Telephony Designer (Freelance) - 10 Months - Gosselies, Belgium
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About the Role
We are seeking a Telephony Designer (Freelance) to join our client's Telephony & IoT team for a high-impact, 10-month mission based in Gosselies, Belgium. This is your opportunity to architect, optimize, and secure next-generation IP telephony and call center environments, directly shaping the digital backbone of a major organization. You'll work at the intersection of architecture, operations, and innovation, ensuring performance, availability, and security at scale.
Why This Role Matters
Our client is on a mission to streamline and future-proof their telephony and call center infrastructure. As a Telephony Designer, you will be instrumental in driving architectural evolution, operational excellence, and cost control. Your expertise will ensure business continuity, resilience, and seamless communication for thousands of users, directly impacting organizational efficiency and customer experience.
What You'll Be Doing
Design, document, and ensure the consistency of IP telephony and call center architectures (Mitel/Unify, Genesys Cloud)
Lead integration studies and drive the evolution of existing infrastructures
Define, implement, and support security measures (SIP, encryption, network segmentation, authentication)
Participate in projects for expansion, evolution, or migration of telephony platforms
Configure and maintain telephony and call center environments (call flows, extensions, routing, security)
Monitor and optimize systems: capacity planning, tuning, availability, and quality of service
Ensure system backups, restores, and patching
Implement and track software updates in collaboration with Release Management
Maintain technical and operational documentation (procedures, inventories, user guides)
Provide Level 2/3 support: advanced diagnostics and resolution of complex incidents
Coordinate incident monitoring and escalations with service providers/integrators
Analyze recurring incidents and propose sustainable solutions
Support and train Level 1 teams in daily ticket management
Manage and challenge external service providers
Conduct audits and site surveys to verify technical readiness
Produce and analyze KPIs (performance, availability, quality)
Contribute to system streamlining and cost control
Occasionally support related services: printing infrastructure, multimedia, SIM fleet management, and small IT equipment requests
Participate in planned interventions outside business hours as needed
Guarantee continuity and resilience of telephony services
Technical Skills
Expertise in IP telephony environments (Mitel, Unify) and call center platforms (ideally Genesys Cloud)
Strong knowledge of SIP, RTP, VoIP, routing, and switching
Network design and architecture for IP telephony (QoS, VLAN, SBC, SIP trunk)
Mastery of telephony security (TLS/SRTP, firewalls, SBC, authentication, segmentation)
Experience monitoring and tuning telephony environments (voice quality, latency, MOS, jitter)
Familiarity with ITIL processes: incident, problem, and change management
Proficiency with monitoring and ticketing tools (e.g., ServiceNow, Nagios, Grafana, or equivalent)
Experience coordinating and managing service providers
Experience in multi-site environments and cloud integration is a strong plus
Proven ability to create and maintain operational and technical documentation
Experience designing, adapting, or implementing new telephony and call center systems
Experience in Genesys Cloud call center technologies is highly valued
Experience in monitoring and tuning telephone network systems
Experience coordinating teams and partners/integrators
Language Proficiency
French: C1 (CEFR) – must have
English: B2 (CEFR) – must have
Project Details
Freelance position
Full-time, 10-month mission (with possible extension)
Location: Gosselies, Belgium (hybrid: minimum 2 days/week on-site)
Start date: 16 February 2026
End date: 31 December 2026
Vetting Process
All candidates are rigorously vetted through our VECTOR7 Signal Stack, ensuring only the top 2% of tech builders join our movement. Reference checks and background screening are mandatory for this high-trust role.
Ready to build the future with us? Upload your CV now and join the movement of elite builders at RELYzIT Talent.
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