SIP/VoIP technologies, PSAP interconnections, IP routing & enterprise communications, Emergency‑services IP telephony and call‑signaling, IP routing and call‑path engineering for enterprise/DoD networks (including routing analysis, interconnection/PSAP call routing, and troubleshooting of SIP call paths), Emergency‑location provisioning and packet‑level troubleshooting (provisioning and validating location/ALI records into DoD/mission systems and performing packet‑level network/traffic analysis for fault isolation), IP routing, SIP/VoIP, E‑911/NG911, DoD/federal networks), Work on DISA VISP/PSAP provisioning and an Active Secret clearance. This position provides systems engineering and IP network support focused on emergency services routing, location information provisioning, interoperability coordination, and technical risk reduction supporting Army Public Safety Answering Point (PSAP) connectivity.