Hello,
i am unable to see " View Change Log" option in calls. is there any way to add Change Log option. and i need to add description box in call reschedule popup box. any solution for these. Please help.
Thanks in advance.
Iam facing same issue, ChangeLog is not populating for Calls
To track all changes to audited fields, in the Call record, you can click the View Change Log button on the Call Detail View or Edit View.
Finally i found a solution… 
Just add ‘audited’ => true in modules/Calls/vardefs.php
$dictionary[‘Call’] = array(‘table’ => ‘calls’, '‘audited’ => true, …
Then click “Quick Repair and Rebuild” in admin > Repair > Quick Repair and Rebuild
Thank You