1. Enable nibble billing in modules.conf
2. Replace mod_niblebill.c with the attached mod_nibblebill.c
3. Change nibblebill.conf accordingly with your database user and password(only change database name and user and password)
4. Compile and install freeswitch
5. replace astpp.xml.lua and astpp.dialplan.lua with provided attached file in /usr/local/freeswitch/scripts/astpp/scripts
6. replace /var/www/html/fs/lib/astpp.cdr.php with provided attached file astpp.cdr.php
7. Start freeswitch and load mod_nibblebill.