ASterisk chat room-VoIP

1)i would like to have some group of chat room developed in asterisk software 2)the chatroom is "booked" when an external server to asterisk, sends a request to the asterisk box to have a chat room and password assigned (via XML or some other command you recommend) 3)the chatroom should allow temporary access to users which have the access code after calling some DID number 4)the access code to the chatroom should be generated to the asterisk and will be send to an external server, via XML or using GET command or something like that. 5)If you could provide a DID number for Peru would be great but it is optional. budget is US$200 the challenge would be to have it hosted in a public hosting service (based on your recommendation)or some other hosting