CA Service Desk Manager (formerly Unicenter Service Desk), from Computer Associates, is a solution that provides a ticketing system, among other features. The following would be configured as the message body:
"start-request"
%CUSTOMER= <some existing user account>
%DESCRIPTION= {DATE} - {TIME}
{TRIGGER.NAME}.
%SUMMARY= {TRIGGER.NAME}.
%PRIORITY= {TRIGGER.NSEVERITY}
%CATEGORY= <some existing category>
"end-request"
Use the {TRIGGER.NSEVERITY} macro here—that's numeric trigger severity, with Not classified being 0 and Disaster being 5.