Massive AT&T Outage Affects Customers In South Pasadena

LOS ANGELES, CA — An outage Monday caused by a software glitch affected AT&T business voice customers in cities across the U.S., including Los Angeles.

In addition to Los Angeles, where Cedars Sinai-Medical Center issued an email to clients and others informing them that its land lines were "not receiving calls from the outside" due to the outage, service problems also affected AT&T business voice clients in major cities such as Dallas, Houston, Miami, St. Louis, Chicago, New York and hundreds of other areas, according to downdetector.com.

Cedars-Sinai announced about 9:40 a.m. on Twitter that it's phones were down "due to a nationwide AT&T outage." Another tweet issued at 11:09 informed that the facility was not receiving incoming calls.

At 1:11 p.m., the hospital announced that service was "returning and should be fully restored later this afternoon."

"We apologize to our customers who were affected," AT&T said in a statement that acknowledged an issue affecting some of our business voice customers."

It was not immediately clear how widely the outage -- which the company attributed to a software issue -- affected AT&T's business voice customers in Southern California.

City News Service; Image: AT&T outage map