This profile will let you change the ringtones on every new call you get. I am assuming that we have just three ringtones to change. If you have more, you can make changes accordingly.

Ringtone xxx If %COUNT = 0
Ringtone yyy If %COUNT = 1
Ringtone zzz If %COUNT = 2
Add Var %COUNT, 1
Set Var %COUNT 0 if %COUNT > 2

Run the task on Event: Phone Ringing

p.s. Ringtone is in the Media category

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