Joint Base McGuire-Dix-Lakehurst

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The Defense Service Network, DSN, is the primary long-distance telecommunications system for the Department of War.

To successfully route calls, you must use an authorized installation-grounded military phone and apply the correct regional DSN area codes and dialing prefixes

Core Dialing Rules & Restrictions

• Cell Phone Restrictions:
  • Standard personal cell phones cannot dial DSN numbers directly. Calls must originate from a military installation phone.
• Authorized Hardware:
  • You must utilize a physical military landline; an authorized enterprise VoIP, or EVoIP; desk phone; or a provisioned softphone on a secure network.
• Toll & Collect Calls:
  • Do not accept collect calls on a DSN line.
  • Official calls to commercial toll-free numbers (800, 888, etc.) can be placed using 94 + the 10-digit toll-free number.

Regional DSN Area Codes

DSN routing is divided into global geographic zones. Use the table below to identify the correct DSN area code when calling outside your local installation

• Region: CONUS, or Continental United States
  • DSN Area Code: 312
  • Dialing Protocol: Omit the area code when dialing station-to-station within the U.S.
• Region: Europe
  • DSN Area Code: 314
  • Dialing Protocol: Must include area code if dialing to/from this region
• Region: Pacific (Japan, Korea, Hawaii, Guam)
  • DSN Area Code: 315
  • Dialing Protocol: Must include area code if calling from outside the Pacific
• Region: Central Command (Southwest Asia)
  • DSN Area Code: 318
  • Dialing Protocol: Must include area code if dialing to/from this region
• Region: Africa
  • DSN Area Code: 324 / 495
  • Dialing Protocol: Must include area code if dialing to/from this region

Step-by-Step Dialing Workflows

Use these step-by-step procedures to route your call based on location and priority

• Call Type: U.S. Installation to U.S. Installation
  • Dialing Sequence: Dial only the 7-digit local DSN number
  • Example: 555-1234
• Call Type: CONUS to Overseas (OCONUS)
  • Dialing Sequence: Dial local protocol + DSN Area Code + 7-digit DSN number
  • Example: 94 + 315 + 555-1234
• Call Type: Overseas (OCONUS) to CONUS
  • Dialing Sequence: Dial local protocol + 312 + 7-digit DSN number
  • Example: 94 + 312 + 555-1234
• Call Type: U.S. Toll-Free (800, 833, 844, 855, 866, 877, 888)
  • Dialing Sequence: Dial 94 + 10-digit commercial toll-free number
  • Example: 94-800-555-1212

Precedence Dialing Protocols

For official communications requiring urgent or preferential routing, dial the corresponding prefix before the area code:

• Routine (94): Standard official government communications
• Priority (93): Expeditious action requiring essential information for military operations
• Immediate (92): Critical situations gravely affecting national security or Allied forces

Common Pitfalls & Watch-Outs

• Forgot the Prefix: Many installation switchboards require dialing a local access digit (commonly 94 or 99) to reach the outbound long-distance DSN network. Ensure you listen for a secondary dial tone if required.
• Wrong Area Code: Dialing a "312" area code while calling a local U.S. number on the same installation can cause routing failures or slow connections. Keep local calls to 7 digits.
• Operator Assistance: If you encounter issues routing a call, the centralized DSN/commercial operator can be reached at commercial 719- 567-1110.