to user behaviour it activates three levels of intervention;
PASSIVE: In response to the user raising their voice
to an excessive level the phone, in the first instance, shows it
annoyance by intermittently providing aural feedback of their voice.
This passive intervention serves to remind the user of the
inappropriate nature of their call.
ASSERTIVE: If the user continues to speak loudly
it becomes more assertive and gently begins to vibrate.
AGGRESSIVE: Continuous loud talking prompts the
phone to take an aggressive stance to hinder the progress of the
call by vibrating frenetically whilst increasing the aural feedback.