To automatically route calls to specific users, activate the "Voice IVR" in your number settings at manage.yodel.io.
Set specific keywords and list them accordingly by adding a "," that separates them. When Yodel detects a keyword that matches to a user, it reads out the pre-defined answer and routes it to the user. If Yodel does not detect a keyword, it will keep the call ringing in your default channel and will also give a default answer that you can define in the IVR settings.
A user can deactivate notifications for incoming calls in the notifications settings but will still get notified when the call gets routed to them.