Garmin CIRRUS PERSPECTIVE SR22T Reference Manual page 107

Additional Features
Internal External
Description
Phone Phone
Phone is Idle
Phone is ringing
Phone has a dial tone (off hook) or connected to
another phone
Phone dialed is busy
Phone is dialing another phone
Phone has failed
Phone status not known
Phone is disabled
Phone is reserved for data transmission
Calling other phone or incoming call from other phone
Other phone is on hold
Phones are connected
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Cirrus Perspective ™ by Garmin – Cockpit Reference Guide for the SR20/SR22/SR22T