in-freeswitch/
 
just for yours informations i write this article my test for injections in freesitch
 
version of my tests
 
freeswitch@internal> version
FreeSWITCH Version 1.0.5-20100218-0400 (hacked)
freeswitch@internal>