The Communications Workers of America made the announcement after the existing labor contract just before midnight Saturday.
CWA spokesman Al Kogler said in a statement that negotiations will continue and workers will remain on the job during the extension.
Kogler has said the union opposes a proposed increase in health care premiums and wants to bring more jobs back to the U.S. The union had authorized a strike in the event that a new deal couldn't be reached with the Monroe, La.-based telecommunications company.
CenturyLink workers in Montana, who are negotiating a separate contract, agreed to the extension.
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