On my HSM alert configuration setting, the word "siren" is not shown, and where "siren" should be there is a sequence of five decimals (comma separated) which are the decimal form of the ASCII characters that spell siren.
If I change the configuration of my alert to siren and strobe, then the correct text appears. If I change the alert configuation to just strobe, then I get the ASCII again (for "strobe").
Examples:
As expected, when both siren and strobe are checked:
Not expected, when just siren is checked:
