A telecommunication service charges for voice calls entering a network over a particular time period, such as a billing period. A parameter or parameters related to the number of information units (e.g., packets, bytes or bits) used to transmit the plurality of voice calls over the network is measured. A charge for the plurality of voice calls is computed based on the one or more parameters measured. The one or more parameters may be used to compute a charge for the plurality of voice calls based on the total number of information units transmitted, average number of information units transmitted, peak information units transmitted over the billing period or some combination thereof.