voip France Telecom buggy
a transponder that transfers voip calls to the normal telephone network of France Telecom was buggy so it added a zero to each number called, and thousands of calls were affected. The commuteurs were put automatically on self defense and kept all the numbers (even the bad ones) in memory. But during the weekend the wrong numbers were made again and a buffer overflow had huge effects on the telephone network.
the solution was as easy as installing a patch, somebody tested anything ?