[Freeswitch-users] voicemail flow

Hi, While dialing voicemail, mod_voicemail.c file plays the primary role. I know it considers sounds.xml,tts.xml(/usr/local/freeswitch/conf/lang/en/vm) and voicemail.conf.xml (/usr/local/freeswitch/conf/autoload_configs). Once the c file is hit after that what happens and how the flow goes? Can anyone please explain? As am not that good in C, I don't understand the flow. Thanks.