Threema calls: What do those sounds mean?

 Ringing: The phone is ringing at the recipient’s end.

 Busy: The recipient either rejected your call or is already talking on the phone to someone else.

 Pickup: A connection has been established; you can talk to the callee.

 Hangup: The connection was dropped.

 Problem: The connection has been interrupted; an attempt to re-establish the connection is in progress.

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