What is "private" about a private line? NTP says they're used for selected telephones or power fail transfer equipment but what is private about them? how do they differ from non-private CO trunks that auto-terminate to a DN that I program onto a phone? Is typing YES at the PRIV prompt in LD 16 the only thing that makes it private? Is there any advantage to private line (which I know doesn't require a 9 to dial out) over a regular CO trunk auto-terminating? I'm a bit confused. Thanks.