Abstract: A method of providing an intra-company voice communication service has the general steps of providing a company with a plurality of remote geographic facilities linked by a data network, determining a call traffic pattern for each of the facilities by analyzing a call detail record for each facility, determining performance specifications for the data network, and providing and implementing a converged digital telephony data network. Through the method of the invention, a service may thereby be provided that allows for a company to eliminate public telephone carrier service charges for intra-company phone calls between remote facilities. A preferred embodiment of the method of the invention utilizes the World Wide Web for carrying out various of the steps of the invention to achieve time and travel savings.