Array
(
    [errors] => Array
        (
            [0] => Array
                (
                    [type] => validation_error
                    [code] => invalid_list_items
                    [message] => Phone Numbers The items +12017200717 are invalid - Not available to assign within the project
                    [attribute] => phone_numbers
                    [url] => https://developer.signalwire.com/rest/overview/error-codes#invalid_list_items
                )

        )

)