Hello, I'm a voip specialist with over 10 years of experience working on the TS department of a US voip company; I can install, troubleshoot and customize many VOIP devices including: softphones, ATAs, IP-phones and PBX systems like Asterisk/FPBX. I read your project description and I can help you fix the error that you are experiencing, we'll need ssh access to your PBX/linux server. I'm available through chat.
Thank you.