in a outbound campaign, some number would be failed to be reached, like no answer, hangup caused by bad voice quality, so we need to dial these numbers again, then we provide the auto recycle feature.
Max try time: the maximum time we will try, if we have dialed the number more than a number, it would not dial any more
Recycle time: when to recycle the number, 3600 means it will recycle the number after 3600 seconds if it dialed last time.
Min Duration: if the talking time is equal or less than the min duration, it will be recycled.
