This read-write enumerated value controls the circumstances under which the calling party number is presented at the egress port of the network, choosing among user (respect the calling party's own presentation-restriction preference, i.e., honor caller-ID blocking requests), never (always suppress the calling-party number regardless of the caller's preference), or always (always present it regardless of the caller's preference). This governs calling-line-identification privacy policy at the network's edge, similar in concept to caller-ID/CLIR handling in telephony. An engineer configuring a port toward a business customer who contractually requires calling-party numbers to always be visible, overriding individual callers' privacy requests, would set svcConfigCgPtyPresentationMode to always(3).