Please add a setting to the Grasshopper iOS app to allow the app's CallKit integration to be disabled.
Being able to disable CallKit integration would make it easier to see which extension number is receiving an incoming Grasshopper call, when deciding whether to answer the call. Currently, when receiving an incoming Grasshopper call, with Wifi calling enabled (in Grasshopper > Settings > Call settings), the CallKit incoming call screen is shown rather than Grasshopper's own incoming call screen.
The CallKit incoming call screen does not show which extension the incoming call is going to, so it's not possible to determine if a call is to an individual's employee extension or to a shared department extension. It is possible to switch to the Grasshopper app while the phone is ringing, and this app shows which extension the call is to, but it is difficult to quickly switch apps when deciding how to handle the incoming call (especially for novice users).
