public String getOriginationPhoneNumber() {
        return this.originationPhoneNumber;
    }
The phone number that Amazon Pinpoint should use to send the voice message. This isn't necessarily the phone
number that appears on recipients' devices when they receive the message, because you can specify a CallerId
parameter in the request.

@return The phone number that Amazon Pinpoint should use to send the voice message. This isn't necessarily the
        phone number that appears on recipients' devices when they receive the message, because you can specify a
        CallerId parameter in the request.
aws-java-sdk-pinpointsmsvoice/src/main/java/com/amazonaws/services/pinpointsmsvoice/model/SendVoiceMessageRequest.java