public void setCallerId(String callerId) {
        this.callerId = callerId;
    }
The phone number that appears on recipients' devices when they receive the message.

@param callerId
       The phone number that appears on recipients' devices when they receive the message.
aws-java-sdk-pinpointsmsvoice/src/main/java/com/amazonaws/services/pinpointsmsvoice/model/SendVoiceMessageRequest.java