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DEFENSE SWITCHED NETWORK (DSN)

As approved by OSD, the DSN is an interbase, non-secure or secure C2 telecommunications system that provides end-to-end command use and dedicated telephone service, voice-band data, and dial-up VTC for C2 and non-C2 DoD authorized users in accordance with national security directives. Non-secure dial-up voice (telephone) service is the system's principal requirement.

The primary function of the DSN is to provide non-secure dial-up voice service. The DSN provides rapid, reliable, survivable, non-secure / secure, and economical C2 telecommunications. To take advantage of economies of scale, the DSN also provides service to non-C2 users on a not-to-interfere basis.

The DSN system is used only for official business or in the interest of the government and is the first choice for all switched voice and dialup video telecommunications between DoD user locations.

	Using the DSN Guidance on how to make a call, using commercial toll free services, security guidelines, and other helpful information.		Connecting to the DSN Policy and procedures governing connection approval of telecommunications products.
	Information Assurance A central repository of voice system related security information.		Configuration Management An overview of the effort to maintain end-to-end Configuration Management of the DSN.
	General Information A general overview and history of the DSN.		Emerging Technology Keeping users apprised of new technologies and/or issues that may affect the DSN.