The exercise, carried out near Seattle, is designed to see how staff and systems respond to a disaster that affects data-routing or voice-switching centres.
A spokesman for the telco said day one of the test was on the third anniversary of the earthquake that hit the Puget Sound area.
Over the past decade, AT&T says it has invested more than $300 million in its disaster recovery program
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iTnews Executive Retreat - Security Leaders Edition
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