Senior Network Voice Engineer - TS​/SCI Clearance

The Senior Network / Voice Engineer will support enterprise network and voice communications infrastructure within a secure federal environment. This role requires an active TS/SCI clearance and is ideal for a candidate with a strong foundation in core network engineering who also has hands‑on experience supporting voice systems, VoIP platforms, unified communications services, and voice equipment moves, adds, and changes. The position will focus on reliable day‑to‑day operations, technical troubleshooting, equipment configuration, user support, documentation, and coordination with network, telecom, cybersecurity, and mission stakeholders.

• Perform moves, adds, changes, and deletions for voice equipment, user extensions, voicemail accounts, phones, call routing, hunt groups, shared lines, and related telephony services.
• Install, configure, maintain, and troubleshoot IP phones, analog voice devices, voice gateways, call managers, session border controllers, voicemail systems, and unified communications components.
• Support day‑to‑day voice operations, including provisioning, incident response, ticket resolution, user support, endpoint replacement, and coordination of voice service requests.
• Troubleshoot voice quality and connectivity issues, including one‑way audio, dropped calls, registration failures, latency, jitter, packet loss, codec mismatch, dial‑plan issues, and PSTN/SIP trunk problems.
• Support core network engineering tasks, including LAN/WAN connectivity, VLANs, routing, switching, firewall coordination, QoS, network segmentation, and secure network access.
• Implement and maintain QoS policies to prioritize voice traffic across LAN, WAN, and wireless environments.
• Coordinate with carriers, vendors, government customers, and internal technical teams to support circuit issues, number assignments, porting activity, trunk configuration, and service restoration.
• Create and maintain accurate documentation for voice infrastructure, phone inventories, extension assignments, dial plans, call flows, topology diagrams, standard operating procedures, and change records.
• Plan and execute approved network and voice changes through established change management processes while minimizing risk to mission operations.
• Support cybersecurity and compliance requirements by maintaining secure configurations, assisting with vulnerability remediation, supporting audit requests, and following federal security standards and operational procedures.
• Provide technical guidance to junior technicians or support staff for voice endpoint configuration, troubleshooting steps, and escalation procedures.

• Active TS/SCI clearance required.
• U.S. citizenship required due to federal security requirements.
• Hands‑on experience supporting enterprise network and voice infrastructure in federal, defense, intelligence, or similarly secure environments.
• Experience performing voice moves, adds, changes, and deletions for IP phones, extensions, voicemail, call routing, hunt groups, shared lines, and related telephony services.
• Working knowledge of VoIP technologies, SIP, RTP, QoS, dial plans, gateways, trunks, voicemail systems, and unified communications platforms.
• Strong understanding of core networking concepts, including TCP/IP, subnetting, VLANs, routing, switching, LAN/WAN connectivity, network segmentation, and troubleshooting.
• Experience supporting Cisco or comparable network and voice technologies, such as Cisco Unified Communications Manager, Unity Connection, voice gateways, IP phones, CUBE/SBCs, routers, and switches.
• Ability to troubleshoot voice and network issues using logs, packet captures, monitoring tools, call traces, command‑line diagnostics, and vendor support resources.
• Familiar…