To get the Call Log tab on the Lead we had to create a webhook, because Perfex doesn’t allow it. 
Remember to back up the existing file before you carry out the steps below. 
If you dont know what you doing we can support you or you can get a developer to do that.

Step 1. Download a ftp client
Step 2. locate this path /application/views/admin/leads/
Step 3. overwrite the existing file the attach file “lead.php”

Done