WASHINGTON, Oct 22 (Reuters) - The Federal Communications
Commission (FCC) said a June nationwide T-Mobile outage
resulted in at least 250 million calls failing.
FCC chairman Ajit Pai said a staff report released on
Thursday found the company did not follow several established
network reliability best practices that could have potentially
prevented or mitigated the outage.
"T-Mobiles outage was a failure," Pai said.
The June 15 outage on T-Mobile's U.S. wireless networks
lasted over 12 hours, disrupting calling and texting services
nationwide and access to data service in some areas, the FCC
said, adding at least 41% of calls on T-Mobiles network failed
during the outage.
T-Mobile said it takes its "commitment to keep our customers
connected seriously" and added it took "necessary steps to
address the issues that created the service interruption."
The FCC staff report said the outage was caused "by an
equipment failure and then exacerbated by a network routing
misconfiguration that occurred when T-Mobile introduced a new
router into its network."
The FCC said the "outage was magnified by a software flaw in
T-Mobiles network that had been latent for months and
interfered with customers' ability to initiate or receive voice
calls during the outage."
The FCC staff report said there were at least 23,621 failed
emergency calls to 911 as a result.
T-Mobile said its network experienced an 18% reduction in
completed calls during the outage.
The FCC said the figure did not address the full problem.
"T-Mobile acknowledges that network congestion likely
required many of its subscribers to make 2-3 call attempts
before successfully connecting," the report said.
The FCC estimated "that over 250 million calls ... from
other service providers subscribers to T-Mobile subscribers
failed due to the outage" and "at least 41% of all calls that
attempted to use T-Mobiles network during the outage did not
T-Mobile in April officially completed its $23 billion
merger with Sprint, solidifying its position as the No.3
wireless provider in the United States. The FCC said legacy
Sprint customers were unaffected by the outage.
(Reporting by David Shepardson,
Editing by Chris Reese and Andrea Ricci)