This read-create enumerated object selects which ringing cadence pattern -- one of ringCadenceR0 through ringCadenceR7, ringCadenceCommon, or ringCadenceSplash -- to apply when generating a test ring on a specific interface, with rows in the zhoneVoiceRingTable indexed by that interface's ifIndex. It configures which of the device's standard ring patterns is used rather than reporting any measured value. An admin or test tool sets this before triggering a ring test to select a particular cadence pattern for that port.