This Integer32 (1..20) sets the number of consecutive OAM cells sent without receiving an acknowledgment that will cause a dual-PVC connection to be considered failed. This threshold governs how tolerant the failover logic is to transient OAM cell loss versus how quickly it declares a genuine PVC failure and switches to the backup path. For example, an admin on a noisy ATM path might raise vismVoIpDPvcRetryCnt to avoid triggering unnecessary failovers from occasional dropped OAM cells.