[Freeswitch-users] calling card app design decision

Hi, I am wanting to develop a calling card service using FreeSWITCH. It's seems FreeSWITCH is very flexible in terms of how one could go about implementing this service. I am intending to use mod_nibblebill and mod_lcr to do the core stuff. I would like to use Java for any programming (as it's the language I am most familiar with) however, I am unsure whether to take an event socket based approach to the application or to use something like mod_java. Any advice/suggestions will be most welcome. Cheers Raf