public Termination withCallingRegions(java.util.Collection<String> callingRegions) {
        setCallingRegions(callingRegions);
        return this;
    }
<p>
The countries to which calls are allowed, in ISO 3166-1 alpha-2 format. Required.
</p>

@param callingRegions
       The countries to which calls are allowed, in ISO 3166-1 alpha-2 format. Required.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-chimesdkvoice/src/main/java/com/amazonaws/services/chimesdkvoice/model/Termination.java