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It's in System Options....can't remember it's name however.
Enter a value in the range of "0" to "720" seconds. This timer operates similarly to the Call Forward No Answer timer, but controls second level rerouting. When the timer expires the call is rerouted from the first alternate to the second alternate.Note: If a value of "0" is entered, the Call Rerouting Timer value (set in the System Options form) is used.