How this port is currently being used: notInUse not currently in use (may become active later) octel connected to an Octel voicemail system pbx connected to a digital PBX virtual not a physical port; connected only to Cisco CallManager It should be noted that the type of a port is determined when it first becomes active. Significantly, this value will not change back to notInUse if a port is later disconnected; the relevant portTelephonyLinkState value should be read to determine whether the port is currently active.