public PutVoiceConnectorProxyRequest withFallBackPhoneNumber(String fallBackPhoneNumber) {
        setFallBackPhoneNumber(fallBackPhoneNumber);
        return this;
    }
<p>
The phone number to route calls to after a proxy session expires.
</p>

@param fallBackPhoneNumber
       The phone number to route calls to after a proxy session expires.
@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/PutVoiceConnectorProxyRequest.java