Hi there. I'm trying to get the call duration in seconds using ESL, but it looks like the channel variables are not being set correctly. In CHANNEL_HANGUP events, I see the following variables: 'Caller-Profile-Created-Time' => '1420586926995761', 'Caller-Channel-Created-Time' => '1420586926995761', 'Caller-Channel-Answered-Time' => '1420586929503733', 'Caller-Channel-Progress-Time' => '0', 'Caller-Channel-Progress-Media-Time' => '1420586929203735', 'Caller-Channel-Hangup-Time' => '0', I would expect to generate the duration of the call by subtracting Caller-Channel-Answered-Time from Caller-Channel-Hangup-Time, but the hangup time is 0. The actual call in this case was 45 seconds long. What can I do use Freeswitch events to compute call duration? Thanks!