There are two choices, with three options each, so it is not easy to answer in a post. They are defined in the RDR Data block in the CFN and DFN settings - I have a guide to it here:
CFNA 1-(4)-15 Number of normal ringing cycles for Call Forward No
Answer (CFNA)
CFN0 1-(4)-15 Number of normal ringing cycles for CFNA, Option 0
CFN1 1-(4)-15 Number of normal ringing cycles for CFNA, Option 1
CFN2 1-(4)-15 Number of normal ringing cycles for CFNA, Option 2
Then in the phone programming you set the RCO to represent 0,1, or 2.
So if the CFN0 is set to 4 and the phone is set to RCO 0 then it will forward after 4 rings.
If you want to set it at 15 (that is the max), you might as well turn Forward No Answer off on the phone that you wish to ring longer. If you want 15, you might as well have infinity.
Also, it isn't just CFN0-3 - it is also DFN0-3 - you must do both.
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