[jacquesm]

> The new sound is even worse (and seemingly longer), and I imagine it's signal (which sounds more like fax machine squelches than an alert noise) has been crafted to prevent incidents like you describe.

The evil part of me wonders if a replay attack would work for that more complex signal or whether it contains something tied to the current date.

The problem with emergency measures is they have to work in circumstances when you can't rely on other stuff any more which means they have to be as simple as possible.