APPLE-SIRI
This signature detects the Apple Siri application being used. Siri is a natural-language voice recognition system used to interact with Apple iPhone and similar products in order to find information, make appointments, set reminders, and similar personal assistant functions.
Available to all SRX running 12.3X48+
Available to all MX running 20.2R1+
Available to all vSRX running 20.3R1+