Getting European Ringtone in 3CX app to internal calls

[phirephoto]

Hi All,

Running 3cx Free. On the 3cx iPhone app, I'm getting the 'european' ringtone when calling other internal extensions. Seems to be fine for external calls.
Is there a setting I'm missing for that?
(To clarify, not the ringrtone on the ringing phone, but what I hear on the 3cx App when the line is ringing - it's the dual ringing - ring ring -------- ring ring ----


Thanks