Nikita Maksimenko

Senior VoIP Engineer Eltex / Eltex Alatau (Kazakhstan) Senior VoIP engineer with 10+ years of experience in telecom and VoIP systems. Previously led technical support team and worked on full-cycle deployment and support of telephony solutions. Key responsibilities: Design and deployment of VoIP solutions (Asterisk-based and vendor systems) SIP routing, dialplan configuration, and integration with external operators Troubleshooting complex issues (one-way audio, NAT, registration, routing failures) Interaction with telecom operators (SIP, E1), testing and validation Pre-sale activities: solution design, project estimation, and architecture planning Support of production systems with high availability requirements Key projects: 🚑 Emergency Call Center (103 / 109 / 112 services) Designed and deployed a 24/7 call center system for emergency services Ensured continuous operation with redundancy and failover mechanisms Integrated multiple communication channels (SIP and E1) Maintained system stability under constant load (5–10 concurrent calls, non-stop traffic) 🏭 Large Enterprise Telephony System (≈2000 subscribers) Built and deployed a distributed telephony system for industrial infrastructure Implemented hybrid network (IP + analog + fax integration) Configured VoIP gateways and remote endpoints Handled peak load up to 50–60 concurrent calls Ensured high availability and system reliability

Telecom Operator (PrimeTel / similar) VoIP engineer in a live telecom environment with real subscribers and high call volumes. Responsibilities: Full-cycle support of VoIP infrastructure (registration, routing, troubleshooting) Handling customer issues (no registration, one-way audio, misconfiguration) Configuration of routing logic across multiple platforms Testing and validation of E1 connections with telecom operators Simulation of emergency systems (link failure, drop scenarios) Technical environment: Asterisk-based systems (including MOR platform with billing) SIP trunking and routing E1 Data streaming Multi-vendor telecom infrastructure Key achievements: Supported system with up to 300–400 concurrent calls Resolved complex production issues affecting real users Ensured stable interconnection with external telecom providers

Provide technical support for client companies. Configure PBX systems and SIP trunks. Troubleshoot VoIP issues such as SIP registration, routing problems and one-way audio. Configure dial plans, E1 trunks and VoIP integrations. Analyze SIP logs and traces to identify problems.