The Offer and Product Configuration function enables the configuration of the commercial offer chosen by the customer (period of engagement for example) and the products it markets (for examples: telephone number, quantity of SMS/MMS, hours of voice calls, ...). The configuration covers the choice of optional offers and products, the choice of the functions values, etc. It can be based on product configurator using a rule engine. It can be used at the same time by Selling, Order Establishment or Develop Sales Proposal Business activities.