The sequence of tones to influence telephone switchboards were known as well. It was the origin of hacking. This may be an easy hack, but it still is one. BTW,

The sequence of tones to influence telephone switchboards were known as well. It was the origin of hacking. This may be an easy hack, but it still is one. BTW, it's good that attention is being called to it. There is a bit of tension in the region, as you may know, and opponents are not going to play nice. That also makes me suspect this was not a malicious attack.