A misconfigured network element took the mobile network down, with full service restored only after at least 12 hours. More than 25,000 calls to 911 were blocked.
What it came down to
A change to the core network with no peer review, inadequate testing and too few controls on changes.
For an agent, with TraceMem
Every change an agent proposes to a live system waits for an engineer with change authority, and is on the record before it is reported done.
Policy and Exceptions