The requirements stated by dtms were fairly stringent, as the new billing solution was to constitute the support for the extended supply chain with separate pricing of services for individual customers. In addition, it had to support many of the advanced Intelligent Network products (service numbers – free phones, premium rates, etc. – virtual call centers, internet payments, chat-conferencing, access control) and settlement methods (credits, pre-payments, refunds). Finally, real-time processing was required to enable automatically publishing billing data on the Web. The Comarch BSS Suite was the only billing solution capable of fulfilling all the dtms requirements.