Олексій

OLEKSII KINASH
Senior Telecom / VoIP / NOC Engineer

Address: Svobodova 1058/15, 407 53 Jiříkov, Czech Republic
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PROFESSIONAL SUMMARY

Senior Telecom & VoIP Engineer with 15+ years of experience in carrier-grade VoIP, PSTN
infrastructure, SIP/RTP troubleshooting, telecom traffic analysis, fraud detection, and NOC
operations. Strong background in Asterisk-based solutions, EWSD switching systems, call
routing optimization, and network performance analysis. Experienced in detecting abnormal
traffic patterns, preventing illegal VoIP termination, and collaborating with carriers and security
agencies. Combines deep technical expertise with a highly analytical and investigative mindset.

CORE SKILLS

Telecom & VoIP

 SIP, RTP, SRTP, SIP Call Flow, SIP Trunking
 Class 4/5 softswitch operations
 Asterisk configuration and dialplan engineering
 VoIP termination systems and route optimization
 EWSD switching systems (PSTN legacy)
 FAS detection, CLI validation, anti-fraud techniques
 Interconnect routing and carrier communication
 QoS troubleshooting (MOS, jitter, latency, packet loss)
 SIP trace analysis, CDR analysis, signaling diagnostics

NOC & Monitoring

 Tier-2/Tier-3 incident response
 24/7 network monitoring and alarm handling
 Analysis of KPIs: ACD, ASR, PDD, CPS, CCR
 Incident escalation and coordination with engineering teams
 SLA monitoring and reporting

Networking & Systems

 TCP/IP, DNS, NAT, routing and switching
 VPN: OpenVPN, WireGuard
 Linux (CentOS, Ubuntu), bash scripting
 Firewalls and basic network security
 MySQL, PostgreSQL for telecom-related applications
Development & Automation

 Scripting and tool development for traffic analysis
 Basic Android development (Kotlin, Java)
 API integration and automation of routine tasks

MAJOR ACHIEVEMENTS

 Designed and implemented a pattern-based detection algorithm to identify illegal
VoIP/SIM-box traffic with approximately 95% accuracy using EWSD AMA records.
 Developed a custom tool (Visual Basic) to analyze binary AMA files and detect
abnormal outbound calling behavior across the network.
 Supported law-enforcement and national security agencies by providing technical
expertise and confirming fraudulent VoIP equipment during on-site operations.
 Improved PSTN routing and reduced routing violations by analyzing traffic flows and
coordinating corrective actions with internal divisions.
 Operated an Asterisk-based VoIP termination platform with VoIP gateways (e.g.,
AddPac), handling routing, codec negotiation, and QoS tuning.
 Resolved numerous complex SIP/RTP issues (one-way audio, call drops, codec
mismatch, failed call setup) using Wireshark and detailed signaling analysis.

PROFESSIONAL EXPERIENCE

Gas Transmission System Operator of Ukraine LLC
Automation Service Engineer
2019 – 2021 | Ukraine

 Ensured reliable and secure operation of automation and control systems.
 Maintained and repaired computer equipment and industrial automation hardware.
 Planned and executed maintenance, diagnostics, and repair schedules.
 Managed technical documentation and contributed to process improvements.

Lexico Telecom LTD
Network Operations Center Engineer
2015 – 2017 | Ukraine

 Monitored network alarms and dashboards to detect and analyze incidents.
 Performed Tier-2 incident response for VoIP and network-related issues.
 Coordinated planned maintenance windows and communicated with customers.
 Handled ticket lifecycle: creation, updates, escalation, and closure.
 Acted as a liaison between customers, account managers, and engineering teams.
Prosecutor's Office, Mykolaiv Region
Senior IT Engineer
2012 – 2014 | Ukraine

 Ensured stable operation of computer networks and IT infrastructure.
 Maintained network security and system reliability.
 Provided technical support for employees and resolved hardware/software issues.

International Telecommunication Company (ITC)
Software Engineer
2010 – 2012 | Ukraine

 Provided technical support for ITC telecom subscribers.
 Maintained telecommunications equipment and related software systems.
 Assisted in troubleshooting network and service-related issues.

Ukrtelecom
Telecommunications Engineer (EWSD / Traffic Analysis)
2005 – 2010 | Ukraine

 Maintained and supported EWSD switching systems in a regional PSTN environment.
 Analyzed traffic patterns and optimized routing to improve network performance.
 Worked with AMA (Automatic Message Accounting) records to investigate abnormal
call behavior.
 Developed a custom fraud-detection tool to identify illegal VoIP/SIM-box activity based
on subscriber calling patterns and call distribution.
 Verified suspicious cases through callback to subscribers and prepared reports for
internal security and external agencies.
 Cooperated with national security services during telecom fraud investigations and
confirmed fraudulent equipment during on-site inspections.

OTHER PROJECTS (TELECOM & VOIP)

Self-operated VoIP Termination Platform
2010 – 2017

 Built and maintained a small VoIP termination setup based on Asterisk and VoIP
gateways (e.g., AddPac).
 Configured dialplans, routing logic, codec negotiation (G.711, G.729), and basic QoS
settings.
 Performed SIP/RTP troubleshooting, CDR analysis, and route quality monitoring.
 Handled interconnect settings, technical configuration, and issue resolution with partners.

EDUCATION
2000 – 2005 | Computer Systems and Networks Specialist
Odessa Mechnikov National University
Specialty: Computer Networks and Systems

2006 | Professional Certification
State University of Telecommunications, Kyiv
Course: Construction and Maintenance of IP-Telephony Systems

LANGUAGES

 Ukrainian — Native
 Russian — Fluent
 English — Intermediate (strong technical reading and communication)
 Czech — Basic (currently studying)

ADDITIONAL INFORMATION

 Driving license categories A, B (since 2007)
 Available for relocation within the Czech Republic and nearby regions
 Open to full-time remote work opportunities