Dear sirs, i can do this job for you!
sounds like a telecoms billing system with mediation-device(importing cdr), rating device (accounting calls depending on geo-zones and time-zones) and a fraud-management include frontends for administration (customer-management, tariff-management ...).
i have done severeal similar jobs for telecom companies (billing solutions with more than 1.000.000.000 calls per day). so dont hesitate to contact me!