Hello, i am a VoIP engineer with more than 7 years of expertise in the field, i have worked with asterisk, freepbx, elastix, 3cx, freeswitch, and most popular Voip billing solutions in the market, i can assist you with your requirements and give the support needed to have your system fully set and configured. if you are interested to talk regarding this task, please hit me on chat or add me on skype: montana3601 , regards!