sonusActiveCallIngressPstnChannelBitMap 1.3.6.1.4.1.2879.2.2.2.1.3.1.19

For calls originating from the PSTN (circuit) side, provides a bit map of DS0 channels on which the call is being carried. For Nx64 service calls where N is greater than 1, multiple bits will be marked in the bit map.