I. Introduction
Both IP multimedia communication and telecommunication industries generate and store huge amount of high-quality data, which can be used to extract relevant information related to business specific parameters. These data are classified as: call detail data, network data and customer data [1]. Due to the size of data, a human analysis is not possible. Therefore, nowadays, telecommunication companies utilize data mining on communication data, to improve their marketing efforts, identify fraud and optimize their network equipment infrastructure [2].