This read-write DisplayString names the CAS variant table entry that defines the CAS signaling parameters used on this DS0, and it can only be set after the DS0 is configured as an endpoint. Because it cannot be changed while active connections exist, an admin planning to switch a channel's CAS signaling profile needs to ensure no calls are up on that endpoint first. For instance, migrating a batch of DS0s from one CAS signaling standard to another requires clearing calls before updating ds0CasVariantName on each channel.