Useful plugin for exDialer newer than v90. It's not a standalone app. Install "exDialer" to access functions.
If your phone is running Jelly Bean or above, ROOT permission will be required at first time you enable vibrating on call connected.
This plugin performs vibrate notification when outgoing call connected or call disconnected. So you can just handle your phone and without putting it near your ear, when waiting for calls to be answered. Please adjust vibrate strength to suitable level first.
There's no guarantee that it works on all devices.