Good day! My name is Roman. I am a VoIP engineer, Asterisk Certified Administrator (dCAA), MikroTik Certified Engineer (MTCNA), an expert in the field of software IP-telephone stations, network equipment and server settings. From the idea to the full project. I propose an optimal solution: server scanning based on an iron server, or based on a virtual machine running Linux, using a software IP telephone exchange Asterisk running FPBX. Based on your requirements, I will develop exactly the solution that you like. Contact me to start our cooperation! Thank!