For instance, Voice over Internet Protocol (VoIP) technology seems to be a promising and cheap alternative to traditional voice services.Hence, operators have been pushed to explore new opportunities such as content provisioning, to expand their offers in order to sell value-added services that would lead to higher profit margins [8]. However, while telcos have been making huge network investments and migrations for years, new IT competitors can offer similar services in the near future, more closely integrated with the plethora of information services available on the Web.