This object specifies the backward signal indicating that congestion occurred in the network specifically while the call was in the Group C signaling state. Like ccasBwdRSNetworkCongstInGroupB, the specific signaling-group context here, Group C rather than B, matters for diagnosing where in the call-setup sequence a congestion event happened, which helps narrow down whether it is a Group B-stage or Group C-stage bottleneck on a given trunk. A spike in this specific signal, as opposed to the Group B congestion variant, would point an admin toward whatever network resource is exercised specifically during Group C exchanges on that R2 trunk.