Lasantha Game Kankanamge
Senior Telecommunications Engineer (Voip) @Voiceflex
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WORK HISTORY
Senior Telecommunications Engineer (Voip) @Voiceflex
London, GB
As a Second Line Support Engineer at Voiceflex, I specialise in advanced VoIP and SIP signalling support for telecom resellers and enterprise customers across the UK and international markets.My role focuses on deep technical investigation and resolution of complex telephony issues, including detailed SIP trace analysis, PCAP packet inspection, RTP flow diagnostics, and call routing behaviour across multi-carrier environments. I regularly analyse signalling at header level (From, PAI, Diversion, Privacy, SDP, etc.) to identify interoperability and routing issues between PBX platforms, SBCs, and upstream carriers.I work extensively with:• 3CX (v18 & v20)• Telavox Flow• Microsoft Teams Direct Routing• Nebula• Asterisk-based platforms• FreeSWITCH environments• AudioCodes SBC platforms (SIP routing, manipulation rules & interconnect configuration)My expertise spans:• Advanced SIP signalling troubleshooting• Deep-dive PCAP & sngrep analysis• CLI presentation, privacy & header-level diagnostics• Fraud investigation & traffic pattern analysis• Carrier interop & routing diagnostics• Multi-platform PBX & SBC integrationBeyond technical delivery, I am consistently recognised by partners and end customers for clear communication, ownership of complex issues, and relationship-driven support — reflected in multiple positive Trustpilot reviews and direct customer feedback highlighting responsiveness, professionalism, and service quality.I am passionate about delivering carrier-grade reliability and technical excellence, ensuring our partners receive precise, commercially aware, and solution-focused support.#VoIP #SIP #UCaaS #AudioCodes #3CX #FreeSWITCH #Asterisk #TeamsDirectRouting #Telecom #SBC #PacketAnalysis #CarrierInterop #CustomerExperience
EDUCATION
University of Northampton
Master of Business Administration - MBA, Business Administration and Management, General
University of Hertfordshire
MSc Advanced Computer Science (Sandwich), Computer Science
St. Benedict's College, Colombo-13
G C E Advanced Level
NCC Education
International Advance Diploma ( IAD ), Computer Engineering
ABOUT LASANTHA GAME KANKANAMGE
With over a decade of experience in the VoIP industry, I specialize in providing advanced technical support and solutions within the telecom sector. As a Second Line Support Engineer at VoiceFlex Limited, a leading telecom provider, I focus primarily on delivering expert VoIP support for telecom service resellers and enterprise clients.Since beginning my journey in VoIP in 2014, I have developed a deep understanding of complex VoIP troubleshooting, including packet analysis using PCAPs and supporting a variety of UCaaS applications. I possess advanced expertise in platforms such as 3CX, Telavox Flow, Nebula, Teams Direct Routing, and Asterisk, as well as managing Teams tenants. My skill set also includes Microsoft 365, Azure, and AWS administration, enabling me to manage cloud-based and on-premises environments effectively.Additionally, I bring strong knowledge of firewall configuration, including hands-on experience with Cyberome and Sophos firewalls, ensuring network security and optimized traffic flow for VoIP and cloud-based applications. I also have experience with Yealink YMCS, VoIP Switch, and have managed number porting processes with BT, Magrathea, and Voxbone, ensuring seamless transitions and service continuity for clients.My role involves not only providing technical expertise but also ensuring a high level of customer satisfaction by delivering effective solutions quickly. I am passionate about leveraging my extensive VoIP, cloud platform, and cybersecurity knowledge to continuously improve system functionality and ensure that VoiceFlex maintains its reputation for delivering reliable, scalable, and seamless communication solutions.I’m also doing my Doctorate in Business Administration (DBA), where I’m exploring how technology can help companies overcome the challenges they face when trying to find the right people. My focus is on reducing the time and effort organisations waste during the early stages of recruitment, and looking at how smarter digital tools and automation can make the process faster, more accurate, and more efficient.
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