HOW THE VoIP ENGINEER WILL MAKE AN IMPACT: We are seeking an experienced VoIP Engineer to design, implement, secure, and support enterprise voice and collaboration systems in geographically dispersed environments. The ideal candidate has deep expertise in large-scale Cisco Unified Communications and delivers secure, reliable voice and video services supporting mission-critical federal and defense operations. Key Responsibilities Engineer and administer Cisco UC platforms including CUCM, Unity Connection, Expressways, Jabber, and related systems across NIPR/SIPR and VoSIP networks. Monitor, maintain, and optimize UC systems for performance and availability using RTMT and SolarWinds. Perform system upgrades, migrations, and patching for UC infrastructure, including Cisco UCS, VG450 gateways, and VMware environments. Implement DISA STIGs, remediate ACAS findings, and maintain DoD cybersecurity compliance. Provision and deploy telephony devices, including BAT files, templates, and automation workflows. Develop and maintain technical documentation such as system designs, installation guides, and operational procedures. Collaborate with network, cybersecurity, and infrastructure teams to resolve complex UC issues. Conduct site surveys, produce as-built documentation, and recommend design improvements for scalability and security. Provide Tier II/III support, user training, and end-user documentation. Support planning and deployment of new UC services and contribute to technology roadmaps.