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 including: softphones, ATA's, IP-phones and PBX systems like Asterisk/FreePBX. I read your project description and I may be able to help you with your call recording solution, I do need to clarify with you what kind of recording app that you're building, to ensure that I can help you out. Feel free to contact me through chat at any time.
Thank you.