hpnicfVoCallHistoryFaxTxDuration 1.3.6.1.4.1.11.2.14.11.15.2.39.16.1.2.1.4

Duration of fax transmitted from this peer to voice gateway for this call. The fax utilization rate can be obtained by dividing this by hpnicfVoCallHistoryTxDuration object. The units is milliseconds.