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billing increment强调
电信 тарификация звонков (A call duration measurement unit expressed in seconds. Depending on your service provider, some services are measured and billed in sixty second increments (one minute) or the billing increment may be in durations of six or even ten seconds. LyuFi)
移动和蜂窝通信 шаг тарификации (в сотовых сетях Inmar)