I also followed the same instructions. For me, most of the things he mentioned in his tutorial seem to work, except the cdr calls login features and call recordings
if I call a predefined extension, it logged the call but if I call an actual phone number vtiger will place the call and that works, but it doesn't log it
and all incoming calls are logged
And I don't know which file I need to edit to fix that problem.
I also failed to mention that issabel and vtiger crm are on different PC's