I was thinking about adding a speaker to a Hik DS-2CD2542 mini dome with internal microphone install. For instance, mount the speaker just below the camera and tie it all together for 2-way communication, but then I was thinking, would there be a problem with the sound from the speaker being picked up by the camera's mic? Is it possible to integrate a speaker with that camera and DS-7608NI NVR to work as a video intercom?