We are looking for a VoIP / Asterisk Engineer (Middle) with over 2 years of experience to support and develop our own IP telephony system. The main focus is on Asterisk, SIP, Linux, and integrating telephony with backend systems. Our IP PBX covers the full cycle of telephony operations: SIP agent registration, call routing, call recording, CDR storage, attack protection, REST API, and SIP traffic monitoring.

Main Tasks

— Support and development of Asterisk-based IP PBX. — Configuration of dialplans, SIP trunks, SIP agents, and call routing. — Integration of backend applications with Asterisk via ARI/AMI. — Diagnostics and resolution of issues with SIP traffic and call quality. — Ensuring telephony security and fault tolerance: fail2ban, firewall, protection against SIP/brute-force attacks. — Working with CDRs, call recordings, their storage, and rotation. — Infrastructure support: Linux, MariaDB/MySQL, Redis, Nginx, cron, Samba. — Configuration and support of monitoring systems (Grafana Alloy, Heplify). — Maintaining technical documentation.

Requirements

— Over 2 years of practical experience with Asterisk. — Good understanding of the SIP protocol: registration, NAT traversal, codecs, diagnostics of typical problems. — Practical experience with ARI and/or AMI. — Confident Linux administration skills. — Experience with MariaDB/MySQL and basic SQL. — Understanding of network security and the principles of firewall/fail2ban operation. — Experience with Redis. — Experience configuring Nginx as a reverse proxy. — Understanding of network security principles (fail2ban, firewall, DDoS/brute-force protection). — Experience with monitoring systems (Grafana, Prometheus, or similar). — Independence and ability to diagnose technical problems.

Conditions

— 5/2 work schedule.