h3cCallHistoryLogicalIfIndex 1.3.6.1.4.1.43.45.1.10.2.39.16.1.1.1.7

This is the ifIndex value of the logical interface through which this call was made. For ISDN media, this would be the ifIndex of the B channel which was used for this call. If the ifIndex value is unknown, the value of this object will be zero.