I've been dealing with PBX & VOIP phone systems like 3CX, Cisco Call Manager, Callcentric, etc since 2008, and would find this a pleasant task to manage for you.
I've also got a ton of experience with managing servers, and working in all areas of IT, as shown in my portfolio.
I'm also near to your time zone, so we'll be awake at the same hours!
Please give me the chance to serve you!