public static AmazonChimeSDKVoiceAsyncClientBuilder asyncBuilder() {
        return AmazonChimeSDKVoiceAsyncClientBuilder.standard();
    }
Client for accessing Amazon Chime SDK Voice asynchronously. Each asynchronous method will return a Java Future object
representing the asynchronous operation; overloads which accept an {@code AsyncHandler} can be used to receive
notification when an asynchronous operation completes.
<p>
<p>
The Amazon Chime SDK telephony APIs in this section enable developers to create PSTN calling solutions that use
Amazon Chime SDK Voice Connectors, and Amazon Chime SDK SIP media applications. Developers can also order and manage
phone numbers, create and manage Voice Connectors and SIP media applications, and run voice analytics.
</p>
aws-java-sdk-chimesdkvoice/src/main/java/com/amazonaws/services/chimesdkvoice/AmazonChimeSDKVoiceAsyncClient.java