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                  Set number of samples to accept as ring                     
         Set the number of samples above RING_LEVEL that must be
        detected within 100ms to accept the samples as incoming ring
        energy.  It is not necessary to set this function unless RING_WAIT
        does not detect rings on your phone system.  Setting this value
        lower make ring detection more sensitive.  The default value for
        RING_LENGTH is 4. | 
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