Hello, I'm a voip specialist with 10+ years of experience working on the TS department of a US voip company; I can install, troubleshoot and customize many VoIP devices such as : softphones, ATAs, IP-phones and PBX systems like Asterisk/FPBX. I read your project description and I can setup your Dongle, PSTN lines , call-flows and security according to your requests. Feel free to contact me through chat at any time so we can discuss the project further and get started.
Thank you.