Systems Engineer Herndon, VA CB-SE-HRN-013 We are seeking an experienced Cisco Voice Engineer to support a mission critical, technology driven program for a key Government customer. This role focuses on designing, deploying, securing, and sustaining enterprise level Cisco Unified Communications solutions across a complex, highly secure environment. Key responsibilities: • Design, test, and deploy new Cisco Voice infrastructure (CUCM, Unity Connection, IM&P, UCCX). • Implement next generation voice system technologies and support first article engineering. • Participate in security accreditation activities for all voice systems. • Manage PKI/certificate requirements across Cisco UC components. • Perform system upgrades, patching, and lifecycle maintenance for hardware and software. • Provide engineering support for new site standups, including dial plan design and endpoint provisioning. • Design, test, and deploy call center technologies (UCCX/UCCE), including user training and transition planning. • Execute tasks related to call routing, SIP trunking, SRST, CUBE, and gateway configuration. • Collaborate with customers and internal teams to gather and refine system requirements. • Ensure compliance with enterprise standards, policies, and security procedures. • Work within a large scale enterprise IT environment with responsibilities specific to Cisco Voice and Unified Communications. • Partner with network engineering and telecom teams on integration activities involving telephony, call center systems, and network infrastructure. • Support secure communications devices and infrastructure, including VoIP phones, STEs, Viper phones, encryption devices, POTs/ISDN/leased lines, conference bridges, and call management servers. Required Education & Experience: • Bachelor's or Master's degree in Computer Science, IT, Engineering, or related field • Minimum of six (6) years of relevant Voice/UC engineering experience • Strong technical expertise in: o SIP signaling and call flows o Secure Real Time Transport Protocol (SRTP) o SIP, MGCP, H.323 o TCP/IP networking o MPLS transport environments o DNS and DHCP o RTP media handling • Experience supporting secure, enterprise scale voice environments • Ability to troubleshoot complex call routing, signaling, and interoperability issues • Strong communication skills for documentation, requirements analysis, and customer interaction Preferred Education, Experience, & Skills: • Advanced expertise in SIP signaling, call flows, and multi vendor integration • Experience with H.323 in mixed protocol environments • Cisco Certified Collaboration Professional (CCCP) or equivalent Cisco Collaboration certifications: o CCNP Collaboration o CCIE Collaboration (highly desirable) • Avaya Communications Certification or experience supporting Avaya platforms in hybrid Cisco/Avaya environments • Experience with secure communications devices (VoIP endpoints, STEs, Viper phones, encryption devices) • Familiarity with government security accreditation processes and PKI/certificate management • Experience designing or supporting call center technologies (Cisco UCCX/UCCE or Avaya equivalent)