We were informed that the Intelligence API has been migrated from On-Premises to On-Cloud.
https://developer.telesign.com/enterprise/changelog/intelligence-cloud-api-launched-details-about-migration-for-intelligence-customers
But the current PHP SDK release still uses the old $rest_endpoint in src/score/ScoreClient.php, i.e. https://rest-ww.telesign.com
Requesting for migration to the new endpoint https://detect.telesign.com/intelligence/phone