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

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

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