I have 17+ (since 1997) years experience in system administration on FreeBSD servers and routers, Cisco routers and switches, TCP/IP, Centos Linux on trixboxes and Elastix, MikroTik routers, VMWare ESXi, etc.
I have network and system andminstration, network engineering, management, troubleshooting and repair experience and skills.
Also I have voip experience in such protocols h323, sip, iax2, and configuring various voip devices and clients. Setup trixbox, elastix servers with voip clients and trunks. Configure security for that se