Network & Telephony Administrator

About the role

Archirodon, an international EPC contractor active for more than half a century in energy, marine, infrastructure and defence and security projects, is looking for a Network & Telephony Administrator. You will work with state-of-the-art technologies to keep the Group's IT network and IP telephony systems running across country offices and site operations, including network hardening and SIEM security monitoring.

Key responsibilities

• Keep the Group's network, VoIP and firewall infrastructure (routers, switches, firewalls, VLANs, cabling, licensing, upgrades, troubleshooting) running smoothly and securely.
• Be the main technical owner of Cisco Call Manager (CUCM), Cisco collaboration endpoints and global IP telephony deployments.
• Troubleshoot CUCM, collaboration endpoints, ISE and firewalling issues, focusing on voice quality, SIP signaling and call routing.
• Review daily health checks of network devices and telephony clusters and take corrective action.
• Manage vendors and partners for networking and telephony, ensuring SLAs for critical voice links and SIP trunks.
• Improve IT processes and procedures and recommend changes upwards.
• Maintain system access, user accounts, network drives and passwords.
• Take part in cross-functional IT projects such as ISE implementation, VoIP migrations and telephony cluster upgrades.

Required profile

• BSc degree in IT, telecommunications or a related field.
• At least five years of experience in network and telephony administration, with a strong focus on enterprise-level IP telephony in Cisco and Fortinet environments.
• Proven experience in voice troubleshooting (SIP signaling, RTP streams, QoS, voice gateways, dial plans).
• Experience managing vendors and partners, especially telecom and SIP trunk providers.
• Fluent English.

Required skills

• Deep hands-on experience with Cisco Call Manager (CUCM), Cisco Unified Communications and collaboration endpoints.
• Working knowledge of Cisco ISE and Fortinet firewalls is a strong asset.
• Cloud services (Microsoft Azure) experience is an asset.
• Cisco collaboration or routing and switching certifications, Fortinet certifications or current Microsoft certifications are highly welcomed.