cpmModemPort 1.3.6.1.4.1.9.10.19.1.4.3.1.8

Identification of modem resource allocated to call. This is the value of cmPortIndex from CISCO-MODEM-MGMT-MIB. This value along with cpmModemSlot uniquely identifies a modem. Value is -1 if call does not utilize a modem.