- No fall-back system in place.
- Alternative alert system did not work.
- Alternative alert went out with the wrong information.
That seems plenty to me.
As far as the siren is concerned: the general alert system is meant for serious threats to public safety, it does not require 'a new phone number in morse', the output is a single bit: siren on: stay indoors, close doors and windows, wait for all clear sign (three short bursts on the siren).