Based on the telephone bills and/or the billing files we identify the organization's traffic matrix. We are able to identify large traffic matrixes (above 1000 sources and destinations) organizing them by volume and by value.

In addition of that, we recalculate the telephone bills using several pricing strategies from several service providers identifying which service provider and pricing strategy is more suitable for the organization's specific needs. Additionally we check the feasibility of using a private voice or an integrated (voice and data) network.

An analysis such this one identifies the following:

• Amount $ effectively paid by the organization for its voice services (Consolidated telephone bill);
• Amount $ supposed to be charged;
• that could be charged if the provider was A, B or C;
• Amount $ of the bill if we always select the service provider provides the best deal for each specific call.

With these results is possible not only to avoid billing errors but also identify within which parameters fidelity agreements with service providers are interesting. Through these studies we are also able to identify the attainable gains achieved through the correct selection of service providers and compare it with the effort to configure properly the PBXs. Moreover, We produce the PBXs configurations.