Fort Bliss is a Strategic Deployment Platform that executes deployment operations enabling rapid and efficient unit deployment and re-deployment. Simultaneously, Fort Bliss Garrison provides facilities and services through a professional workforce that assists units in sustaining their readiness and promotes a safe and secure installation, empowering Soldiers, Families, and Civilians to thrive.

Information obtained from https://home.army.mil/bliss/about/Garrison

Defense Service Network (DSN) Dialing Instructions

The DSN is the provider of long-distance communications service for the Department of Defense (DoD). Every installation has a special DSN number and the numbers vary by world-wide location. In order to place a call using DSN, the caller must be using a military phone on an installation. Cell phones cannot dial DSN numbers. When dialing a DSN number from a United States installation to another United States installation, it is unnecessary to dial the DSN 312 area code. When dialing a DSN number to/from overseas locations, the DSN area code must be included.

DSN for 741-xxxx is 711
DSN for 742-xxxx is 712
DSN for 744-xxxx is 621
DSN for 313-xxxx is 666
DSN for 568-xxxx is 978
DSN for 569-xxxx is 979

NOTE: “xxxx” represents the last four of the telephone number. All on post calls must be dialed using seven-digit dialing. This will apply to all 568, 569 and 741, 742, 744 numbers. Exception will be JTFN 99-313-xxxx.
1) The access for local off-base calls dial 99.
2) The access code to make DSN dial 94.
3) The access code to make FTS dial 97.
4) The access code to make international dial 97011.
5) On-base emergency numbers (911) and operator assistance (0)