Abstract: A method for developing a call traffic pattern for a company having a plurality of remotely located facilities is disclosed. A long distance carrier phone bill is examined to determine which call records correspond to intra-company calls. The intra-company call records are then grouped by originating company facility. Data from the grouped call records are then summed and examined to assemble a call traffic pattern. The call traffic pattern may include total charges for intra-company calls by facility, total calls by facility, total call duration by facility, peak phone usage by facility, and time of peak usage by facility. The call traffic pattern may be particularly useful in designing a voice over data network solution for a company.