Core responsibility is administering, provisioning, and troubleshooting Cisco Call Manager (CUCM), Cisco Unity Connection voicemail, Unified Contact Center Express (UCCX), Cisco Emergency Responder, Expressway, Jabber, WebEx Calling, and conferencing integrations with WebEx and Microsoft Teams. Working familiarity with core IP networking concepts (LAN/WAN, VoIP, routing basics) as they relate to voice traffic - this role coordinates with network engineering rather than owning routing/switching design.