# Senior Voice Engineer **Company**: Leidos **Location**: 6314 Remote/Teleworker US **Work arrangement**: remote **Experience**: senior **Job type**: full-time **Category**: Engineering **Industry**: Technology **Apply**: https://leidos.wd5.myworkdayjobs.com/en-US/External/job/6314-RemoteTeleworker-US/NEN-Solution-Engineering---Senior-Voice-Engineer_R-00196137?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply **Canonical**: https://yubhub.co/job/senior-voice-engineer-9470d42b-513/ ## Description We are seeking a highly technical, hands-on Senior Voice Engineer to join our Unified Communications and Collaboration (UC&C) Solution Engineering team. This role is focused on deep technical execution rather than people management. The engineer will design, secure, and troubleshoot complex voice environments, owning the hardest Tier 3/Tier 4 escalations involving SIP dialog analysis and advanced call flows, and partnering with the dedicated LAN/WAN, Virtualization, and Cybersecurity teams when issues cross into their domains. The position is also accountable for verifying that voice and UC systems meet DISA Security Technical Implementation Guide (STIG) requirements. **Key Responsibilities** **SIP Signaling and Advanced Call-Flow Troubleshooting** - Serve as the senior escalation point for complex voice incidents, analyzing complete SIP dialogs to isolate signaling failures across multi-hop call paths. - Troubleshoot and resolve issues in complex scenarios, including attended and blind transfers, call forking, hunt and pilot groups, conferencing, call park, shared lines, simultaneous ring, emergency calling, and cloud/hybrid routing through multiple Session Border Controllers (SBCs). - Diagnose offer/answer and codec negotiation failures, early media, DTMF mismatches, SRTP key exchange problems, one-way and no-way audio, and media anchoring or bypass issues. - Interpret and manipulate SIP headers and develop SBC message manipulation and normalization rules to resolve interoperability problems between carriers, call-control platforms, and cloud services. - Use Wireshark/TShark, SBC debug and trace tools, call-control platform traces, call-detail records, and ladder diagrams to reconstruct call flows and document root cause. - Deliver written root-cause analyses with permanent corrective actions, and feed lessons learned into design standards and operating procedures shared across supported contracts. **STIG Compliance and Voice Security** - Perform and document compliance assessments of voice, UC, and SBC systems against applicable DISA STIGs and Security Requirements Guides (SRGs). - Use DISA STIG Viewer, Security Content Automation Protocol (SCAP) Compliance Checker, Evaluate-STIG, and authenticated vulnerability scans to produce and maintain STIG checklists and validate findings. - Develop and implement remediation for open findings, harden configurations, and build secure configuration baselines that remain compliant through upgrades and changes. - Provide voice-specific technical input to the Cybersecurity team for Risk Management Framework (RMF) packages, POA&Ms, and Authority to Operate (ATO) activities. - Implement and troubleshoot SIP over TLS, mutual TLS, SRTP, certificate and PKI management, and secure trunking to carriers and cloud platforms. **Layer 2 and Layer 3 Networking for Voice (in partnership with LAN/WAN teams)** - Apply working knowledge of voice VLANs, 802.1Q trunking, Spanning Tree, LLDP-MED/CDP, Power over Ethernet, and 802.1X/MAB to troubleshoot endpoint registration and call-quality issues. - Understand routing behavior to identify when routing or asymmetric paths are breaking signaling or media. - Resolve SIP and RTP traversal issues at SBC demarcation points, and specify firewall, NAT, and port requirements for voice to the network and security teams. - Define voice and video QoS requirements and validate end-to-end QoS behavior with the LAN/WAN teams. - Isolate packet loss, jitter, latency, and MTU issues affecting voice using packet captures, interface statistics, and call-quality metrics. **Voice Platform Engineering and Delivery** - Author and review high- and low-level designs, implementation procedures, test plans, and rollback plans for voice and UC solutions. - Architect and integrate IP telephony, SIP trunking, and SBC platforms. - Architect enterprise dial plans, E.164 normalization, digit manipulation, route patterns, and carrier and PSTN interconnections. - Design integrations with Microsoft Teams Phone, Webex Calling, and comparable cloud platforms. - Mentor and guide the technical work of other engineers through design reviews, peer review of configurations, and knowledge transfer. - Lead technical engagements with manufacturers, carriers, and SIP service providers on complex defects and interoperability issues. **Cross-Program Technical Authority** - Serve as the voice engineering subject matter expert for multiple DoD contracts, prioritizing technical work across programs. - Develop common voice architectures, STIG-compliant baselines, and SIP normalization standards that can be applied consistently across contracts and customers. - Contribute to technical roadmaps, modernization strategies, and capture or proposal efforts. - Brief program managers, government customers, and executive leadership on technical risks, recommendations, and solution tradeoffs that affect program goals. **Required Experience and Education** - Bachelor's degree and 12 or more years of relevant experience, or a Master's degree and 10 or more years, in VoIP, enterprise telephony, unified communications, network engineering, or a closely related discipline. - Active Secret clearance required. - Ability to obtain an IAT Level II certification within the period required by the contract. - Expert-level, hands-on experience analyzing SIP dialogs and SDP negotiation in packet captures and platform traces to resolve complex, multi-hop call-flow failures. - Demonstrated experience performing DISA STIG compliance checks, completing STIG checklists, and remediating findings on voice, UC, or network infrastructure. - Solid working knowledge of enterprise switching and routing, sufficient to troubleshoot voice issues at the network layer and work effectively with dedicated network teams. - Hands-on experience with at least one enterprise call-control platform and at least one enterprise SBC. - Ability to explain complex technical issues, risks, and recommendations clearly to engineers, customers, and program and executive leadership. **Preferred Technical Proficiencies** - Advanced knowledge of SIP, SDP, RTP/RTCP, SRTP, TLS, H.323, MGCP, and ISDN/PRI. - Experience with DISA STIG Viewer, SCAP Compliance Checker, Evaluate-STIG, ACAS/Tenable Nessus, and RMF artifacts. - Familiarity with SD-WAN, MPLS, and carrier transport as they affect voice and video quality. - Familiarity with VTC and collaboration endpoints. - Scripting experience with Python, PowerShell, or REST/AXL APIs. - Experience supporting large-scale, geographically distributed, highly available DoD or mission-critical voice networks. **Preferred Certifications and Qualifications** - Cisco Certified Network Professional (CCNP) Collaboration or Cisco Certified Internetwork Expert (CCIE) Collaboration. - Cisco CCNA or equivalent networking certification. - CompTIA Security+ CE or other DoD 8140 IAT Level II certification. For more fresh new jobs, check out [yubhub.co](https://yubhub.co/). ## Skills ### Required - SIP - SDP - RTP/RTCP - SRTP - TLS - H.323 - MGCP - ISDN/PRI - Wireshark/TShark - SBC - DISA STIG - SCAP - Evaluate-STIG - ACAS/Tenable Nessus - Python - PowerShell - REST/AXL APIs ### Nice to have - SD-WAN - MPLS - VTC - collaboration endpoints - scripting --- Source: [Apply at leidos.wd5.myworkdayjobs.com](https://leidos.wd5.myworkdayjobs.com/en-US/External/job/6314-RemoteTeleworker-US/NEN-Solution-Engineering---Senior-Voice-Engineer_R-00196137?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)