I think that sequence is an escape for Hayes modems; do you mean that Hayes modems were less vulnerable to attacks involving it because of their guard interval

I think that sequence is an escape for Hayes modems; do you mean that Hayes modems were less vulnerable to attacks involving it because of their guard interval feature? https://en.wikipedia.org/wiki/Hayes_command_set#.2B.2B.2B https://en.wikipedia.org/wiki/Hayes_command_set#.2B.2B.2B