Technical Support Engineer - Voice & IP Networks

Ekinops; Massy; On-site; EUR 70,000 - 90,000; Full time

Job summary

Ekinops in Massy, France is seeking a senior technical support engineer for the CSO Access team to own complex customer incidents and drive PoCs with PreSales. You will diagnose issues, configure, and validate interoperability across networks and services.

You will investigate voice signalling, IP connectivity and collaborate with R&D on defects, while delivering customer trainings and participating in a 24/7 on-call rotation.

Qualifications

• Hands-on VoIP/SIP expertise with SBCs and SIP/SDP call flows.
• Strong IP networking knowledge: routing, switching, TCP/IP, VLAN, NAT, QoS, VPNs.
• Experience in telecom/network technical support or engineering; voice troubleshooting.
• Fluent professional English is a must.

Responsibilities

• Own complex customer incidents from diagnosis to resolution.
• Prepare and execute technical PoCs with PreSales: integration and interoperability tests.
• Investigate voice signalling, media and IP connectivity via traces and captures.
• Collaborate with R&D on defect analysis and fix validation; provide training or workshops.
• Participate in the 24/7 on-call rotation.

Skills

VoIP & SIP expertise

SBCs

IP networking

SIP/SDP

RTP media

ISDN BRI/PRI

English fluency

Troubleshooting

Job description

For over 20 years, Ekinops has been driving innovation in network systems. We provide solutions focused on the needs of communication service providers and enterprises worldwide.

Ekinops is a leading European player offering Optical Networking, Enterprise networking, and cybersecurity solutions, serving service providers and enterprises in over 70 countries.

Over 50% of our 600+ strong team works in our multi-national Agile R&D centers. Our company has a strong international background, with sales offices strategically located around the world.

Ekinops is recognized for its ESG commitments with its rating in the EthiFinance ESG Ratings 2023 report and its Gold Medal awarded by EcoVadis in 2025.

Join Ekinops’ international CSO Access team to solve demanding voice and IP networking challenges for telecom operators, service providers and integrators worldwide. This hands‑on senior role blends advanced technical support with customer Proofs of Concept (PoCs), product validation and direct collaboration with R&D.

Your role:

• Own complex customer incidents, from technical diagnosis and root cause analysis to workaround and resolution.
• Prepare and execute technical PoCs with PreSales: integration, configurations, interoperability tests and customer validation.
• Investigate voice signalling, media and IP connectivity through traces, logs, packet captures and lab reproductions.
• Work with R&D on defect analysis and fix validation; occasionally deliver customer, partner and internal technical training or workshops.
• Participate in the 24/7 on-call rotation.

Your profile:

• Strong hands‑on VoIP/SIP expertise: SBCs, SIP/SDP call flows, RTP/media and advanced troubleshooting.
• Solid IP networking knowledge: routing, switching, TCP/IP, VLAN, NAT, QoS and VPNs.
• Traditional telephony (ISDN BRI/PRI, FXS/FXO), TDM/IP interworking and operator interoperability.
• Proven experience in telecom/network technical support or engineering, with hands‑on voice troubleshooting;
• Fluent professional English is a must.
• Structured problem-solving, end‑to‑end ownership, autonomy and confident customer communication.

Recruitment process :

At Ekinops, we believe diversity makes us stronger! We hire talents based on skills, experience, and potential—nothing else. No matter your age, gender, background, or abilities, what matters to us is what you bring to the team. Join us and thrive in an inclusive, open-minded workplace where everyone has a voice!