The Wide Area Interoperability System (WAIS) takes advantage of Voice over IP (VoIP) to connect dispersed communications efforts via an existing infrastructure, such as a Local Area Network (LAN), Wide Area Network (WAN) or the Internet, itself.
The [ACU-1000] solution recently implemented in southeastern Louisiana significantly improves the ability of participating agencies to communicate with each other in joint response situations. Ultimately, it will help ensure greater emergency preparedness and response in the maritime region." NOMIC