originationIdentity

The origination identity to use such as a PhoneNumberId, PhoneNumberArn, PoolId or PoolArn. You can use DescribePhoneNumbers to find the values for PhoneNumberId and PhoneNumberArn and DescribePools to find the values of PoolId and PoolArn.

If you are using a shared AWS End User Messaging SMS and Voice resource then you must use the full Amazon Resource Name(ARN).