public void setPhoneNumberCountries(java.util.Collection<String> phoneNumberCountries) {
        if (phoneNumberCountries == null) {
            this.phoneNumberCountries = null;
            return;
        }

        this.phoneNumberCountries = new java.util.ArrayList<String>(phoneNumberCountries);
    }
<p>
The countries for proxy phone numbers to be selected from.
</p>

@param phoneNumberCountries
       The countries for proxy phone numbers to be selected from.
aws-java-sdk-chimesdkvoice/src/main/java/com/amazonaws/services/chimesdkvoice/model/Proxy.java