originationIdentity

The origination identity to use such as a 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.

After the pool is created you can add more origination identities to the pool by using AssociateOriginationIdentity.

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