MSDP has well defined interfaces that can be used with OCS – Online Charging System. The fraud that you have mentioned is probably initiated by internal miscreants. A FMS solution coupled with Analytic / Machine Learning will help to “weed out” internal users who are assisting with fraud.
To help, users who operate OCS, MSDP, etc.. should be provided with a security zone setting. Their actions can be logged and tracked.
VBR/ Wallis Dudhnath