The Enterprise Voice Engineer II joins the team to provide sustainment, maintenance, and problem management for the Defense Information System Network. This role focuses on ensuring the reliable availability of secure voice services by managing a complex IP voice and video communications infrastructure. Day-to-day responsibilities include configuring route plans, performing fault analysis on call handlers, and executing configuration changes for large-scale systems. The engineer will utilize Cisco and Juniper routing and switching devices, manage distributed firewall infrastructure, and resolve issues involving SIP signaling and call flows. Required technical skills include experience with Cisco Unified Communications Manager, Cisco Unity, Cisco Unified Border Element, Oracle Session Border Controllers, and Avaya Aura platforms. The role addresses the critical need for secure, uninterrupted communication systems within a high-resiliency network environment, requiring expertise in SRTP, G.711/G.729 codecs, and BGP routing protocols.