Aggregated billing for calls originating from separate telephone stations (12-20) may be obtained by accessing a segmentation directory (54) upon the receipt of the call at an originating switch (40.sub.1) within a telecommunications network. The segmentation directory contains a table that associates each of a plurality of common account numbers with telephone stations having telephone numbers assigned to the same subscriber. The common account associated by the segmentation directory for an incoming call is used in creation of the billing record for charges associated with the call. The charges contained in the billing records for calls associated with the common account number can be combined to yield an aggregate bill.