Support enterprise contact center and telephony operations during migration to Five9 CCaaS. Administer Cisco, Microsoft Teams, Avaya, and Five9 platforms; perform provisioning, deprovisioning, MACD changes, troubleshooting, ticket management, documentation, and user support. Collaborate with IT, network, vendors, and business teams, escalating complex diagnostics to L2 engineers. Work standard Eastern-time business hours without on-call responsibilities.