Set up/limit: silent period bet double rings                   
  
    | Func AX | 
    2Ah | 
   
  
    | Param DX | 
    The number of samples
      during busy OFF period (110 default)
     | 
   
  
    | Return AX | 
    None | 
   
  
    | Delay | 
    None | 
   
     Set the UPPER LIMIT of the length of the longer silent period between
    double rings that are generated by some phone systems. It is not
    necessary to set this function unless ANSWER_DETECT returns a voice
    detect during such a ring tone. This parameter is set in units of 32
    msec cross count samples (32 msec = 1/32 second so 32 samples = 1
    second). The default of this parameter is 110.  (110 samples = 3 & 1/2
    seconds). The standard double ring is 1/2 second on, 1/2 second off,
    1/2 second on and 2 1/2 seconds off.  Adjust this parameter ONLY to
    adjust for phone equipment that does not support this standard. |