Bypassing Call UI on MRBD

Hello,

Has anyone figured out a way to get microphone access without causing the Call UI to take over the displays? I've noticed that when I launch the app I'm developing from Xcode onto my iOS, the first instance of activating the microphone doesn't lead to the call UI taking over my screen, but subsequent instances do. This tells me there's likely a way to bypass it, but I haven't quite figured out how yet.