AT&T says customers facing 'interoperability issue' impacting ability to call non-AT&T users has been resolved

The specific "interoperability issue between carriers" that AT&T customers experienced was an issue that impacted their ability to make and receive calls to and from non-AT&T users. This was not a nationwide outage, but rather a nationwide issue affecting the ability of customers to complete calls between carriers. The issue was resolved by AT&T in collaboration with other carriers, and it did not impact calls between AT&T users or calls to 911.

AT&T took several actions to resolve the interoperability issue that impacted its customers' ability to call non-AT&T users. Firstly, the company acknowledged the issue and provided a statement addressing the problem. AT&T then worked closely with other carriers to identify and diagnose the issue as quickly as possible.

The company clarified that the network did not experience a nationwide outage, but rather that some users across the country were affected2. AT&T also admitted to erroneously sending out a "wireless impact notification" to 911 call centers during the outage but later confirmed that nationwide 9-1-1 services were operating normally and their customers were not affected2.

AT&T's efforts to resolve the issue included collaborating with other carriers and working on identifying and implementing a solution. The Federal Communications Commission was also aware of the issue and was investigating the matter.

This incident marked the second time in three months that AT&T experienced an outage, with a similar issue occurring in late February due to a software update. The February outage had temporarily affected 911 services in several states, prompting the FCC to open an investigation into the incident.