Position: Sysadmin - Telecommunications Engineer
Category: Sysadmin
English level: basic
Years of experience: 6


Skills: 
Experience in configuring and servicing: VocalTec, Iskratel SI3000 software; Oracle SBC; GSM, FXO/FXS, TRI-to-SIP - gateways; SIP phones; Softphones; Basically FreePBX, Asterisk.  
Ability to analyze SIP traffic at a high level. Wireshark, sngrep, tcpdump. 
Knowledge of SDP, RTP/SRTP, SIP TLS, TCP/IP.  
Administration OS Ubuntu, CentOS (basic level).  
Virtualization: VMware, VirtualBox, Proxmox.  
Spoken English at the initial level: reading correspondence, technical documentation. 

Experiense: 
Troubleshooting of subscriber problems of VoIP, services of the company's product.  
Administration OS Ubuntu; configuring elements in Zabbix, Zabbix-agent, Zabbix-Proxy; configuring TCP/IPv4 on servers, routers; deploying GoIP SMS Server, GoIP Remote Control Server; Configuring Voipmonitor. Installing virtualization systems on physical servers with RAID setup, setting up partitions, installing and configuring the use of RAM, setting up network connections, installing databases, iptables, fail2ban. Setting up IPSec between the asterisk server and MicrotikRouter with a local network with SIP gateways. Configuring MicrotikRouter on several interfaces with priority routing, DHCP server, Bridge, Firewall configuration (Filter rules + NAT + RAW) that excludes almost all known attacks, SIP-ALG configuration. I have SIP debugging tools: WireShark, tshark, tcpdump, sngrep. Configured traffic sniffing via tzsp2pcap protocol between Mikrotik and linux server. 

Support and development of the telephone network. Testing, setting up, diagnostics, monitoring of telephony equipment of the world's leading brands.  

Compiling a list of technical requirements, testing, correspondence with vendors in the company's tenders for VoIP-gateways, Virtual PBX, Self-Branded Softphone.