[HELP] how to configuration asterisk to auto-call to users

hello everybody! i come from vietnam. Now, I’m designing the asterisk PBX to auto-call to users and users auto-answer. I’m having some difficulty. I can automatically call the user but only to send a file available not going to be able to transmit voice and users can not be automated reply.
I would have finished in the coming weeks. so look forward to your help.
Please send me mail: nguyenthuydhdt7a@gmail.com or my skype account is ha_an93
thanks you for reading my topic!