originationIdentity
The origination identity to use, such as PhoneNumberId, PhoneNumberArn, SenderId, or SenderIdArn. You can use DescribePhoneNumbers to find the values for PhoneNumberId and PhoneNumberArn, while DescribeSenderIds can be used to get the values for SenderId and SenderIdArn.
If you are using a shared AWS End User Messaging SMS and Voice resource then you must use the full Amazon Resource Name(ARN).