One of the more important things you need to bear in mind when setting up your LiveCall widget is to check whether you have an answering machine active. If you do, when you reject an incoming callback and your voicemail is activated, the software will treat this as an answer to the call request and so it will dial your visitor.
In order to prevent this from happening, go to Users, edit the user who has voicemail active, and check the "This number is a queue" checkbox (see below).

This number is a queue

Now your voicemail won't trigger callbacks!
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