I am looking to integrate Multiple ASTPP+Free Switch servers with a Kamailio server or Kamailio servers.
Note: The Kamailio server(s) will handle the actual call routing (incoming and out going), while ASTPP + Freeswitch combination handles the IVR, etc.
But, Authentication, Call Control, Credit Control functions could be shared between the ASTPP + Freeswitch servers with the Kamailio servers.