It only works if you're sending it, so you have to put it in a ping payload, to make a "ping of death". This only works because Hayes patented the idea of the

It only works if you're sending it, so you have to put it in a ping payload, to make a "ping of death". This only works because Hayes patented the idea of the escape code being +++ followed by a delay, so to evade the patent, most other modem OEMs removed the delay requirement.