Knowledge and experience with configuration and maintenance of: gateways, routers, switches, firewall, DNS, DHCP, network servers, multiplexers, calling card platforms, TDM, Dialogic, VoIP systems (SIP, H.323 protocols, dial peers, and VoIP carrier trunking). Provide in‐depth engineering analysis of telecommunications alternatives for government public safety agencies in support of strategic modernization efforts and telecommunications enhancement design for medium and large scale telecommunication infrastructures to include 9-1-1.