Abstract: A conference billing system with ID tagging allocates charges for a conference based on a prior reservation. The billing system also supports different tariffs and pricing structures for individual call legs in the conference, such as audio, video, digital data, or mixed. In addition, the billing system prepares a consolidated bill for dial-in and dial-out calls based on a unique ID assigned to each conference. The bill contains the description of the conference with its individual call legs grouped together for easy identification and verification by the customer, even though the individual call legs of the conference may be serviced by different long distance switching offices.