Network & Telephony Administrator
Location
Paiania, Attica
Job Type
full-time
Category
Computer Occupations
Posted
June 23, 2026
Job Description
You will work with state-of-the art technologies to ensure continued function and administration of all IT network and IP telephony system (Cisco Call Manager) across the Group (including both Country Offices and site operations). You will assess and improve the network hardening, and you will manage security monitor systems (SIEM) with goal to ensure systems’ health security posture.
What you will need to do:
- Ensure the smooth, secure operation and optimization of the Group’s Network, VoIP and Firewall infrastructure (including routers, switches, firewalls, vlan, cabling, licensing, upgrades, troubleshooting etc.)
- Act as the primary technical owner for Cisco Call Manager (CUCM), Cisco Collaboration Endpoints, and global IP Telephony deployments across Group offices and sites.
- Troubleshoot complicated issues of CUCM / Cisco Collaboration Endpoints / ISE / Firewalling, focusing on voice quality, SIP signaling,...