Once you've connected your CRM, you can log call activities from your home screen conversations. To log a call event:
STEP #1
Find the call event, identified by the "Red Phone" icon, and tap it.

STEP #2
Click "Log To *** " for your connected CRM.

STEP #3
Press "OK" once you see the "added successfully" notification.

That's it! The call event will now appear in the contacts' "Activity History", within your CRM's.