This read-write Integer32 object, in seconds (10-600), sets the ringing timer for a CAS variant, with ringing continuing until this timer expires or an off-hook is received. This timer bounds how long a call will keep ringing the far end before the system gives up, directly affecting caller experience on unanswered calls. An engineer configuring a CAS variant for a market with longer expected answer times would raise this timer above the default rather than have calls abandoned prematurely.