[Freeswitch-users] Integrate with a media server

Hi, We plan to bridge calls to a application (media) server that acts as a IVVR server. After that, the ap server transfers back the call to a queue (callcenter). The question is what's the role of the ap server in the freeSWITCH? We try to register it as a UA, seems not work. Any advice? Regards, Jimmy