The delivered mapping for the phone numbers of a SCIM user works only in read-only direction. As soon as the user has several telephone numbers (mobile network and landline), the current mapping to the complex target system property "phoneNumbers" does not work.
This is a product defect (32831).
This will be fixed on a future release of the product. If you require this immediately corrected, please contact support for a hotfix referencing the defect ID 32831.