If an app has a Live Caller ID Lookup extension and the lookup server indicates that a caller is identified and not blocked, then if the user wished to locally block that number they can do so either via the iPhone call block button, or via the app's Call Extension block list.
However there's apparently no way for the user to do the inverse. i.e. if Live Caller Id Lookup indicated that a number should be blocked, then how could a user indicate they don't want that number blocked for them?
If they added it to the Call Extension as an identified number, but live lookup is saying the number should be blocked, then what does the OS do? Give priority to the blocking instruction from the live lookup server, or give priority to the fact its in the Call Extension's Identified list?