The Defense Information System Network (DISN) provides global voice services through the Defense Switched Network (DSN), a worldwide private-line telephone network. Multilevel precedence and preemption (MLPP) capabilities on the DSN utilized by command and control users ensure that the highest-priority calls achieve connection quickly, especially during a crisis situation. The DSN also provides global data and video services using dial-up switched 56 kbps or 64 kbps Integrated Services Digital Network (ISDN) services. Secure voice services are provided by the Secure Telephone Unit, Third-Generation/ Secure Terminal Equipment (STU-III/STE) family of equipment that provides end-to-end encryption over nonsecure DSN circuits. Interfaces are provided between strategic and tactical forces, allied military networks and Enhanced Mobile Satellite Services (EMSS).

The military services and agencies in the Department of Defense (DoD) are authorized users, but other federal government departments and agencies, allies and DoD contractors can also use the DSN if approved by the Joint Staff (in accordance with CJCSI 6215.01).

For more information, go to “DISA Direct,” an e-business ordering and tracking system at www.ditco.disa.mil/products/ASP/welcome.ASP.

Contact your telecommunications control officer to expand service at an existing location, or contact the DSN service manager for new service activation.

For more information on the DISN, go to http://www.disa.mil/ns/disn/disn_services.html.