I am running iCam Pro on my iPhone 5s. When it is zoomed in, my volume is all the way up on the phone and it says "volume" not "ringer".
The Sound Detection is not turned all the way up, but I did test it all the way up and no sound was picked up. I did notice that on my computer on iCamSource Pro the indicator which lights up green when motion and/or sound are detected functions perfect for the motion. For the sound no matter what noise or how loudly I make a noise, it never turns green. When I turn the sensitivity all the way up on the sound, the indicator stays green and still on my iPhone, no sound.