voipCdrStatFilterRtpElpasedTimeEnable 1.3.6.1.4.1.890.1.5.13.5.13.12.10.1.7

Set 0 to clear voipCdrStatFilterRtpElpasedTimeMin and voipCdrStatFilterRtpElpasedTimeMax. It will show 1 if any of them had been set before.