This is the channel identifier, up to 17 characters, of the party that was called (the destination) for this specific switched virtual call, the counterpart to cdx6500StatSVCCallingChannel. Together these two objects let an admin see exactly who is talking to whom for any given active call, which is essential for troubleshooting a specific reported connection problem between two named endpoints. For example, matching a user's complaint about failing to reach a particular host against this table would confirm whether that host even shows up as a CalledChannel in any currently active call.