AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 140)

Audible Signals
MD Evolution – Cordless DT412 / DT422 / DT432 140
Service Acceptance tone
Heard when a request for service is accepted on your extension.
Multi-toned melody, continuous
Appointment Reminder notification
Heard following your response to an appointment reminder, this
announcement indicates the nature of this automatic system call.
See section “ More Features on your Extension ” on page 103
Message: “It’s time for your appointment.”.