this is my first post...I've been following this thread by some days and it's very useful for me because I've just bought a Fiio E17 to use with my Laptop and iPhone.
The following picture shows my configuration with iPhone 5 iOs 7.0.3 ( iPhone --------> lightning to camera -------> E17 -------> Headphone) :
When I play the music in my iPhone, the sounds come out from the speakers of the phone and not in the headphones.
Where did I make a mistake in my configuration?
Try inserting a USB hub (powered or passive0 between the CCK and DAC.