[Asterisk-Users] Setting up IP PBX

[ram]

Hi all
 iam new to this VoIP
 iam just looking to deploy
 IP PBX Services
 I have 4 port gateway to call Around the world
 i want to setup with Asterix the followings
  local user authentication and billing
user authenticated need to route to 4 port gateway
call record track
call start time, end time
duration of call
  so how can i intregrate to test first level with my 4 port gateway
with NAT, using SIP
 my users can be public IP or Private..
 please suggest me
 integration docs and installations
 thanks
ram
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