[Freeswitch-users] libsrtp

Hello, We'd like to use srtp with sofia. I read that freeswitch uses libsrtp, but i don't know how can i configure mod_sofia to use srtp. By the way, in wich state is the srtp support? Is it finished? Or work in progress? If i can use sofia with srtp, please tell me an example. Thanks, Tamas