The Communications Workers of America (CWA) members have been working with the telecommunications firm on an extension of their previous labor contract since early February.
The union gave AT&T 72-hours notice today of a possible walk out.
"We have given AT&T every opportunity to show their commitment to finding common ground and a fair contract," VP of CWA District 1, Dennis Trainor said. "Time is running out for AT&T to stop undermining good jobs, quality customer service and its long-term success. The pieces are all in place now, and we'll strike if necessary."
"We continue to bargain with the union and remain confident a fair agreement can be reached," AT&T responded. "The contract covers good paying U.S. jobs averaging nearly $70,000 a year in pay and benefits."
Shares of AT&T closed lower nearly 1% on Friday.
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Editors' pick: Originally published April 28.