How to: DSN Call
A DSN, also known as Defense Switched Network, was developed by the Department of Defense to secure reliable long-distance communication between agencies. This dial-up network can be used by anyone, not just the DD. A DSN call is for official business only, not for personal calls. Agencies can make DSN calls using specified numbers. However, civilians must utilize an operator to place a successful call.
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Instructions
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Research the DSN area code for the part of the world where you would like to place the call. You have to know this three-digit number before you can place a DSN call.
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Dial the local DSN operator if this is a civilian call. Otherwise dial the specific DSN number if this call is within an agency network.
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Give the operator the commercial number you wish to call. He or she will transfer you by using DNS and local switchboard lines.
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Wait a few seconds, and you should be connected to your party.
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