Telecommunications
10 VoIP and telephony engineering experts
These ten professionals have worked on VoIP and telephony engineering as VoIP engineers, voice architects and developers at telecom carriers, communications platforms and software companies. A reader can learn how practitioners approach VoIP and telephony engineering from people who have done the work.
Professionals to explore
01—10Asad Ullah
LinkedInExperience: Principal VoIP Engineer · i2c Inc.
Principal VoIP Engineer at i2c Inc. since 2021; he was Senior VoIP Engineer there from 2018 to 2021. Former VoIP Engineer at Noveltysoft (2015-2018). The profile describes him as a SIP specialist working with Asterisk, FreeSWITCH and FreePBX across VoIP systems and protocols.
Ashish Dahat
LinkedInExperience: Senior VoIP Engineer · [24]7.ai
Senior VoIP Engineer at [24]7.ai since 2016, where the profile describes deploying and configuring Oracle Acme session border controllers and Dialogic media gateways. Former VoIP Voice Back-office Engineer at Huawei (2015-2016) and Switch Engineer at Nokia Siemens Network (2010-2012).
David Villaume
LinkedInExperience: Lead Senior VoIP Architect FreeSWITCH & Kamailio · Sewan Groupe
Lead Senior VoIP Architect for FreeSWITCH and Kamailio at Sewan Groupe since 2019, after serving there as VoIP Administrator and N3 Support Engineer (2015-2019). The profile describes 15+ years designing, deploying and scaling high-load SIP-based communication platforms in production.
Denys Pozniak
LinkedInExperience: VoIPOps Engineer · Kwebbl
VoIPOps Engineer at Kwebbl since 2018. Former VoIP Network Engineer at Channels (2016-2018), Telecom Consulting Engineer at S&T Iskratel (2011-2016) and Senior Voice Network Engineer at PrimeTel (2010-2011). The profile lists Kamailio, OpenSIPS, FreeSWITCH, Asterisk and SIP among his VoIP skills.
Graham Keane
LinkedInExperience: Senior Engineer & Developer · Pure IP
Senior Engineer and Developer at Pure IP since 2023, after serving there as Engineer and Developer (2018-2023). Former Engineer at Telappliant (2013-2018). The profile describes him as a VoIP engineer building tools for global carriers, handling large migrations and solving enterprise voice problems, including moving around 3,000 UK shops between voice providers.
Hamza Khalid
LinkedInExperience: VoIP Engineer · Telnyx
VoIP Engineer at Telnyx since 2026. Former VoIP Developer at Etisalcom Bahrain Company (2022-2026) and System Engineer (VoIP) at Noveltysoft (2020-2021). The profile describes delivering VoIP services with DevOps tooling for automation, monitoring and scaling, with hands-on work in Asterisk, OpenSIPS and FreeSWITCH.
Richard Robson
LinkedInExperience: Senior Voip Engineer · 8x8
Former Senior VoIP Engineer at 8x8 (2022-2025) and VoIP Engineer at Fuze, an 8x8 company (2017-2025). Now a freelance VoIP engineering consultant. The profile describes over 30 years in IT and telecommunications focused on designing, deploying and supporting high-availability voice infrastructure.
Sebastian Sastre
LinkedInExperience: Senior VoIP Systems Developer III · Great HealthWorks
Former Senior VoIP Systems Developer III (2018-2019) and Senior VoIP Systems Developer II (2017-2018) at Great HealthWorks, and VoIP Developer at IPCOM (2011-2016). Principal Engineer at Weave since 2022, after serving there as Staff Engineer from 2019. The profile describes over two decades as a VoIP engineer and developer, from traditional TDM networks to cloud native systems.
Siddhardha Garige
LinkedInExperience: VoIP Engineer - VoIP and Network Applications · xG Technology Inc.
Former VoIP Engineer for VoIP and Network Applications at xG Technology (2012-2015). Sr. Systems Engineer (911 Operations) at Comtech Telecommunications since 2017 and Staff System Engineer at Allerium since 2025. The profile describes designing, deploying and supporting large-scale distributed VoIP infrastructure using SIP, RTP and SDP.
Syed Khaja Ruknuddin
LinkedInExperience: VoIP Engineer III (Genesys Cloud CX Zoom Contact Center Cisco Collaboration & Contact Center) · Cincinnati Bell
VoIP Engineer III at Cincinnati Bell since 2021, covering Genesys Cloud CX, Zoom Contact Center and Cisco collaboration. The profile describes telephony configuration of trunks, DIDs and AudioCodes SBCs and troubleshooting complex call flows and SIP signaling. Former Network Voice Lead at Tech Mahindra (2018-2021).
Choose the right perspective
Match the platform to your question, since carrier networks, cloud calling platforms and contact center systems each raise different engineering problems. Consider whether you need someone focused on open-source voice stacks such as FreeSWITCH and Kamailio or on enterprise collaboration and contact center systems.
Questions to take into the conversation
- 01How do you troubleshoot call quality problems that only appear under load?
- 02What tradeoffs come up when choosing between open-source and commercial session border controllers?
- 03How do you plan a migration of a large number of sites from one voice provider to another?
Reaching VoIP and telephony engineering experts
How can I contact one of these VoIP and telephony engineering experts?
Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 10 companies, including i2c Inc., [24]7.ai and Sewan Groupe, based on profile data retrieved on October 9, 2026. Being listed here doesn't mean someone has agreed to take calls.
How much does it cost to reach VoIP and telephony engineering experts?
You choose the offer, starting at $5 per person. It includes Instant Expert's 20% fee, so an offer that pays the person $100 costs you $125. You're charged only when the person books the call or sends the answer.
What if they don't reply?
You pay nothing. Instant Expert sends follow-up reminders, and if the person hasn't booked or answered within 7 days, the request expires and any hold on your card is released. You can invite several of the 10 people on this list at once and cap your total spend, so you pay only for the ones who accept.
Can an AI agent ask one of these VoIP and telephony engineering experts a question?
Yes. An agent with a USDC wallet on Base can ask one question without an Instant Expert account. It names the person, for example by the LinkedIn URL on this page, and pays per ask over x402 (HTTP 402). The person answers in writing or by voice note, and if nobody answers within 7 days, the payment goes back to the wallet automatically. x402 docs
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot and may describe past or present roles. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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