Hi there,
I am Umair. I can work with your project skills VoIP, UNIX, Asterisk PBX, System Admin and Linux
I have been working as freelancer since 2015 and the skills VoIP, UNIX, Asterisk PBX, System Admin and Linux you mentioned perfectly suits my expertise. I can definitely help you with this project.
Looking forward to your response and discuss in detail.
Umair A.